Proportioning Valve
WARNING: This page is about a different car, the 1991 Plymouth Laser and 1991 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Under normal conditions, input and output pressures increase gradually (but not equally) as brake pedal is pressed. At a certain point, output pressure begins to decrease in relation to input pressure. This point is referred to as "split point".
- Connect 2 pressure gauges, one to input side and one to output side of proportioning valve. Bleed air from brake line and pressure gauges.
- Gradually press brake pedal and observe pressure gauges. If split point occurs at 491-561 psi (AWD vehicles), or 561-633 psi (FWD vehicles), go to next step. If split point does not occur at specified pressure, replace proportioning valve.
- Gradually press brake pedal until input pressure is as specified in the INPUT-TO-OUTPUT PRESSURE COMPARISON table. If output pressure is as specified, proportioning valve is okay. If output pressure is not as specified, replace proportioning valve.
INPUT-TO-OUTPUT PRESSURE COMPARISON (1)
| Application | Input Pressure | Output Pressure | ||
|---|---|---|---|---|
| AWD Vehicles | 1095 psi | 661-732 psi | ||
| FWD Vehicles | 1163 psi | 732-804 psi | ||
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