Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   The indicator of quantity of fuel
   The indicator of temperature of a cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of a cooling liquid
   Control bulb of level of a brake liquid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of the round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a headlight
   Control bulb of a pillow of safety
   Control bulb ABS
   Control bulb of a lay brake
   Control bulb of gymnastics of the accumulator
   System of the autocontrol of the car
   The ignition lock
   Check of switches
   Alarm buzzer of illumination
   Cigar Lighter
   Warmed back glass
   Check of screen wipers and windscreen
   The engine of screen wipers
   The help at malfunctions
   Gulf of a liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   The central lock
   window raiser with the electric drive
   Sliding/demountable roof with the electric drive
   Radio receiver
   The aerial on back glass
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Control bulb of a lay brake

At the included lay brake the switch closes connection with weight. Thanks to it the control bulb can light up, as at the included ignition is supplied with pressure through its other contact. At the released lay brake it dies away.

Search of malfunctions


  1. The bulb does not burn at the included manual brake: check up a safety lock (the head the Electrotechnical equipment).
  2. Dismantle a lamp накаливания and check up it (the beginning of the head).
  3. If it has not led to success bare the switch behind the lever of a lay brake, having dismantled a back part of the average console.
  4. Disconnect a wire on the switch (behind near to a manual brake) and put a socket to the bared metal.
  5. If the bulb burns, the switch is faulty
  6. The bulb does not die away at the disconnected lay brake: remove a wire on the switch of a manual brake how it is described above, but leave a socket hanging.
  7. If the bulb any more does not burn, was faulty/is wrong the switch is mounted.
  8. But if it continues to burn, the wire is wiped and will close on weight.

The switch (2) control bulbs of a lay brake is precisely behind its lever (1 – here it is shown at the dismantled average console).