Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
- Brake system
   Replacement of lobbies brake колодок
   Removal and installation of disk brake mechanisms of back wheels
   Check of a thickness of a brake disk
   Removal and installation of a brake disk/support
   Adjustment of a lay brake
   Brake liquid
   Removal of air from brake system
   Removal and installation of a brake hose
   Check of the amplifier of a brake
   Removal, installation and adjustment of the switch of a stoplight
   Removal and installation of the lever and cable of a lay brake
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Removal of air from brake system


After the repair of brake system connected with its opening, air can get to system. In this case air is necessary for removing from brake system. If after pressing a pedal of a brake the effort of braking appears insufficiently strong, it also specifies in hit in air system. In this case it is necessary to eliminate негерметичность and to remove air from system.

In conditions HUNDRED air from brake system leaves, and the system is filled with a liquid, as a rule, by means of special devices.

At application of this device pressure of refuelling of system should not exceed 1 bar.

Air can be removed from system and without application of the specified devices. In this case air from system leaves качательными movements of a brake pedal. The help of the assistant is for this purpose necessary.

If it is necessary to remove air from all system, it leaves separately from each wheel cylinder. It becomes in the event that air gets into each brake cylinder. If one support is replaced or under repair only, it is enough to remove air from the corresponding cylinder.

If the tank of a brake liquid has completely appeared without a liquid (for example, owing to негерметичности in system or as a result of air removal when have forgotten to add a liquid in the empty tank) air gets into pump ABS. In this case air from system it is necessary to delete from reasons of safety in conditions HUNDRED with application of the special device. In the presence of EDS it is in addition necessary to spend adjustment with tester application. At installation of a new brake hose also it is necessary to remove air from system with application of the special device.

Order of removal of air the following:

1. A
support back right,
2. A
support back left,
3. A
support forward right,
4. A
support the forward left.

Unions for air removal should be opened cautiously not to curtail them. It is recommended 2 hours prior to отворачивания to spray unions means for rust dissolution. If unions all таки not to open, it is recommended to address on HUNDRED.
In the course of air removal watch liquid level in the tank. Level should not decrease essentially. Otherwise air can get to system. Necessarily fill in in system only a new brake liquid!

1. Remove a cap from the union of removal of air on a support. Clear the union, put on it a pure hose. Other end of a hose lower in the capacity half filled with a liquid.
2. Ask the assistant to press a pedal of a brake so much time, how many necessary for creation in pressure system that is felt on resistance on a pedal.
3. At pressure achievement press a pedal to a floor and do not release it.
4. Turn away the union of removal of air on a support approximately on a floor of a turn with the help накидного a key. Collect the flowed out liquid in capacity. As a result of opening of brake system pressure of a pedal weakens.
5. As soon as pressure of a liquid falls down, it is necessary to close the union.
6. Press some more time on педель brakes so that to restore pressure of a liquid. Press a pedal. Do not remove a foot from a pedal. Hold the union opened until then, pressure will not start to fall down. Close the union.
7. Repeat above described operation until following from system in capacity the liquid will not contain air vials.
8. After operation end remove a hose from the union and put on a cap.
9. Air from other wheel cylinders is issued similarly, observing corresponding sequence.
10. After air removal add a brake liquid in a tank to mark Mах.

Inspect reliability:

– Whether fastenings of brake hoses are reliably tightened?
– Whether the brake hose in the holder is fixed?
– Whether unions of removal of air are tightened?
– Whether it is enough in the tank of a brake liquid?
– At the working engine check up tightness of system. For this purpose press a pedal of a brake effort 200 – 300 Н (20 – 30 kg) during 10 with. The pedal should not depart. Check up on tightness all connections.

11. In summary check up work of brake system on road with неинтенсивным transport. Thus it is necessary to execute at least one strong braking with use ABS (it is felt on a pulsation of a pedal of a brake).

Watch closely thus a traffic behind.
The brake liquid should be utilised in special way. At all it is not necessary to throw out it together with a household waste. Local authorities inform drivers on places of possible recycling of dangerous materials.

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