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Table of Contents > Check and reset > Brake fluid

VW Tiguan 2021 Owner's Manual ➜ Brake fluid

4. Screw the cap on tight.  
Brake fluid  
5. Check the coolant level the next day.  
If the level drops below the minimum mark “min”  
again , go to a qualified specialist workshop and  
have the cooling system checked. Volkswagen  
recommends a Volkswagen dealer.  
6. If engine coolant with prescribed specifications is  
not available in an emergency, do not use any  
other coolant additives ÿ .  
WARNING  
· When adding engine coolant, do not exceed the  
upper edge of the marked area. Otherwise, when  
the temperature rises, the excess fluid will be  
expelled from the engine's cooling system and  
could cause damage.  
Fig. 244 In the engine compartment: brake fluid  
reservoir cover.  
Brake fluid absorbs moisture from the air over time.  
An excessive water content in the brake fluid causes  
damage to the brake system. The effect of water  
significantly reduces the boiling point of brake fluid. If  
the water content in the brake fluid is excessive,  
vapor bubbles can form in the brake system under  
heavy stress or under hard braking. Bubbles reduce  
braking ability, considerably increase stopping distance  
and can even cause failure of the entire braking  
system. Your safety and that of other road users  
depends on the proper functioning of the braking  
system at all times ÿ .  
· If, in an emergency, coolant with the prescribed  
specifications is not available, add only distilled  
water. Then have a qualified specialist workshop  
add the prescribed additive in the correct proportion  
as soon as possible. Volkswagen recommends a  
Volkswagen dealer.  
· Use only distilled water! All other types of water  
contain chemicals that could cause extensive  
engine corrosion damage. This could also cause  
engine failure. If you have added non-distilled  
water, immediately have all the fluid in the engine  
cooling system changed by a qualified specialist  
workshop.  
Brake fluid specifications Volkswagen  
Volkswagen recommends a Volks wagen dealer.  
has developed a special brake fluid optimized for the  
vehicle's brake system. To ensure optimal function  
of the brake system, Volkswagen expressly  
recommends the use of brake fluid in accordance  
with the VW 501 14 standard.  
· Do not add engine coolant if the expansion tank is  
completely empty!  
Air could have entered the cooling system. Do  
not continue driving and ask for help from a duly  
qualified specialized workshop.  
Before using a brake fluid, check whether the  
specifications of the brake fluid, which appear on the  
packaging, meet the requirements of the vehicle.  
Otherwise, the motor could be damaged! Volks  
wagen recommends a Volkswagen dealer.  
· When replenishing operating fluids, make sure you  
pour the correct fluids into the correct fill ports.  
Using the wrong operating fluids can cause serious  
malfunctions and engine damage.  
Brake fluid that meets the VW standard 501 14 can  
be purchased from Volkswagen dealers.  
If such a brake fluid is not available and a different,  
high-quality one has to be used, a brake fluid that  
meets the requirements of DIN ISO 4925 or the  
American standard FMVSS 116 DOT 4 CLASS can  
be used. 6.  
5 N M 0 1 2 7 6 0 A J  
Not all brake fluids that meet the requirements of  
DIN ISO 4925 or the standard is  
343  
Brake fluid  
American FMVSS 116 DOT 4 CLASS 6 have the  
too old or not suitable. If the brake fluid is old and  
the brakes are heavily stressed, vapor bubbles  
may form due to absorbed moisture. Bubbles reduce  
braking ability, greatly increase stopping distance  
and can cause failure of the entire braking system.  
same chemical composition. Some of these brake  
fluids may contain chemicals that, over time, can  
destroy or damage parts of the vehicle's brake system.  
For this reason, and in order to ensure proper  
function of the brake system in the long term,  
Volkswagen recommends using brake fluid that  
expressly complies with the VW standard 501 14.  
· Periodically have the brake system and brake fluid  
level checked or changed.  
Brake fluids in accordance with the VW 501  
14 standard meet the requirements of DIN ISO  
4925 or the American standard FMVSS 116  
· Always request that brake fluid be charged  
new.  
DOT 4 CLASS 6.  
· Make sure the correct brake fluid is used. Only  
use brake fluid that expressly complies with the  
VW 501 14 standard.  
Brake fluid level The brake  
fluid level must always be between the MIN and  
MAX marks on the brake fluid reservoir ÿ .  
The use of any other type of brake fluid or one  
that is not of a premium quality can impair the  
operation of the brakes and reduce their stopping  
ability.  
It is not always possible to check the level of the brake  
fluid exactly, because in some models a cover or  
engine components prevent seeing the level in the  
corresponding tank. If you cannot accurately  
distinguish the brake fluid level, seek help from an  
appropriately qualified specialist workshop. Volkswagen  
recommends a Volkswagen dealer.  
· If a brake fluid in accordance with the VW 501 14  
standard is not available, exceptionally use a  
high-quality brake fluid that meets the  
requirements of DIN ISO 4925 CLASS 6 or the  
American standard FMVSS 116 DOT 4 .  
WARNING  
The brake fluid level drops slightly while driving due  
to wear of the brake pads and automatic brake  
readjustment.  
Brake fluid is toxic.  
· To reduce the risk of poisoning, never use beverage  
bottles or other containers to store brake fluid.  
These containers could cause confusion and  
someone could drink their contents, even if they  
had been marked accordingly.  
brake fluid level  
The control indicator lights up red.  
The brake fluid level is too low.  
1.  
· Always store brake fluid in the original container  
tightly closed and out of the reach of children.  
Do not continue the march!  
2. Check the brake fluid level.  
If the brake fluid level is too low:  
WARNING  
1. Inform a suitably qualified specialist workshop.  
Volkswagen recommends a Volkswagen dealer.  
Brake fluid damages vehicle paint, plastic parts and  
tires if it comes in contact with them.  
2. Have the brake system checked.  
· If brake fluid spills or leaks onto vehicle parts, wipe  
it up immediately.  
Changing the brake fluid  
Have the brake fluid changed by a qualified specialist  
workshop. Volkswagen recommends a Volkswagen  
dealer. Always ask for fresh brake fluid that meets the  
required specifications to be added.  
Brake fluid can contaminate the environment.  
If any operating fluid leaks, collect it and  
dispose of it properly.  
WARNING  
If the brakes fail or their braking ability is reduced,  
the brake fluid level may be too low or the fluid  
itself may be  
344  
check and reset  
Pay attention to the following warnings and safety  
measures:  
12 volt battery  
· Before carrying out work on the battery  
Introduction to the topic  
12 volts, switch off the ignition and all electrical consumers,  
and disconnect the negative cable from this battery.  
The 12-volt battery is part of the electrical system and is  
responsible for powering the vehicle.  
· Always keep children away from the electrolyte of the 12-volt  
battery and from it.  
Only carry out work on the electrical system yourself if you are  
familiar with the necessary operations and the generally  
applicable safety measures, and if you have the appropriate tools,  
media and operating fluids. Improper work can cause serious  
injuries ÿ p. 345. Have all work carried out by a suitably qualified  
specialist workshop. Volks wagen recommends a Volkswagen  
dealer.  
· Always wear eye protection and protective gloves.  
· The battery electrolyte is very aggressive. May cause skin  
burns and blindness. When handling the 12 volt battery,  
especially protect your hands, arms and face from possible  
splashes of acid.  
· Never work near naked flames.  
shielded or sparking.  
At the end of the chapter, in the troubleshooting section, you  
will find information about warning and control lights that come  
on ÿ p. 348.  
· Avoid sparks when handling cables and electrical devices,  
as well as electrostatic discharges.  
Never cause a short circuit in the po  
those of the battery.  
12 volt battery location  
Depending on the equipment, the 12-volt battery can be mounted  
in the engine compartment or in the boot under the floor.  
Never use a 12 volt battery as it will damage  
gives. The battery may explode. If the battery is damaged,  
replace it immediately.  
Explanation of 12 volt battery warning symbols  
· Never use a frozen 12 volt battery. When the battery is  
discharged, it can freeze at temperatures close to 0 °C  
(+32 °F). replace it immediately  
Always wear eye protection!  
mind.  
· If the vehicle has a 12-volt battery in the  
Battery electrolyte is highly corrosive.  
passenger compartment, make sure that the degassing  
hose is correctly attached to said battery. It should always  
be attached to the negative pole side of the 12 volt battery.  
If there is a hole on the positive pole side of the battery, this  
hole should always be closed.  
Always wear protective gloves and eye protection!  
It is forbidden to light a fire, cause sparks, use an open  
flame or smoke!  
When charging the 12-volt battery, a highly explosive  
detonating gas mixture is produced!  
WARNING  
Ultraviolet rays can damage the battery casing.  
Always keep children away from the electrolyte of  
the 12-volt battery and from it!  
· Do not expose the 12 volt battery to prolonged direct sunlight.  
Always observe the instruction manual!  
WARNING  
The battery can freeze and be irreparably damaged as a result.  
WARNING  
Working on the 12-volt battery and electrical system can cause  
severe burns, fire, and electric shock. Before working on the  
battery, always read and take into account  
If you are not going to use the vehicle for a long time  
po, protect the 12-volt battery from frost.  
5 N M 0 1 2 7 6 0 A J  
After starting the engine with the 12 volt battery deeply  
discharged or re  
12 volt battery  
3. 4. 5  

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