Health check
With the vehicle on wheels, quickly depress and release the brake pedal to the stop. In this case, the regulator drive lever should move.
Adjustment
Adjustment of the pressure regulator must be made on an equipped vehicle, standing on wheels, with a full fuel tank. In this case, the assistant must take the driver's seat.
A more precise function check and adjustment of the pressure regulator is carried out using two high-pressure gauges with a scale of 0-160 kg / cm2 with fittings and hoses.
The control device VW 1310 used for this purpose consists of two pressure gauges, each of which has a bleed screw and whose readings can be observed from the driver's seat.
«live» several times the rear suspension.
Hang up the car.
Disconnect the hoses from the brake mechanisms of the left front and right rear wheels. Unscrew the fittings for bleeding the hydraulic drive of the brakes from the wheel cylinders and screw in the fittings of the hoses of the control pressure gauges instead.
Purge air from both hoses through pressure gauge vent screws.
Press the brake pedal several times until the pressure gauge connected to the front wheel brake shows a pressure of at least 100 kg/cm2. At the same time, the readings of the manometer. attached to the brake mechanism of the rear wheel, should be on cars up to model year 1985 within 50-63 kg / cm2, on cars from model year 1985 - 54.0-71.5 kg / cm2.
Press the brake pedal several times until the pressure gauge connected to the front wheel brake shows a pressure of at least 50 kg/cm2. At the same time, the readings of the pressure gauge connected to the brake mechanism of the rear wheel. must be on cars before model year 1985 within 31.5-39.0 kg / cm2, on cars from model year 1985 - 32.5-42.5 kg / cm2.
Adjust the tension of the pressure regulator spring by moving its end in the oval hole at the attachment point on the rear suspension beam, depending on the measurement results: with increased pressure in the rear wheel brake, loosen the spring, and vice versa.
If the measured pressure in the rear wheel brake mechanism is not within the specified limits, replace the pressure regulator.
Disconnect control pressure gauges, bleed air from hydraulic brake system.
Note. On vehicles from model year 1985, the pressure regulator can also be adjusted as follows:
- check the brake fluid level and top it up. Bleed the hydraulic drive of the brakes to remove air;
- put the car on a lift;
- raise the car so that the rear wheels are off the floor;
- move the pressure regulator drive lever to the stop to the side opposite to the direction of movement;
- loosen nut 1 (see picture);
- attach the tension spring 2 to the pressure regulator and the plastic roller so that there is no slack;
- tighten the nut 1 volume 2.5 kgf·m.
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