Fig. 6-23. Rear brake pressure regulator in the non-working position: A - normal pressure cavity; B - adjustable pressure cavity; P - force transmitted by lever 4 of the regulator drive, 1 - regulator body; 2 - spacer sleeve; 3 - sealing ring; 4 - regulator drive lever; 5 - gasket; 6 - cork; 7 - rubber seal; 8 - spring plate; 9 - piston spring; 10 - piston
When assembling, which is carried out in the reverse order, lubricate all parts with brake fluid.
Warning: To distinguish the pressure regulator of the VAZ-2121 from similar-looking pressure regulators of other cars, there is a groove on the lower part of the piston.
Wash the parts with isopropyl alcohol or brake fluid and inspect. The surfaces of the parts should not have any scratches or roughness.
Check the condition and elasticity of the spring, the length of which in a free state should be 17.8 mm, and under load 68.6+7,84-3,92 H (7+0,8-0,4 kgf) - 9 mm.
Replace damaged parts, as well as the seal and O-ring.