Pic. 6-23. Rear brake pressure regulator in non-working position: A - normal pressure cavity; B - adjustable pressure cavity; Р - the force transmitted by the lever 4 of the regulator drive, 1 - the regulator housing; 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 a VAZ-2121 car from pressure regulators of other cars similar in appearance, there is a groove on the bottom of the piston.
Wash parts with isopropyl alcohol or brake fluid and inspect. The surfaces of the parts should not have scratches and roughness.
Check the condition and elasticity of the spring, the length of which in the 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 the sealing ring.