165
When pressing the brake pedal proportioning valve, piston 17
(Fig. 9.24) shall move out from the housing for 1.7–2.3 mm. If the
piston has no stroke, as well as poor or excessive stroke, the valve
or its drive has malfunctions.
When inspecting the hydraulic drive pay attention to protective
boot 1, to the position of gauge plug 15 and to brake uid leaks
from it. The plug should normally be sunk into the housing orice
of the valve up to the stop. If the plug comes out and the brake
uid leaks, the valve must be replaced.
The protective boot should be tightly installed in the seat of
the piston and the housing should have no damages.
During the operation and during rear springs replacement,
adjust the force of exible arm 4 (Fig. 9.25) to the valve piston.
For adjustment do the following:
1. Install the motor vehicle on even level ground.
2. Loosen the locknut of adjusting bolt 3 and unscrew the bolt
for 2–3 turns.
Fig. 9.24. Proportioning valve:
1 — protective boot; 2 — snap ring; 3 — bush; 4 — piston O-ring; 5, 7 — piston
spring supporting washer; 6 — piston spring; 8 — weatherstrip; 9 — housing bush;
10 — cuff; 11 — lock; 12 — lock spacer; 13 — bypass valve; 14 — cup; 15 — plug;
16 — housing; 17 — piston.
Front circuit
entrance
Rear circuit
inlet
Rear circuit
outlet
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