Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
- Brake system
   Check of brake mechanisms
   Brake fluid
   Check of level of brake fluid
   Check of tightness of brake system
   Replacement of brake fluid
   Disk brake mechanisms
   Measurement of thickness of blocks of the disk mechanism
   Control of a condition of brake disks
   Replacement of blocks of disk brake mechanisms
   Drum brake mechanism
   Measurement of brake shoes of the drum mechanism
   Check of the course of a pedal of a brake
   Disk brake mechanism of back wheels
   Measurement of thickness of blocks of back disk brakes
   Check of a free wheeling of the lever of the parking brake
   Main brake cylinder
   Amplifier of brakes
   Check of the amplifier of brakes
   Regulator of brake forces
   Repair of the hydraulic drive of brakes
   Pumping of brake system
   List of malfunctions
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Pumping of brake system

Pumping of brake system in a forward support of the disk brake mechanism:
the valve of pumping (1) opens a key of 7 mm. The transparent hose (2) lowered in the prepared capacity (3) is put on the valve.

Pumping of brake system is necessary after repair of the hydraulic drive of brake system when air got to the brake cylinder or the pipeline:

PERFORMANCE ORDER

To fill a receiver with new brake fluid, and also during pumping to watch that liquid was in due time added to a certain level. Otherwise air again will get to a tank.
To remove a dustproof cap from the pumping valve (sequence of works: behind on the right; behind at the left; in front on the right; in front at the left).
To put on a transparent hose (for example, like a hose of system of washing of glasses) the valve wiped clean and to lower its free end in the capacity which is partially filled with brake fluid.
Ask the assistant to create pressure in system by pressing a brake pedal.
To open the ventilating valve on the corresponding wheel approximately on 1 — 1,5 turn and to lower pressure. The assistant thus a foot squeezes out and releases a pedal.
Again to close the valve and to create pressure.
To open the valve as it was already made.
To repeat this process until in a hose it am not visible any air bubbles any more. (At much the devastated hydraulic system to carry out pumping twice.) Thus, via the valve brake fluid and, of course, air is pumped over.
If it is not visible air bubbles any more, the assistant has to hold a pedal of a brake pressed to the full while you close the valve. To tighten carefully, differently it is possible to strip a thread!
To remove air from brakes of other wheels in the same way.