Audi A4 Owners & Service Manuals

Audi A4: Brake fluid

Checking and Filling
Fig. 161 Motor compartment: cap on brake fluid reservoir

Observe the safety precautions General information.

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.
  • Lift the cover fig. 158 at both openings and remove it.
  • Read the brake fluid level on the brake fluid reservoir fig. 158. The brake fluid level must be between the MIN and MAX markings.

The brake fluid level is monitored automatically.

Messages

The following messages may appear depending on the vehicle equipment:

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.

Changing the brake fluid

Brake fluid should be changed at regular intervals.

Have the brake fluid changed by an authorized Audi dealer or authorized Audi Service Facility.

The authorized Audi dealer or authorized Audi Service Facility will inform you of the replacement intervals.

WARNING

  • If the brake fluid level is below the MIN marking, it can impair the braking effect and driving safety, which increase the risk of an accident. Do not continue driving. See an authorized 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 driving safety, which increases the risk of an accident.
  • 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 Standard (FMVSS) 116 DOT 4, Class 6.

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.
  • Do not allow any brake fluid to come into contact with the vehicle paint, because it will corrode the paint.

Electrical system

The following messages may appear depending on the vehicle equipment:

If the or indicator light turns on, there is a malfunction in the power supply, the battery, or the vehicle electrical system.

Electrical system: malfunction! Safely stop vehicle

Do not continue driving and switch the ignition off. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

Electrical system: malfunction! Restart not possible. Please contact Service

If you switch the ignition off, 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 immediately.

Electrical system: malfunction! Please contact Service

Switch off all electrical equipment that is not needed. If necessary, some equipment will be switched off automatically. Vehicle functions or driving stability may be limited. Drive to an authorized Audi dealer or authorized Audi Service Facility immediately.

Electrical system: low battery charge. Battery will be charged while driving

The starting ability may be impaired.

  • If this message turns off after a little while, the vehicle battery has charged enough while driving.
  • If the message does not turn off, drive immediately to an authorized Audi dealer or authorized Audi Service Facility to have the malfunction repaired.

WARNING

When there is an electrical system malfunction, vehicle functions may not work and driving stability may be limited, which increases the risk of an accident. Do not continue driving and switch the ignition off. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

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