2018-2026 Audi Q8 SUV Checking and Filling -> Brake fluid User Manual
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Checking and Filling -> Brake fluid for Your Audi Q8 SUV First Generation (2018-2026)

Checking and Filling  
Messages  
or authorized Audi Service Facility for assis-  
tance.  
The following messages may appear, depending  
on the vehicle equipment:  
If there is too much coolant in the expan-  
sion tank after adding coolant, drive to an  
authorized Audi dealer or authorized Audi  
Service Facility as soon as possible to have  
the coolant level corrected.  
 / Brakes: stop vehicle and check brake  
fluid level  
Stop the vehicle and check the brake fluid level.  
See an authorized Audi dealer or authorized Audi  
Service Facility for assistance.  
Using non-distilled water increases the risk  
of engine damage. Its chemical components  
may cause significant corrosion damage in  
the engine.  
Changing the brake fluid  
If you had to add a large amount of non-dis-  
tilled water (more than 0.5 liter), then im-  
mediately drive to an authorized Audi dealer  
or authorized Audi Service Facility to have  
the coolant changed.  
Brake fluid should be changed at regular inter-  
vals. Have the brake fluid changed by an author-  
ized Audi dealer or authorized Audi Service Facili-  
ty. The authorized Audi dealer or authorized Audi  
Service Facility will inform you of the replace-  
ment intervals.  
Brake fluid  
WARNING  
If the brake fluid level is below the MIN  
marking, it can impair the braking effect and  
driving safety, which increases the risk of an  
accident. Do not continue driving. See an au-  
thorized Audi dealer or authorized Audi  
Service Facility for assistance.  
If the brake fluid is old, bubbles may form in  
the brake system during heavy braking. This  
could impair braking performance and driv-  
ing safety, which increases the risk of an ac-  
cident.  
Fig. 166 Engine compartment: cap on brake fluid reservoir  
Observe the safety precautions ðpage 255, Gen-  
eral information.  
The brake fluid in your vehicle must meet  
the standard VW 501 14 and is available at  
an authorized Audi dealer or authorized  
Audi Service Facility. If this brake fluid is not  
available, another high-grade brake fluid of  
equivalent quality may be used, and it must  
meet the U.S. Federal Motor Vehicle Stand-  
ard (FMVSS) 116 DOT 4, Class 6.  
Checking the brake fluid level  
The brake fluid reservoir is located under a cover  
on the driver’s side.  
Park the vehicle on a level surface.  
Slide the cover that is located below the wind-  
shield wipers on the driver's side toward the  
windshield and remove the cover.  
Read the brake fluid level on the brake fluid  
reservoir ðpage 258, fig. 162. The brake fluid  
level must be between the MIN and MAX mark-  
Reusing brake fluid or using brake fluid that  
is not permitted for your vehicle will signifi-  
cantly impair the braking performance and  
can even result in a failure of the brake sys-  
tem. The manufacturer of the vehicle is not  
liable for failures or damage resulting from  
this. It will also not be covered by the war-  
ranty.  
ings ð  
.
The brake fluid level is monitored automatically.  
265  
Checking and Filling  
If the message does not turn off, drive immedi-  
ately to an authorized Audi dealer or authorized  
Audi Service Facility to have the malfunction  
corrected.  
Note  
If the brake fluid level is above the MAX  
marking, brake fluid may leak out over the  
edge of the reservoir and result in damage  
to the vehicle.  
WARNING  
Do not allow any brake fluid to come into  
contact with the vehicle paint, because it  
will corrode the paint.  
When there is an electrical system malfunc-  
tion, vehicle functions may not work and driv-  
ing stability may be limited, which increases  
the risk of an accident. Do not continue driv-  
ing and turn off the ignition. See an author-  
ized Audi dealer or authorized Audi Service Fa-  
cility for assistance.  
Electrical system  
The following messages may appear, depending  
on the vehicle equipment:  
If the  
/
or  
indicator light turns on,  
Battery  
there is a malfunction in the power supply, the  
battery, or the vehicle electrical system.  
Battery general information  
/
Electrical system: malfunction! Safely  
Because of the complex power supply, all work  
on batteries such as disconnecting, replacing,  
etc., should only be performed by an authorized  
Audi dealer or authorized Audi Service Facility  
stop vehicle  
Safely stop your vehicle, do not continue driving,  
and turn off the ignition ð . See an authorized  
Audi dealer or authorized Audi Service Facility for  
assistance.  
ð
.
Multiple batteries with different technologies  
may be installed in your vehicle:  
Electrical system: malfunction! Restart not  
possible. Please contact Service  
Vehicle battery (for example, for starting the  
engine, basic power supply) ðpage 268, Safety  
precautions  
If you turn off the ignition, you will not be able to  
restart the vehicle. Vehicle functions or driving  
stability may be limited. Drive to an authorized  
Audi dealer or authorized Audi Service Facility im-  
mediately.  
Auxiliary battery (for example, for recuperation  
or optional equipment) ðpage 268, Safety pre-  
cautions  
Not running the vehicle for long periods of  
time  
Electrical system: malfunction! Please con-  
tact Service  
The battery will gradually drain if the vehicle  
does not run for long periods of time. To ensure  
that the vehicle can still be started, the electrical  
equipment will be limited or turned off. Some  
convenience functions, such as interior lighting  
or power seat adjustment, may not be available  
under certain circumstances. The convenience  
functions will be available again when you start  
the engine.  
Turn off all electrical equipment that is not need-  
ed. If necessary, some equipment will be turned  
off automatically. Vehicle functions or driving  
stability may be limited. Drive to an authorized  
Audi dealer or authorized Audi Service Facility im-  
mediately.  
Electrical system: low battery charge. Bat-  
tery will be charged while driving  
The starting ability may be impaired.  
Even when electrical equipment is turned off, the  
equipment can still drain the battery if the vehi-  
cle is not driven for long periods of time. Deep  
draining results in a chemical reaction that  
If this message turns off after a little while, the  
vehicle battery has charged enough while driv-  
ing.  
266  

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