Table of Contents > Check engine > Brake fluid

VW Passat B8 Owner's Manual ➜ Brake fluid

· When adding engine coolant, do not go beyond the  
upper edge of the marked area ÿ fig. 235.  
Otherwise, when the temperature rises, the  
excess fluid will be expelled from the engine  
cooling system and could cause damage.  
Steam and hot engine coolant can cause severe  
· Never open the engine hood if you see or hear  
steam or coolant escaping from the engine compartment.  
Always wait until the escaping steam or coolant  
is no longer seen or heard.  
· If the system loses enough coolant, replace it only  
after the engine has completely cooled down . If  
the loss of coolant is significant, it is possible that  
there are leaks in the engine cooling system.  
Immediately go to a specialized workshop and  
have the system checked. Otherwise, the motor  
could be damaged!  
· Before carefully opening the engine hood,  
always wait for the engine to cool down  
completely. If you touch parts that are hot, you  
may get burned skin.  
· When the engine has cooled down, before  
opening the engine hood note the following:  
· Do not add coolant if the expansion tank is  
completely empty! Air could have entered the  
cooling system. Stop walking and request the help  
of specialized personnel. Otherwise, the motor  
could be damaged!  
— Engage the electronic parking brake and  
place the selector lever in position P or the  
gear lever in neutral.  
· 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.  
— Switch off the ignition and, if necessary,  
remove the key from the ignition lock.  
— Always keep children away from the  
engine compartment and never leave them unattended.  
· When the engine is hot, its cooling system is  
under pressure. Never open the engine coolant  
expansion tank cap when the engine is hot.  
Doing so could cause coolant to splatter and  
cause serious burns and other injuries.  
Brake fluid  
— Turn the cover slowly and very carefully anti-  
clockwise while applying light pressure on it.  
— Always protect your face, hands and  
warm coolant or steam arms with a large,  
thick rag.  
· When replenishing operating fluids, avoid  
getting them on engine components or the  
exhaust system. These liquids could cause a  
fire. Under certain circumstances, the ethylene  
glycol in engine coolant can ignite.  
Fig. 237 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  
· Use only distilled water! All other types of water  
damage to the brake system. The effect of water  
contain chemicals that could cause extensive  
significantly reduces the boiling point of brake fluid.  
engine corrosion damage. This could also cause  
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 capacity, increase considera  
engine failure. If you have added non-distilled  
water, immediately have all the fluid in the engine  
cooling system changed by a specialized workshop.  
3 G 0 0 1 2 7 6 0 A H  
Brake fluid  
braking distance and can even cause the 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 .  
brake fluid level  
The control indicator lights up red.  
The brake fluid level is too low.  
- Do not continue the march!  
— Check the brake fluid level.  
If the brake fluid level is too low:  
Brake fluid specifications Volkswagen  
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.  
— Inform a specialized workshop.  
— Have the brake system checked.  
Changing the brake fluid  
Have the brake fluid changed by a specialist  
workshop. Volkswagen recommends going to a  
Volkswagen dealer for this. Always request fresh brake  
fluid that meets the required specifications.  
Before using a brake fluid, it must be checked whether  
its specifications, which appear on the packaging,  
meet the requirements of the vehicle.  
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 can be used.  
If the brakes fail or their braking ability is reduced,  
the brake fluid level may be too low or the fluid  
itself is too old or not adequate.  
FMVSS 116 DOT 4 CLASS 6.  
· Have the brake system and brake fluid level  
checked regularly!  
Not all brake fluids that meet the requirements of  
DIN ISO 4925 or the American standard FMVSS 116  
DOT 4 CLASS 6 have the same chemical composition.  
· Have the brake fluid changed regularly.  
Some of these brake fluids may contain chemicals  
that, over time, can destroy or damage parts of the  
vehicle's brake system.  
· If the brake fluid is old and the brakes are heavily  
stressed, vapor bubbles may form. Bubbles  
reduce braking ability, considerably increase  
stopping distance and can cause failure of the  
entire braking 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.  
· Be sure to use the correct brake fluid. Only use  
brake fluid that expressly complies with the VW  
501 14 standard.  
Brake fluids in accordance with the VW 501  
14 standard meet the requirements of DIN ISO  
4925 or the American standard FMVSS 116  
· The use of any other type of brake fluid or one  
that is not of the highest quality can impair the  
operation of the brakes and reduce their braking  
DOT 4 CLASS 6.  
Brake fluid level The brake  
fluid level must always be between the MIN and  
MAX marks on the brake fluid reservoir and above  
the MIN ÿ mark.  
· If a brake fluid conforming to the VW 501 14  
standard is not available, exceptionally a high-  
quality brake fluid can be used that meets the  
requirements of DIN ISO 4925 CLASS 6 or the  
American standard FMVSS 116 DOT 4.  
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 distinguish the level  
of the brake fluid exactly, ask for the help of specialized  
The brake fluid used must be  
Brake fluid is toxic.  
The brake fluid level drops slightly while driving due  
to wear of the brake pads and automatic brake  
· To reduce the risk of poisoning, never use beverage  
bottles or other containers  
check and reset  
to store brake fluid. These containers could cause  
It is forbidden to light a fire, cause sparks,  
use an open flame or smoke!  
confusion and someone could drink their contents, even  
if they had been marked accordingly.  
When charging the 12-volt battery, a highly  
explosive detonating gas mixture is produced!  
· Always store brake fluid in the original container tightly closed  
and out of the reach of children.  
Always keep children away from the  
electrolyte of the 12-volt battery and from it!  
Always take the instruction manual into  
Brake fluid damages vehicle paint, plastic parts and tires if it  
comes in contact with them. If brake fluid is spilled or leaked  
onto vehicle parts, wipe it up immediately.  
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 observe the following warnings  
and safety precautions:  
Brake fluid can contaminate the environment. If any  
operating fluid leaks, collect it and dispose of it properly.  
· Before carrying out work on the battery  
12 volts, switch off the ignition and all electrical consumers,  
and disconnect the negative cable from this battery.  
12 volt battery  
Introduction to the topic  
· Always keep children away from the electrolyte of the 12-  
volt battery and from it.  
The 12-volt battery is part of the electrical system and is  
responsible for powering the vehicle.  
· 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.  
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 lead to  
serious injuries ÿ . Have all work carried out by a specialized  
· Do not smoke while carrying out the work and never carry  
it out near naked flames or sparks.  
workshop. Volkswagen reco  
mmends going to a Volkswagen  
dealer for this.  
· Avoid sparks from electrostatic discharges, as well as  
when handling cables and electrical devices.  
At the end of the chapter, in the troubleshooting section, you  
will find information about warning and control lights that come  
on ÿ p. 333.  
· Never short-circuit the battery poles.  
· Never use damaged 12 volt batteries. They could explode.  
If the 12 volt battery is damaged, replace it immediately.  
12 volt battery location  
Depending on the equipment, the 12-volt battery can be located  
in the engine compartment or in the trunk or behind a cover.  
· Never use a frozen 12 volt battery. When the battery is  
discharged, it can freeze at temperatures close to 0 °C  
(+32 °F). If the 12 volt battery is frozen, replace it  
Explanation of 12 volt battery warning symbols  
Always wear eye protection!  
Battery electrolyte is highly corrosive.  
Always wear protective gloves and eye  
· If the vehicle has a 12-volt battery in the boot, make sure  
that the degassing hose is correctly attached to the battery.  
3 G 0 0 1 2 7 6 0 A H  
12 volt battery  

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