Proportioning Valve
CAUTION:
Check rear brake pressure 2 seconds after front brake pressure reaches specified value. Disconnect ABS actuator harness connector.
NOTE:
Carefully monitor master cylinder fluid level while testing proportioning valve.
- Quest uses a Load Sensing Proportioning Valve (LSPV). To test LSPV, ensure vehicle is in unladen condition. Have one person sit in driver's seat. To stabilize suspension deflection, have one person sit in rear of vehicle and then exit vehicle slowly.
- Adjust LSPV spring length to approximately 6.0" (152.5 mm). Attach one pressure gauge to front brake bleeder and another pressure gauge to rear brake bleeder.
- Bleed air from front and rear gauges. Depress brake pedal until front brake pressure reading is achieved. Check rear brake pressure. See PROPORTIONING VALVE PRESSURE SPECIFICATIONS table.
- If pressure readings are not as specified, adjust spring bracket. Repeat test. If pressure readings are still not as specified, replace LSPV and repeat test.
PROPORTIONING VALVE PRESSURE SPECIFICATIONS
| Application | Front Brake Pressure psi (kg/cm2 ) | Rear Brake Pressure psi (kg/cm2 ) |
|---|---|---|
| Quest | 853 (60) | 478-825 (34-58) |
| Quest | 1706 (120) | 813-1064 (57-75) |