Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of cooling liquid
   Control bulb of level of brake fluid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of a round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb of ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a driving beam
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of a battery charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   The warmed back glass
   Check of screen wipers and windscreen washers
   Engine of screen wipers
   The help at malfunctions
   The gulf of liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/removable roof with the electric drive
   Radio receiver
   The antenna on back glass
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Control bulb of level of brake fluid

The control bulb of brake system at inclusion of ignition blinks when carrying out functional control, at the working engine it has to go out.

If it blinks more long or burns during the movement, it is necessary to stop and check the level of brake fluid at once. Possibly, tightness in one of brake contours is lost, and it thereof failed that you in addition feel on the extended pedal course (adjustment of a pedal of a brake and information on this subject in the head Tormoza).

 Councils: The lowered level of brake fluid can be a consequence of strongly worn-out brake shoes. Reason: brake pistons in process of wear start more from cylinders and release a place for brake fluid which level if to follow logic, in a tank goes down.

If the control bulb of level of brake fluid lights up, you have to measure thickness of blocks if do not find other defect. In this case do not add brake fluid in a tank, and replace blocks. For this purpose it is necessary to wring out pistons in brake supports. Consequence: level of brake fluid again will rise up to the nominal size. Mistakenly filled in brake fluid will pour out from a tank.

Search of malfunctions


  1. Check of a control bulb.
  2. If at the working engine the control bulb burns though liquid level in a broad tank is above a mark of "MIN", for the sake of experience disconnect the socket on the sensor of level of liquid of a broad tank.
  3. If the bulb goes out, the sensor in a broad tank is faulty – replace a tank.