VW Tiguan Service & Owner's Manuals
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Table of Contents > Brakes hydraulics > Brake servo and brake master cylinder

VW Tiguan Brake System ➜ Brake servo and brake master cylinder

Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
3
Brake servo and brake master cylin‐  
der  
β‡’ o3.1 verview – brake servo/brake master cylinder”, page 96  
β‡’ a3.2 nd installing brake servo”, page 100  
β‡’ a3.3 nd installing brake master cylinder”, page 106  
β‡’ a3.4 nd installing brake fluid level warning contactF34”, page  
120  
3.1  
Assembly overview – brake ser‐  
vo/brake master cylinder  
β‡’ o3.1.1 verview – brake servo/brake master cylinder, left-hand  
drive vehicles”, page 96  
β‡’ o3.1.2 verview – brake servo/brake master cylinder, right-  
hand drive vehicles”, page 98  
3.1.1  
Assembly overview – brake servo/brake master cylinder, left-hand drive  
vehicles  
96  
Rep. gr.47 - Brakes - hydraulics  
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Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
1 - Warning contact for brake  
fluid level -F34-  
❑ Removing and instal‐  
ling β‡’ a3.4 nd installing  
brake fluid level warn‐  
ing contactF34”, page  
120  
2 - Cap  
3 - Brake fluid reservoir  
4 - Locking pin  
5 - Supply hose  
❑ For vehicles with man‐  
ual gearbox  
6 - Seal  
❑ For brake servo  
❑ Check for damage  
7 - Mounting bracket with  
brake pedal  
❑ Assembly overview β‡’  
page 74  
❑ Removing and instal‐  
ling β‡’ page 77  
8 - Nut  
❑ Renew after each re‐  
moval  
❑ 25 Nm  
9 - Brake servo  
❑ Removing and instal‐  
ling β‡’ page 100  
The following electrical com‐  
ponents are integrated in the  
brake servo:  
♦ Brake pedal position sender -G100-  
♦ Brake pedal position sender 2 -G836-  
♦ Voltage supply sender 1 -G730-  
♦ Voltage supply sender 2 -G731-  
♦ Brake servo current sensor -G822-  
♦ Brake servo temperature sender 1 -G838-  
♦ Brake servo temperature sender 2 -G839-  
♦ Motor position sender for brake servo -G840-  
♦ Brake servo control unit -J539-  
♦ Electromechanical brake servo motor -V548-  
10 - Seal  
❑ Renew  
11 - Brake line  
❑ Brake master cylinder/primary piston circuit to hydraulic unit  
❑ With thread M12 x 1  
❑ 14 Nm  
3. Brake servo and brake master cylinder  
97  
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Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
12 - Brake master cylinder  
❑ Cannot be repaired. If faulty, renew complete.  
❑ Removing and installing β‡’ page 106  
13 - Nut  
❑ Renew after removal  
❑ 22 Nm  
14 - Plug  
❑ Moisten with brake fluid before installing  
15 - Brake line  
❑ Brake master cylinder/secondary piston circuit to hydraulic unit  
❑ With thread M12 x 1  
❑ 14 Nm  
3.1.2  
Assembly overview – brake servo/brake master cylinder, right-hand drive  
vehicles  
Brake master cylinders and brake servos can be renewed inde‐  
pendently of each other.  
98  
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Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
1 - Warning contact for brake  
fluid level -F34-  
2 - Cap  
3 - Brake fluid reservoir  
4 - Locking pin  
5 - Supply hose  
❑ For vehicles with man‐  
ual gearbox  
6 - Brake servo  
❑ Removing and instal‐  
ling β‡’ page 103  
The following electrical com‐  
ponents are integrated in the  
brake servo:  
♦ Brake pedal position send‐  
er -G100-  
♦ Brake pedal position send‐  
er 2 -G836-  
♦ Voltage supply sender 1 -  
G730-  
♦ Voltage supply sender 2 -  
G731-  
♦ Brake servo current sen‐  
sor -G822-  
♦ Brake servo temperature  
sender 1 -G838-  
♦ Brake servo temperature  
sender 2 -G839-  
♦ Motor position sender for  
brake servo -G840-  
♦ Brake servo control unit -  
J539-  
♦ Electromechanical brake servo motor -V548-  
7 - Seal  
❑ For brake servo  
❑ Renew  
❑ Bonded (only when originally assembled at factory)  
❑ Bonded joint at brake servo and bulkhead does not have to be renewed  
8 - Mounting bracket with brake pedal  
❑ Assembly overview β‡’ page 76  
❑ Removing and installing brake pedal β‡’ page 82  
❑ Removing and installing mounting bracket β‡’ page 78  
9 - Nut  
❑ Renew after each removal.  
❑ 25 Nm  
10 - Seal  
❑ Renew  
11 - Bolt  
❑ 8 Nm  
3. Brake servo and brake master cylinder  
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Brake system - Edition 10.2020  
12 - Heat shield  
13 - Brake line  
❑ Brake master cylinder/primary piston circuit to hydraulic unit  
❑ With thread M12 x 1  
❑ 14 Nm  
14 - Nut  
❑ Renew after each removal.  
❑ 22 Nm  
15 - Brake master cylinder  
❑ Cannot be repaired. If faulty, renew complete.  
❑ Removing and installing β‡’ page 112  
16 - Brake line  
❑ Brake master cylinder/secondary piston circuit to hydraulic unit  
❑ With thread M12 x 1  
❑ 14 Nm  
17 - Plug  
❑ Moisten with brake fluid before installing  
3.2  
Removing and installing brake servo  
β‡’ a3.2.1 nd installing brake servo, left-hand drive vehicles”,  
page 100  
β‡’ a3.2.2 nd installing brake servo, right-hand drive vehicles”,  
page 103  
3.2.1  
Removing and installing brake servo,  
left-hand drive vehicles  
Special tools and workshop equipment required  
♦ Torque wrench -V.A.G 1410-  
100  
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Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
♦ Hot air blower, e.g. hot air blower -VAS 1978/14A-  
Overview of fitting locations β‡’ Fig. β€œβ€œLocation of anti-lock brake  
system on left-hand drive vehicle:β€β€œ, page 10 :  
Removing:  
– Remove brake master cylinder β‡’ page 106 .  
Vehicles with hybrid drive:  
– Detach high-voltage cables from bracket and lay aside  
β‡’ Rep. gr. 93; High-voltage cables.  
– Remove bracket for high-voltage cables on the gearbox  
β‡’ Rep. gr. 93; High-voltage cables.  
Vehicles with 12 V battery in luggage compartment  
– Remove bolt -5-.  
– Unclip wiring harness -2- -3-.  
– Release potential distributor -1- on bracket -arrow-.  
– Release and pull off connector -4-.  
– Move potential distributor -1- to one side.  
Vehicles with diesel engine:  
– Remove air intake pipe β‡’ Rep. gr. 21; Charge air system;  
Removing and installing air intake pipe.  
Vehicles with dual clutch gearbox:  
– Remove selector cable and cable support bracket from gear‐  
box β‡’ Rep. gr. 34; Selector mechanism; Assembly overview  
- selector mechanism.  
Continued for all vehicles:  
– Separate brake pedal from brake servo β‡’ page 80 .  
– Unscrew nuts -3 and 4- from brake servo.  
3. Brake servo and brake master cylinder  
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– Carefully pull brake servo off plenum chamber bulkhead.  
– Carefully remove brake servo from the vehicle.  
– Remove adhesive residue -arrows- from brake servo -2- and  
plenum chamber bulkhead -1-.  
– To do so, apply gentle heat from hot air blower to the adhe‐  
sive residue and pull it off.  
– Thoroughly clean surfaces.  
Installing:  
Install in reverse order of removal, observing the following:  
NOTICE  
The brake servo is given the additional bonded joint only dur‐  
ing factory assembly.  
The adhesive bond between the brake servo and the bulk‐  
head does not need to be renewed, but the seal does.  
– Renew gasket between brake servo and bulkhead β‡’ page  
96 .  
– Carefully insert brake servo and tighten nuts hand-tight.  
– When assembling brake master cylinder with brake servo,  
make sure push rod is properly positioned in brake master  
cylinder.  
102  
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Brake system - Edition 10.2020  
– When joining brake master cylinder to brake servo, ensure  
that seal β‡’ Item 10 (page 97) is properly seated.  
– Ensure that seals β‡’ Item 14 (page 98) are correctly seated  
in brake master cylinder.  
– Coat sealing plugs with brake fluid before pressing brake  
fluid reservoir into brake master cylinder.  
– Connect brake pedal to brake servo β‡’ page 81 .  
– Code brake servo control unit -J539- β‡’ Vehicle diagnostic  
tester.  
– Perform basic setting for electromechanical brake servo  
β‡’ Vehicle diagnostic tester.  
Torque settings  
♦ β‡’ o3.1.1 verview – brake servo/brake master cylinder, left-  
hand drive vehicles”, page 96  
♦ β‡’ Rep. gr. 93; Power and control electronics for electric  
drive  
♦ β‡’ Rep. gr. 93; High-voltage cables  
♦ β‡’ Electrical system; Rep. gr. 27; Battery; Disconnecting and  
reconnecting battery  
♦ β‡’ General body repairs, interior; Rep. gr. 68; Compartments  
and covers; Assembly overview – Dash panel cover on driv‐  
er side  
♦ β‡’ Running gear, axles, steering; Rep. gr. 48; Steering col‐  
umn; Assembly overview - steering column  
♦ β‡’ Heating, air conditioning; Rep. gr. 87; Air duct; Assembly  
overview – air duct and air distribution in passenger com‐  
partment  
♦ β‡’ Rep. gr. 34; Selector mechanism; Assembly overview –  
selector mechanism  
3.2.2  
Removing and installing brake servo,  
right-hand drive vehicles  
♦ Torque wrench -V.A.G 1410-  
3. Brake servo and brake master cylinder  
103  
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Brake system - Edition 10.2020  
♦ Hot air blower, e.g. hot air blower -VAS 1978/14A-  
Overview of fitting locations β‡’ Fig. β€œβ€œLocation of anti-lock brake  
system on right-hand drive vehicle:β€β€œ, page 10 :  
Vehicles with hybrid drive:  
– Observe safety precautions when working on the high-volt‐  
age system β‡’ page 1 .  
– Observe the risk category of the high-voltage system β‡’ Rep.  
gr. 00; Risk category of the high-voltage system.  
Danger to life from high voltage  
The high-voltage system is under high voltage. Damage to high-  
voltage components can result in severe or fatal injury from  
electric shock.  
– Perform visual check of high-voltage components and high-  
voltage cables.  
– Never use cutting or forming tools, or any other sharp-edged  
tools.  
– Never use heat sources such as welding, brazing, soldering,  
hot air or thermal bonding equipment.  
Vehicles with emission control module:  
– Remove emission control module β‡’ Rep. gr. 26; Emission  
control; Removing and installing emission control module.  
Vehicles with particulate filter:  
– Remove particulate filter β‡’ Rep. gr. 26; Emission control;  
Removing and installing particulate filter.  
Vehicles with auxiliary heater:  
– Remove coolant pipes on bulkhead β‡’ Auxiliary heater, sup‐  
plementary heating system; Rep. gr. 82; Coolant circuit with  
auxiliary heater/supplementary heating system.  
Vehicles with catalytic converter  
– Remove catalytic converter β‡’ Rep. gr. 26; Emission control;  
Removing and installing catalytic converter.  
Continued for all vehicles:  
– Disconnect battery β‡’ Electrical system; Rep. gr. 27; Battery;  
Disconnecting and connecting battery.  
– Separate brake pedal from brake servo β‡’ page 80 .  
– Remove brake master cylinder β‡’ a3.3.2 nd installing brake  
master cylinder, right-hand drive vehicles”, page 112 .  
104  
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Brake system - Edition 10.2020  
– Remove nuts -arrows- from mounting bracket.  
– Pull brake servo off bulkhead, applying force to separate  
bonded joint.  
NOTICE  
Risk of damage to the plenum chamber bulkhead due to im‐  
proper separation of the bonded joint.  
– Never lever the brake servo off the plenum chamber bulk‐  
head to separate the bonded joint.  
– Lay brake servo to side.  
– Remove brake servo downwards.  
– Carefully remove brake servo from the vehicle.  
– Remove adhesive residue -arrows- from brake servo -2- and  
plenum chamber bulkhead -1-.  
– To do so, apply gentle heat from hot air blower to the adhe‐  
sive residue and pull it off.  
– Remove adhesive residue from brake servo and plenum  
chamber bulkhead.  
– To do so, apply gentle heat from hot air blower to the adhe‐  
sive residue and pull it off.  
– Thoroughly clean surfaces.  
3. Brake servo and brake master cylinder  
105  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
Installing:  
Install in reverse order of removal, observing the following:  
NOTICE  
The brake servo is given the additional bonded joint only dur‐  
ing factory assembly.  
The adhesive bond between the brake servo and the bulk‐  
head does not need to be renewed, but the seal does.  
– Renew gasket between brake servo and bulkhead β‡’ Item 7  
(page 99) .  
– Carefully insert brake servo and tighten nuts hand-tight.  
– When assembling brake master cylinder with brake servo,  
make sure push rod is properly positioned in brake master  
cylinder.  
– When joining brake master cylinder to brake servo, make  
sure seal β‡’ Item 10 (page 99) is properly seated.  
– Ensure that seals β‡’ Item 17 (page 100) are correctly seated  
in brake master cylinder.  
– Coat sealing plugs with brake fluid before pressing brake  
fluid reservoir into brake master cylinder.  
Continued for all vehicles:  
– Code brake servo control unit -J539- β‡’ Vehicle diagnostic  
tester.  
– Perform basic setting for electromechanical brake servo  
β‡’ Vehicle diagnostic tester.  
Torque settings  
♦ β‡’ o3.1.2 verview – brake servo/brake master cylinder, right-  
hand drive vehicles”, page 98  
♦ β‡’ General body repairs, interior; Rep. gr. 68; Compartments  
and covers; Assembly overview – Dash panel cover on driv‐  
er side  
♦ β‡’ Heating, air conditioning; Rep. gr. 87; Air duct; Assembly  
overview – air duct and air distribution in passenger com‐  
partment  
3.3  
Removing and installing brake master  
cylinder  
β‡’ a3.3.1 nd installing brake master cylinder, left-hand drive ve‐  
hicles”, page 106  
β‡’ a3.3.2 nd installing brake master cylinder, right-hand drive  
vehicles”, page 112  
3.3.1  
Removing and installing brake master  
cylinder, left-hand drive vehicles  
Special tools and workshop equipment required  
106  
Rep. gr.47 - Brakes - hydraulics  
theMANUALS.org  
 
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
♦ Brake filling and bleeding equipment -VAS 6860-  
♦ Engine bung set -VAS 6122-  
♦ Torque wrench -V.A.G 1410-  
♦ Ring spanner insert set AF 11 -V.A.G 1331/2-  
3. Brake servo and brake master cylinder  
107  
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Brake system - Edition 10.2020  
♦ Sealing plug repair kit -1H0 698 311 A-  
♦ Sealing plugs, assembly part no. 5Q0 698 311  
♦ Hose clamps, up to 25 mm -3094-  
Overview of fitting locations β‡’ Fig. β€œβ€œLocation of anti-lock brake  
system on left-hand drive vehicle:β€β€œ, page 10 :  
Removing  
– Disconnect battery β‡’ Electrical system; Rep. gr. 27; Battery;  
Disconnecting and connecting battery.  
Vehicles with hybrid drive:  
Danger to life from high voltage  
The high-voltage system is under high voltage. Damage to high-  
voltage components can result in severe or fatal injury from  
electric shock.  
108  
Rep. gr.47 - Brakes - hydraulics  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
– Perform visual check of high-voltage components and high-  
voltage cables.  
– Never use cutting or forming tools, or any other sharp-edged  
tools.  
– Never use heat sources such as welding, brazing, soldering,  
hot air or thermal bonding equipment.  
– Remove power and control electronics for electric drive -  
JX1- β‡’ Rep. gr. 93; Power and control electronics for electric  
drive; Removing and installing power and control electronics  
for electric drive.  
– Remove bracket for power and control electronics for electric  
drive -JX1- β‡’ Electric motor (270, LS2); Rep. gr. 93; Power  
and control electronics for electric drive; Removing and in‐  
stalling bracket for power and control electronics for electric  
drive.  
Vehicles with turbocharger:  
– Remove air filter housing β‡’ Rep. gr. 23; Air filter; Assembly  
overview - air filter housing.  
– Remove air intake hose between turbocharger and air filter  
housing β‡’ Rep. gr. 24; Air filter; Assembly overview - air  
filter housing.  
– Remove turbocharger connection β‡’ Rep. gr. 21; Turbo‐  
charger; Removing and installing turbocharger connection.  
Vehicles with 12 V battery in engine compartment  
– Remove battery β‡’ Electrical system; Rep. gr. 27; Battery;  
Removing and installing battery.  
– Remove battery tray β‡’ Electrical system; Rep. gr. 27; Bat‐  
tery tray; Removing and installing battery tray.  
Vehicles with 12 V battery in luggage compartment  
– Remove air filter carrier β‡’ Rep. gr. 23; Air filter; Assembly  
overview - air filter housing.  
Vehicles with diesel engine:  
– If present, free off wiring harness -3- from brake line -5-.  
3. Brake servo and brake master cylinder  
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– Lay control unit for NOx sender -J583- to one side.  
– Unclip line retainer -4- on brake line -5-.  
– Unscrew bolt -2- and remove air intake pipe -1-.  
Continued for all vehicles:  
– Place sufficient lint-free cloths in area of engine, subframe  
and gearbox.  
– Extract as much brake fluid as possible from brake fluid res‐  
ervoir -1- using brake filling and bleeding equipment -VAS  
6860- -A-.  
Vehicles with manual gearbox:  
– Pull off supply hose -4- on clutch master cylinder -3- and  
brake fluid reservoir -1-.  
– Seal supply hose -4- for clutch master cylinder using engine  
bung set -VAS 6122- or hose clamps to 25 mm -3094-.  
110  
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Brake system - Edition 10.2020  
Continued for all vehicles:  
– Release and disconnect connector -4- for brake fluid level  
warning contact -F34- from brake fluid reservoir.  
– Unclip wiring harness -8- on brake master cylinder -1-.  
– Unscrew brake lines -3- and -5- from brake master cylinder  
-1-.  
– Seal threaded holes immediately using sealing plugs -1H0  
698 311 A- or sealing plugs with assembly part number 5Q0  
698 311.  
– Seal brake lines using plugs from repair set part number  
1H0 698 311 A or bung set for engine -VAS 6122-. If neces‐  
sary, fit dust caps from bleeder valves on brake lines.  
– Unscrew nuts -7-.  
– Release and pull off electrical connectors -2- and -6-.  
– Carefully take brake master cylinder -1- out of brake servo.  
Installing  
Install in reverse order of removal, observing the following:  
– When assembling brake master cylinder with brake servo,  
make sure push rod is properly positioned in brake master  
cylinder.  
– When assembling brake master cylinder with brake servo,  
make sure seal β‡’ Item 10 (page 97) is seated correctly.  
– Fit sealing plugs onto brake fluid reservoir β‡’ Item 14 (page  
98) .  
– Coat sealing plugs with brake fluid before pressing brake  
fluid reservoir into brake master cylinder.  
– Bleed brake system β‡’ page 126 .  
– Subsequently bleeding the brake system β‡’ page 127 .  
3. Brake servo and brake master cylinder  
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Vehicles with manual gearbox:  
– Check seals -2- for damage and renew supply hose -4- if  
necessary.  
– Make sure that seals -2- engage correctly in supply hose -4-.  
– Fit supply hose -4- on clutch master cylinder -3- and brake  
fluid reservoir -1-.  
– Bleed clutch mechanism β‡’ Rep. gr. 30; Clutch mechanism;  
Bleeding clutch mechanism.  
Continued for all vehicles:  
– Perform basic setting for electromechanical brake servo  
β‡’ Vehicle diagnostic tester.  
Torque settings  
♦ β‡’ o3.1.1 verview – brake servo/brake master cylinder, left-  
hand drive vehicles”, page 96  
♦ β‡’ Heating, air conditioning; Rep. gr. 87; Air duct; Assembly  
overview – air duct and air distribution in passenger com‐  
partment  
♦ β‡’ Rep. gr. 93; Power and control electronics for electric  
drive  
♦ β‡’ Electrical system; Rep. gr. 27; Battery; Assembly overview  
- battery  
♦ β‡’ Rep. gr. 21; Turbocharger; Assembly overview – turbo‐  
charger  
♦ β‡’ Rep. gr. 23; Air filter; Assembly overview - air filter hous‐  
ing  
♦ β‡’ Rep. gr. 24; Air filter; Assembly overview - air filter hous‐  
ing  
3.3.2  
Removing and installing brake master  
cylinder, right-hand drive vehicles  
Special tools and workshop equipment required  
112  
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theMANUALS.org  
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Brake system - Edition 10.2020  
♦ Brake filling and bleeding equipment -VAS 6860-  
♦ Engine bung set -VAS 6122-  
♦ Torque wrench -V.A.G 1410-  
♦ Ring spanner insert set AF 11 -V.A.G 1331/2-  
3. Brake servo and brake master cylinder  
113  
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Brake system - Edition 10.2020  
♦ Sealing plug repair kit -1H0 698 311 A-  
♦ Sealing plugs, assembly part no. 5Q0 698 311  
♦ Hose clamps, up to 25 mm -3094-  
♦ Socket Torx T 30 -T10405-  
114  
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Brake system - Edition 10.2020  
Overview of fitting locations β‡’ Fig. β€œβ€œLocation of anti-lock brake  
system on right-hand drive vehicle:β€β€œ, page 10 :  
Removing:  
– If fitted, remove engine cover panel β‡’ Rep. gr. 10; Engine  
cover panel; Removing and installing engine cover panel.  
– Disconnect battery β‡’ Electrical system; Rep. gr. 27; Battery;  
Disconnecting and connecting battery.  
Vehicles with hybrid drive:  
– Observe safety precautions when working on the high-volt‐  
age system β‡’ page 1 .  
– Observe the risk category of the high-voltage system β‡’ Rep.  
gr. 00; Risk category of the high-voltage system.  
Vehicles with diesel engine:  
– Remove lines for injector for reducing agent -N474- at top of  
toothed belt cover β‡’ Rep. gr. 15; Toothed belt drive; Remov‐  
ing and installing toothed belt cover.  
– Remove injector for reducing agent -N474- on exhaust gas  
cleaning module and lay aside with lines attached β‡’ Rep.  
gr. 26; SCR system (Selective Catalytic Reduction); Remov‐  
ing and installing injector for reducing agent.  
– Remove differential pressure sender -G505- and exhaust  
gas pressure sensor 1 -G450- from cylinder head β‡’ Rep.  
gr. 23; Senders and sensors; Removing and installing differ‐  
ential pressure sender G505.  
– Remove exhaust gas temperature sender 3 -G495- β‡’ Rep.  
gr. 26; Removing and installing exhaust gas temperature  
sender 3.  
– Unbolt fuel filter, and place it on engine with fuel lines con‐  
nected β‡’ Rep. gr. 20; Fuel filter; Removing and installing  
fuel filter.  
Vehicles with bi-turbo diesel engine  
– Release and pull off connector -2- on coolant expansion  
tank.  
– Unclip, release and pull off connector -4-.  
– Unclip retainer for fuel lines on coolant expansion tank  
-arrow-.  
– Using a screwdriver, release catches -6-.  
– Place coolant expansion tank -1- on engine.  
3. Brake servo and brake master cylinder  
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Continued for all vehicles:  
– Disconnect electrical connector -1-.  
– Disconnect bracket -2- with fuel hoses.  
– Remove coolant hoses from engine. To do this, open retain‐  
ers.  
– Use a screwdriver to release fasteners -arrow- and place  
coolant expansion tank on engine.  
– Disconnect fuel lines -1- and -2- and lay to side. Disconnect  
plug-in connectors β‡’ Rep. gr. 20; Plug-in connectors; Dis‐  
connecting plug-in connectors.  
– Unclip air conditioning line in the area of the brake servo  
β‡’ Heating, air conditioning; Rep. gr. 87; Refrigerant circuit;  
System overview - Refrigerant circuit.  
– Unclip refrigerant lines -1- on longitudinal member on right  
side. To do this, open retainers -arrows-.  
– Release and disconnect connector -3- from brake fluid level  
warning contact -F34- at brake fluid reservoir -1-.  
116  
Rep. gr.47 - Brakes - hydraulics  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
– Unclip wiring harness -4- on brake master cylinder.  
– Release and pull off electrical connectors -2- and -5-.  
Vehicle with heat shield:  
– Remove bolt -4-.  
– Detach heat shield -3- on brake fluid reservoir -1- from top  
mountings -2- and remove.  
3. Brake servo and brake master cylinder  
117  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
Continued for all vehicles:  
– Lay out sufficient lint free clothes in area of engine and  
subframe.  
– Extract as much brake fluid as possible from brake fluid res‐  
ervoir -1- using brake filling and bleeding equipment -VAS  
6860- -A-.  
Vehicles with manual gearbox:  
– Pull off supply hose -4- on clutch master cylinder -3- and  
brake fluid reservoir -1-.  
– Seal supply hose -4- for clutch master cylinder using engine  
bung set -VAS 6122- or hose clamps to 25 mm -3094-.  
118  
Rep. gr.47 - Brakes - hydraulics  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
Continued for all vehicles:  
– Unscrew brake lines -1- and -3- from brake master cylinder  
-2-.  
– Seal threaded holes immediately using sealing plugs -1H0  
698 311 A- or sealing plugs with assembly part number 5Q0  
698 311.  
– Seal brake lines using plugs from repair set part number  
1H0 698 311 A or bung set for engine -VAS 6122-. As ap‐  
propriate, fit dust caps from bleeder screws onto brake line.  
– Unscrew nuts -2-.  
– Remove brake master cylinder -1- from brake booster.  
Installing:  
Install in reverse order of removal, observing the following:  
– When assembling brake master cylinder with brake servo,  
make sure push rod is properly positioned in brake master  
cylinder.  
– When joining brake master cylinder to brake servo, make  
sure seal is properly seated.  
– Bleed brake system β‡’ page 126 .  
– Subsequently bleeding the brake system β‡’ page 127 .  
3. Brake servo and brake master cylinder  
119  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
Vehicles with manual gearbox:  
– Check seals -2- for damage and renew if necessary.  
– Make sure that seals -2- engage correctly in supply hose -4-.  
– Connect supply hose -4-.  
– Bleed clutch mechanism β‡’ Rep. gr. 30; Clutch mechanism;  
Bleeding clutch mechanism.  
Continued for all vehicles:  
– Perform basic setting for electromechanical brake servo  
β‡’ Vehicle diagnostic tester.  
Torque settings  
♦ β‡’ o3.1.2 verview – brake servo/brake master cylinder, right-  
hand drive vehicles”, page 98  
♦ β‡’ Heating, air conditioning; Rep. gr. 87; Air duct; Assembly  
overview – air duct and air distribution in passenger com‐  
partment  
♦ β‡’ Rep. gr. 15; Toothed belt drive; Assembly overview -  
toothed belt guard  
♦ β‡’ Rep. gr. 26; SCR system (Selective Catalytic Reduction);  
Assembly overview - injector for reducing agent  
♦ β‡’ Rep. gr. 23; Lambda probe; Exploded view - Lambda  
probe  
♦ β‡’ Rep. gr. 20; Fuel filter; Assembly overview - fuel filter  
♦ β‡’ Heating, air conditioning; Rep. gr. 87; Overview of fitting  
locations - air conditioning system  
3.4  
Removing and installing brake fluid lev‐  
el warning contact -F34-  
Removing:  
– Push locking element -2- on retaining tab -arrow- of brake  
fluid reservoir inwards.  
120  
Rep. gr.47 - Brakes - hydraulics  
theMANUALS.org  
Tiguan 2021 ➀, Tiguan RUS 2021 ➀  
Brake system - Edition 10.2020  
– Pull out brake fluid level warning contact -F34- -3- in direc‐  
tion of -arrow-.  
Installing:  
Push warning contact for brake fluid level -F34- -3- into brake  
fluid reservoir and engage.  
3. Brake servo and brake master cylinder  
121  
theMANUALS.org  

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