Audi 80/Avant (B4)
since 1991-1995 of release
Repair and car operation
+ Technical specification
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
- Anti-blocking system of brakes
Malfunctions of ABS
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
It is located in a motor compartment at the left behind: the hydraulic block is between the brake pipeline from the main brake cylinder and the brake pipeline to wheel brakes. According to commands of the electronic control unit pressure in brake system is supported to constants, decreases or created again. However this pressure cannot be higher than that is created in the main brake cylinder after pressing of a pedal of a brake by the driver. Regulation of pressure is carried out by four quickly in with an electromagnetic drive – on one on a wheel.
Sensors of frequency of rotation
Frequency of rotation of each separate wheel the sensor of frequency of rotation (defines all of their four pieces) and hands over this information to the control unit. For its part the control unit gives team to the hydraulic block.
Electronic control unit
The control unit is located at the left under back sitting and processes arriving signals from sensors of frequency of rotation. At the same time it operates the hydraulic block so that wheels were not blocked. Along with difficult processing of signals and logic following this element the control unit contains also the blocking scheme. With its help the device can check itself, distinguish external mistakes and supervise working tension. If malfunctions are established, ABS is disconnected, on the dashboard the control bulb lights up.
Three relays participate in work of ABS:
The models which have been let out to 07.92 g.
By means of the main switch located on the panel of switches on the dashboard at cars, 92 g let out till July, it is possible to disconnect ABS in order that in extreme road conditions it was possible to reach some reduction of a brake way. So, for example, if on the road the shchebenka or ice is scattered is covered with snow, when braking in front of tires