Eagle Wagon L6-258 4.2L (1984)
Vacuum Brake Booster: Testing and Inspection
Decreasing Brake Pedal Travel
If a decreasing brake pedal is encountered, the power brake unit may be binding internally. To test the power brake unit for this condition proceed as
follows:
1. Place transmission shift lever in Neutral and START engine.
2. Increase engine speed to approximately 1500 rpm, close throttle and completely depress brake pedal.
3. Slowly release brake pedal and stop engine.
4. Remove vacuum check valve and hose from power brake unit. Observe brake pedal for backward movement.
5. If brake pedal moves backward, power brake unit has internal binding, and must be replaced.