Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
3
Control unit and hydraulic unit
⇒ a3.2 nd installing ABS control unitJ104 and ABS hydraulic
unitN55”, page 21
⇒ b3.3 rake lines to hydraulic unit”, page 36
⇒ c3.4 ontrol unit from hydraulic unit”, page 39
⇒ c3.5 ontrol unit to hydraulic unit”, page 40
3.1
Assembly overview – control unit and
hydraulic unit
⇒ o3.1.2 verview – control unit and hydraulic unit, right-hand
drive”, page 18
3.1.1
Assembly overview – control unit and hydraulic unit, left-hand drive vehi‐
cles
16
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
1 - ABS control unit -J104-
and ABS hydraulic unit -N55-
❑ Removing and instal‐
ling ⇒ page 21
2 - Brake line
❑ To rear right brake cali‐
per
❑ Identification: 5.25 mm
diameter and union
screw with M10 × 1
thread
❑ With standard tool:
14 Nm
❑ With special tools VAS
6854, VAG 1410/7 and
VAG 1410/6: 12 Nm
3 - Brake line
❑ To front left brake cali‐
per
❑ Identification: 5.25 mm
diameter and union
screw with M10 × 1
thread
❑ With standard tool:
14 Nm
❑ With special tools VAS
6854, VAG 1410/7 and
VAG 1410/6: 12 Nm
4 - Brake line
❑ To front right brake cali‐
per
❑ Identification: 5.25 mm
diameter and union
screw with M10 × 1
thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
5 - Brake line
❑ To rear left brake caliper
❑ Identification: 5.25 mm diameter and union screw with M10 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
6 - Brake line
❑ Leading to brake master cylinder/secondary piston circuit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
7 - Brake line
❑ Leading to brake master cylinder/primary piston circuit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
8 - Brake servo and brake master cylinder
3. Control unit and hydraulic unit
17
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
❑ Assembly overview ⇒ page 96
❑ Checking brake servo ⇒ Vehicle diagnostic tester
❑ Removing and installing ⇒ page 100
9 - Brake line
❑ Brake master cylinder/primary piston circuit to hydraulic unit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
10 - Brake line
❑ Brake master cylinder/secondary piston circuit to hydraulic unit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
11 - Heat insulation
12 - Nut
❑ 20 Nm
13 - Bracket
14 - Stud
15 - Rubber damper
16 - Bolt
❑ 8 Nm
17 - Bracket
3.1.2
Assembly overview – control unit and hydraulic unit, right-hand drive
18
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
1 - ABS hydraulic unit -N55-
with ABS control unit -J104-
❑ Overview of fitting loca‐
tions ⇒ page 10
❑ Assembly overview ⇒
page 18
❑ Removing and instal‐
ling ⇒ page 30
❑ Separating ABS control
unit -J104- from ABS
hydraulic unit -N55- ⇒
page 39
❑ Attaching ABS control
unit -J104- to ABS hy‐
draulic unit -N55- ⇒
page 40
❑ Connecting brake line
⇒ page 38
2 - Brake line
❑ Brake master cylin‐
der/secondary piston
circuit to hydraulic unit
❑ Identification: 6 mm
diameter and union
screw with M12 × 1
thread
❑ Repairing brake lines ⇒
page 122
❑ 14 Nm
3 - Brake line
❑ Brake master cylin‐
der/primary piston cir‐
cuit to hydraulic unit
❑ Identification: 6 mm
diameter and union
screw with M12 × 1 thread
❑ Repairing brake lines ⇒ page 122
❑ 14 Nm
4 - Brake line
❑ To rear right brake caliper
❑ Identification: 5.25 mm diameter and union screw with M10 × 1 thread
❑ Repairing brake lines ⇒ page 122
❑ 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
5 - Brake line
❑ To front left brake caliper
❑ Identification: 5.25 mm diameter and union screw with M10 × 1 thread
❑ Repairing brake lines ⇒ page 122
❑ 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
6 - Brake line
❑ To front right brake caliper
❑ Identification: 5.25 mm diameter and union screw with M10 × 1 thread
❑ Repairing brake lines ⇒ page 122
3. Control unit and hydraulic unit
19
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
❑ 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
7 - Brake line
❑ To rear left brake caliper
❑ Identification: 5.25 mm diameter and union screw with M10 × 1 thread
❑ Repairing brake lines ⇒ page 122
❑ 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
8 - Bracket
❑ Check for secure seating after installing.
9 - Stud
10 - Bracket
11 - Nut
❑ Qty. 2
❑ 20 Nm
12 - Rubber damper
❑ Qty. 3
13 - Bolt
❑ Qty. 2
❑ 8 Nm
14 - Brake servo and brake master cylinder
❑ Assembly overview ⇒ page 98
❑ Checking brake servo ⇒ Vehicle diagnostic tester
❑ Removing and installing ⇒ page 103
❑ Removing and installing brake master cylinder ⇒ page 112
15 - Brake line
❑ Brake master cylinder/primary piston circuit to hydraulic unit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
16 - Brake line
❑ Brake master cylinder/secondary piston circuit to hydraulic unit
❑ Identification: 6 mm diameter and union screw with M12 × 1 thread
❑ With standard tool: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
20
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
3.2
Removing and installing ABS control
unit -J104- and ABS hydraulic unit -
N55-
⇒ a3.2.2 nd installing control unit and hydraulic unit, right-hand
drive vehicles”, page 30
3.2.1
Removing and installing ABS control
unit -J104-/ABS hydraulic unit -N55-,
LHD vehicles
Special tools and workshop equipment required
♦ Ring spanner insert AF 11 -V.A.G 1410/6-
♦ Universal joint -V.A.G 1410/7-
♦ Torque wrench -VAS 6854-
3. Control unit and hydraulic unit
21
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
♦ Brake pedal depressor -V.A.G 1869/2-
♦ Assembly tool -V.A.G 1410/8-
♦ Engine support -T10533-
Sealing plugs, assembly part no. 5Q0 698 311
1 - Sealing plug M10
2 - Sealing plug M12
22
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
Removing
Overview of fitting locations ⇒ Fig. ““Location of anti-lock brake
system on left-hand drive vehicle:”“, page 10 :
NOTICE
Risk of damage to brake lines if bent.
– Never excessively bend the brake lines in the area of the
hydraulic unit.
– If ABS control unit -J104- is renewed, use ⇒ Vehicle diag‐
nostic tester.
– Disconnect battery ⇒ Electrical system; Rep. gr. 27; Battery;
Disconnecting and connecting battery.
– Remove engine cover ⇒ Rep. gr. 10; Engine cover; Remov‐
ing and installing engine cover.
– Remove noise insulation ⇒ General body repairs, exterior;
Rep. gr. 66; Noise insulation; Assembly overview - noise
insulation.
Vehicles with hybrid drive:
– Remove catalytic converter ⇒ Rep. gr. 26; Emission control;
Removing and installing catalytic converter.
Vehicles with diesel engine:
– Remove pressure differential sender -G505- and exhaust
gas pressure sensor 1 -G450- from cylinder head cover
⇒ Rep. gr. 23; Senders and sensors; Removing and instal‐
ling pressure differential sender -G505-.
– If fitted, detach exhaust gas pressure sensor 1 -G450- from
cylinder head cover ⇒ Rep. gr. 23; Senders and sensors;
Removing and installing exhaust gas pressure sensor 1 -
G450-.
– Remove exhaust gas temperature sender 3 -G495- ⇒ Rep.
gr. 26; Removing and installing exhaust gas temperature
sender 3 G495.
– Remove injector for reducing agent -N474- on exhaust gas
cleaning module and place on right with lines still attached
⇒ Rep. gr. 26; SCR system (Selective Catalytic Reduction);
Removing and installing injector for reducing agent.
– Release and pull off connector -1- for oil level and oil tem‐
perature sender -G266-.
3. Control unit and hydraulic unit
23
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– If fitted, release and pull off connector -2- on auxiliary pump
for heating -V488-.
– Remove front exhaust pipe on emission control module
⇒ Rep. gr. 26; Exhaust pipes/silencers; Removing and in‐
stalling front exhaust pipe.
– Remove pendulum support ⇒ Rep. gr. 10; Assembly mount‐
ings; Removing and installing pendulum support.
Vehicle with diesel engine and four-wheel drive
– Unbolt propshaft from bevel box at front ⇒ Propshaft and
rear final drive; Rep. gr. 39; Propshaft; Assembly overview -
propshaft, and lay it to one side.
Vehicles with bi-turbo diesel engine
– Unbolt fuel filter, and place it on engine with fuel lines con‐
nected ⇒ Rep. gr. 20; Fuel filter; Removing and installing
fuel filter.
– 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.
24
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
Continued for all vehicles with diesel engine:
– Fit engine support -T10533- as shown in illustration and
tighten bolts by hand.
♦ Bolt -3- = original pendulum support bolt
♦ Screw an M8 × 30 mm bolt -1- with a washer -2- into threa‐
ded hole of noise insulation.
♦ -A- thin end
♦ -B- thick end
NOTICE
For all-wheel drive vehicles, fit a longer bolt into the pendulum
support to serve as a spacer between the gearbox and the
engine support.
Use the front hole in the aluminium section to do so.
– To start the second bolt, push the engine forwards slightly by
hand.
– Push engine with engine support -T10533- forwards.
Continued for all vehicles:
– On vehicles with heat shield, remove heat shield -1-.
3. Control unit and hydraulic unit
25
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Press down retainer catch -arrow A-.
– Release electrical connector -arrow B-.
– Pull off electrical connector -1-.
– Apply brake pedal depressor -V.A.G 1869/2-.
– Connect hose of bleeder bottle -1- to bleeder valve of front
left brake caliper.
– Open bleeder valve.
– Connect hose of bleeder bottle -1- to bleeder valve of rear
left brake caliper.
26
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Open bleeder valve.
– Depress brake pedal at least 60 mm using brake pedal de‐
pressor -V.A.G 1869/2-.
– Close front left and rear left bleeder valve.
– Do not remove brake pedal depressor -V.A.G 1869/2-.
NOTICE
Ensure no brake fluid gets onto contacts.
– Pull cover off bulkhead and unclip brake lines.
– First, mark both brake lines from brake master cylinder, and
unscrew them from hydraulic unit.
– Seal threaded holes immediately using sealing plugs from
the assembly kit, part no. 5Q0 698 311.
– Mark, unscrew and seal threaded holes of remaining brake
lines (brake calipers).
– Pull hydraulic unit together with control unit upwards out of
dampers -arrow-.
– Unbolt bracket from hydraulic unit -arrows- in vehicle.
3. Control unit and hydraulic unit
27
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Remove hydraulic unit.
Installing
Install in reverse order of removal, observing the following:
NOTICE
Remove sealing plugs from new hydraulic unit only when the
corresponding brake line is going to be fitted.
If the sealing plugs are removed from the hydraulic unit, brake
fluid can escape, and it can then no longer be guaranteed that
the unit is sufficiently filled and bled.
Ensure that rubber dampers of retainer are not pressed out of
bracket when installing. After installation, check hydraulic unit
for firm seating to avoid malfunctions.
– Before installing bracket of ABS hydraulic unit -N55- into
bracket, spray rubber dampers with silicone lubricant -D 007
000 A2-.
– Using assembly tool -V.A.G 1410/8-, carefully fit brake lines.
28
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
Tightening sequence of brake lines:
– Remove brake pedal actuator -V.A.G 1869/2-.
– Bleed brake system ⇒ page 126 .
– If ABS control unit -J104- was renewed, use ⇒ Vehicle diag‐
nostic tester.
Torque settings
Assembling special tools for tightening brake lines
♦ ⇒ o3.1.1 verview – control unit and hydraulic unit, left-hand
drive vehicles”, page 16
♦ ⇒ Rep. gr. 26; Emission control system; Assembly overview
- emission control system
♦ ⇒ Rep. gr. 26; Exhaust pipes/silencers; Assembly overview -
front exhaust pipe
♦ ⇒ Rep. gr. 26; Exhaust gas temperature control; Assembly
overview - exhaust gas temperature control
♦ ⇒ Rep. gr. 10; Assembly mountings; Assembly overview -
assembly mountings
♦ ⇒ Rep. gr. 20; Fuel filter; Assembly overview - fuel filter
♦ ⇒ Rep. gr. 26; SCR system (Selective Catalytic Reduction);
Assembly overview - injector for reducing agent
♦ ⇒ Electrical system; Rep. gr. 27; Battery; Assembly overview
- battery
♦ ⇒ General body repairs, exterior; Rep. gr. 66; Noise insula‐
tion; Assembly overview - noise insulation.
♦ ⇒ Propshaft and rear final drive; Rep. gr. 39; Propshaft;
Assembly overview - propshaft
♦ Front bleeder valves ⇒ o1.1 verview – front brake caliper”,
page 86
3. Control unit and hydraulic unit
29
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
♦ Rear bleeder valves ⇒ o2.1 verview – rear brake caliper”,
page 91
3.2.2
Removing and installing control unit
and hydraulic unit, right-hand drive ve‐
hicles
Special tools and workshop equipment required
♦ Ring spanner insert AF 11 -V.A.G 1410/6-
♦ Universal joint -V.A.G 1410/7-
♦ Torque wrench -VAS 6854-
30
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
♦ Brake pedal depressor -V.A.G 1869/2-
♦ Assembly tool -V.A.G 1410/8-
♦ Engine support -T10533-
Sealing plugs, assembly part no. 5Q0 698 311
1 - Sealing plug M10
2 - Sealing plug M12
3. Control unit and hydraulic unit
31
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
Overview of fitting locations ⇒ Fig. ““Location of anti-lock brake
system on right-hand drive vehicle:”“, page 10 :
Removing
NOTICE
Risk of damage to brake lines if bent.
– Never excessively bend the brake lines in the area of the
hydraulic unit.
– If ABS control unit -J104- was renewed, perform function
0003 - Renew control unit (commissioning). Use
⇒ Vehicle diagnostic tester for this.
Vehicles with 12 V battery in engine compartment
– Remove battery ⇒ Electrical system; Rep. gr. 27; Battery;
Removing and installing battery.
– Remove battery tray ⇒ 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 ⇒ Rep. gr. 24; Air filter; Removing
and installing air filter housing.
Vehicles with hybrid drive:
– Observe safety precautions when working on the high-volt‐
age system ⇒ page 1 .
– Observe the risk category of the high-voltage system ⇒ Rep.
gr. 00; Risk category of the high-voltage system.
DANGER
Danger to life due to high voltage.
Severe or fatal injury from electric shock.
– The high-voltage system must be de-energised by a suita‐
bly qualified technician.
– De-energise high-voltage system now ⇒ Electric drive; Rep.
gr. 93; De-energising high-voltage system.
– Disconnect battery ⇒ Electrical system; Rep. gr. 27; Battery;
Disconnecting and connecting battery.
Continued for all vehicles:
– Press down retainer catch -arrow A-.
– Release electrical connector -arrow B-.
– Pull off electrical connector -1-.
32
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Apply brake pedal depressor -V.A.G 1869/2-.
– Connect hose of bleeder bottle -1- to bleeder valve of front
left brake caliper.
– Open bleeder valve.
– Connect hose of bleeder bottle -1- to bleeder valve of rear
left brake caliper.
– Open bleeder valve.
– Depress brake pedal at least 60 mm using brake pedal de‐
pressor -V.A.G 1869/2-.
– Close front left and rear left bleeder valve.
– Do not remove brake pedal depressor -V.A.G 1869/2-.
– Place sufficiently lint-free cloths under ABS control unit -
J104- and ABS hydraulic unit -N55-.
NOTICE
Make sure no brake fluid gets onto electrical contacts on ABS
control unit -J104-.
3. Control unit and hydraulic unit
33
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Unclip brake lines from plenum chamber bulkhead.
– First, mark the two brake lines -A- and -B- coming from
brake master cylinder.
– Unscrew both brake lines -A- and -B- from ABS hydraulic
unit -N55-.
– Seal threaded holes immediately using sealing plugs
5Q0 698 311.
– Mark and unscrew remaining brake lines (brake calipers).
Seal threaded holes -2-.
– Pull off ABS hydraulic unit -N55- -1- together with bracket -2-
in -direction of arrow-.
– The rubber dampers -arrows- will be pulled off the studs of
bracket -3- while doing so.
– Guide hydraulic unit out of vehicle.
Installing
Install in reverse order of removal, observing the following:
34
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
NOTICE
Remove sealing plugs from new hydraulic unit only when the
corresponding brake line is going to be fitted.
If the sealing plugs are removed from the hydraulic unit, brake
fluid can escape, and it can then no longer be guaranteed that
the unit is sufficiently filled and bled.
Ensure that rubber dampers of retainer are not pressed out of
bracket when installing. After installation, check hydraulic unit
for firm seating to avoid malfunctions.
– Before installing bracket of ABS hydraulic unit -N55- into
bracket, spray rubber dampers with silicone lubricant -D 007
000 A2-.
– Using assembly tool -V.A.G 1410/8-, carefully fit brake lines.
Tightening sequence of brake lines:
– First, attach and tighten brake lines in sequence -4- to -1-.
– Then, tighten attach and tighten brake lines in sequence -A-
to -B-.
– Remove brake pedal actuator -V.A.G 1869/2-.
– Bleed brake system ⇒ page 126 .
– If ABS control unit -J104- was renewed, perform function
0003 - Renew control unit (commissioning). Use
⇒ Vehicle diagnostic tester for this.
Torque settings
Assembling special tools for tightening brake lines
3. Control unit and hydraulic unit
35
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
♦ ⇒ o3.1.2 verview – control unit and hydraulic unit, right-hand
drive”, page 18
♦ Battery ⇒ Electrical system; Rep. gr. 27; Battery; Assembly
overview - battery
♦ Noise insulation ⇒ General body repairs, exterior; Rep.
gr. 66; Noise insulation; Assembly overview - noise insula‐
tion
♦ ⇒ Rep. gr. 23; Air filter; Assembly overview - air filter hous‐
ing
♦ Front bleeder valves ⇒ o1.1 verview – front brake caliper”,
page 86
♦ Rear bleeder valves ⇒ o2.1 verview – rear brake caliper”,
page 91
3.3
Connecting brake lines to hydraulic
unit
⇒ b3.3.2 rake lines to hydraulic unit, right-hand drive vehicles”,
page 38
3.3.1
Connecting brake lines to hydraulic
unit, left-hand drive vehicles
On hydraulic unit:
1 - Hydraulic unit to rear right brake caliper
- Identification: 5.25 mm diameter and union screw with short
M12 × 1 thread
2 - From hydraulic unit to front left brake caliper
36
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
- Identification: 5.25 mm diameter and union screw with M10 ×
1 thread
3 - From hydraulic unit to front right brake caliper.
- Identification: 5.25 mm diameter and union screw with short
M12 × 1 thread
4 - From hydraulic unit to rear left brake caliper
- Identification: 5.25 mm diameter and union screw with M10 ×
1 thread
5 - From hydraulic unit to secondary piston circuit of brake
master cylinder.
- Identification: 6 mm diameter and union screw with M12 × 1
thread
6 - From hydraulic unit to primary piston circuit of brake master
cylinder.
- Identification: 6 mm diameter and union screw with M12 × 1
thread
Torque settings
♦ ⇒ o3.1 verview – control unit and hydraulic unit”, page 16
♦ ⇒ a3.2 nd installing ABS control unitJ104 and ABS hydraulic
unitN55”, page 21
On tandem brake master cylinder:
1 - Secondary piston circuit of brake master cylinder to ABS
hydraulic unit -N55-.
2 - Brake servo and brake master cylinder
3 - Primary piston circuit of brake master cylinder to ABS hy‐
draulic unit -N55-.
Abbildung oben - Vehicles without biturbo diesel engine
Abbildung unten - Vehicles with biturbo diesel engine
Torque settings
♦ ⇒ o3.1 verview – control unit and hydraulic unit”, page 16
♦ ⇒ o3.1 verview – brake servo/brake master cylinder”, page
96
3. Control unit and hydraulic unit
37
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
3.3.2
Connecting brake lines to hydraulic
unit, right-hand drive vehicles
On hydraulic unit:
1 - From hydraulic unit to rear left brake caliper
- Identification: 5.25 mm diameter and union screw with M10 ×
1 thread
2 - From hydraulic unit to front right brake caliper.
- Identification: 5.25 mm diameter and union screw with short
M12 × 1 thread
3 - From hydraulic unit to front left brake caliper
- Identification: 5.25 mm diameter and union screw with M10 ×
1 thread
4 - Hydraulic unit to rear right brake caliper
- Identification: 5.25 mm diameter and union screw with short
M12 × 1 thread
A - From hydraulic unit to primary piston circuit of brake master
cylinder.
- Identification: 6 mm diameter and union screw with M12 × 1
thread
B - From hydraulic unit to secondary piston circuit of brake
master cylinder.
- Identification: 6 mm diameter and union screw with M12 × 1
thread
On brake master cylinder:
1 - Between brake master cylinder and brake servo
2 - Brake master cylinder/primary piston circuit to hydraulic unit
38
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
3 - Brake master cylinder/secondary piston circuit to hydraulic
unit
Torque settings
♦ ⇒ o3.1.2 verview – control unit and hydraulic unit, right-hand
drive”, page 18
♦ ⇒ o3.1.2 verview – brake servo/brake master cylinder, right-
hand drive vehicles”, page 98
3.4
Separating control unit from hydraulic
unit
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
♦ Torx insert T25
♦ If a control unit is defective, detach the control unit from the
hydraulic unit. Renew only the control unit.
♦ If the hydraulic unit is defective, the hydraulic unit must be
renewed together with the control unit.
♦ To separate the control unit from the hydraulic unit, the ESP
unit must be removed first.
NOTICE
Risk of damage to hydraulic unit caused by removal of the
return flow pump.
– Never detach the return flow pump from the hydraulic unit.
NOTICE
Risk of irreparable damage to control unit caused by electro‐
static charge and dirt.
– Discharge any electrostatic electricity: touch an ESD work‐
place (earth yourself).
– Protect interior of control unit from moisture and dirt.
This electrostatic charge can cause malfunctions if you touch
electric components.
– Before working on electric components, touch an earthed
object, ESD workplace -VAS 6613-. Do not directly touch
connector contacts or electronic components.
– Lay down hydraulic unit together with control unit on ESD
workplace -VAS 6613-.
– Unscrew the 3 Torx bolts from control unit and lay them
aside immediately (to avoid interchanging with the new Torx
bolts).
3. Control unit and hydraulic unit
39
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
– Set hydraulic unit with control unit facing upwards on ESD
workplace -VAS 6613-.
– Taking care not to tilt control unit, pull it off hydraulic unit.
– Cover control unit solenoids with a lint-free cloth.
– Check cleanliness of hydraulic unit sealing surface; clean
with methylated spirits and a lint-free cloth if necessary.
Hydraulic unit sealing surface must not be worked with a file,
metal scraper, sandpaper or similar.
If hydraulic unit sealing surface is damaged (e.g. scoring,
scratches), hydraulic unit must be renewed together with control
unit.
The seal of the control unit may not be pulled out or raised.
The seal of the control unit cannot be renewed.
3.5
Fitting control unit to hydraulic unit
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
♦ Torque screwdriver -V.A.G 1624-
40
Rep. gr.45 - Anti-lock brake system
Tiguan 2021 ➤, Tiguan RUS 2021 ➤
Brake system - Edition 10.2020
♦ Torx insert T25
NOTICE
Severe shocks (e.g. dropping, impact) may destroy the control
unit. Control unit must not then be used.
The threads of the hydraulic unit for securing the control unit
must not be recut. If the thread is damaged, e.g. bolts difficult
to turn in by hand or cannot be tightened to the specified
torque. Renew the hydraulic unit.
A new control unit may be mounted on an existing hydraulic
unit max. three times to guarantee impermeability of the elas‐
tic seal.
A control unit which has already been operated in a vehicle
must not be installed a second time.
•
Clean surfaces before assembling.
– Place control unit on hydraulic unit without tilting it.
– Tighten hydraulic unit and control unit alternately in 2 stages
to specified torque using new Torx bolts provided.
Torque settings
♦ Tighten new Torx bolts alternately in 2 stages
♦ Stage 1: preliminary tightening torque: 1 Nm to 1.5 Nm (to
allow seal to settle).
♦ Stage 2: final specified torque: 2.5 Nm.
♦ ⇒ o3.1 verview – control unit and hydraulic unit”, page 16
3. Control unit and hydraulic unit
41
2024 VW Tiguan Owner's Manual
