Checking the performance of the pressure regulator (VAZ-2101)

To check, place the car on a lift or inspection pit and clean the pressure regulator and protective cover from dirt. Carefully remove the protective cover from the pressure regulator, remove any remaining grease, and clean the torsion-piston connection.

Press the brake pedal with a force of 70-80 kgf and simultaneously observe the protruding part of the pressure regulator piston. If the piston moves relative to the pressure regulator body by 0.5-0.9 mm, while twisting the torsion lever, then the pressure regulator is operational. Continue pressing the pedal 2-3 times to fully verify the functionality of the pressure regulator. If the piston remains motionless when pressing the pedal, this indicates corrosion between the piston and the body 4 (see fig. 140), the pressure regulator is replaced with a new one.

Having made sure that the pressure regulator is working properly and that there is no fluid leakage between the piston and the regulator body, apply a layer of DT-1 grease to the axle and the protruding part of the piston and, having placed 5-6 g of this grease in the rubber boot, install it in place.

The article is taken from an online resource (vazbook.ru)