Eagle L4-150 2.5L (1983)
Vacuum Brake Booster: Testing and Inspection
Hard Brake Pedal
A "hard" brake pedal could be caused by internal binding in the power unit or a failed vacuum check valve. Refer to Decreasing Brake Pedal Travel to
test power brake unit for an internal bind. To check for a failed vacuum check valve, proceed as follows:
1. Start engine and increase engine speed to approximately 1500 rpm, then close throttle and stop engine.
2. Wait 90 seconds, then try brake action.
3. If brakes are not vacuum assisted for two or more applications, replace check valve.
