Rear brake fluid pressure regulator (Audi 80 B4)

In AUDI 80 cars with front-wheel drive, the brake fluid pressure regulator in the rear brakes is located on the bracket in front of the rear suspension. It regulates the brake fluid pressure on the pistons of the wheel cylinders of the rear wheels. This adjustment is made depending on the load of the car. When the car is fully loaded, the pressure on the pistons increases. At the same time, the rear suspension is only slightly relieved during braking. If there are only one or two people in the car, the pressure decreases and the rear shock absorber struts seem to lift the car body.

The pressure regulator receives information about the load on the struts from the spring, which connects it to the rear suspension (see illustration 9.0).



An assistant is needed to check the operation of the pressure regulator. The car does not need to be put on jack stands.

Press the brake pedal all the way down and release it sharply. The pressure regulator lever should move.

For a more accurate check of the pressure regulator, special devices are required.

In AUDI 89 quattro cars, the pressure regulator is located in the engine compartment in front of the ABS unit. The pressure regulator prevents the rear wheels from locking by preventing the brake fluid pressure from rising to a dangerous level.

[The article was copied from the website: AUDImanual]