G874174P7: Excessive Brake Pedal Effort

PINPOINT TEST G874174p7: EXCESSIVE BRAKE PEDAL EFFORT

G874174t23: CHECK BRAKE PADS

1. Check the brake pads for wear, contamination, correct installation, damage and type.

^ Are any concerns found?

-> Yes
INSTALL brake pads correctly or INSTALL new brake pads as required.
TEST the system for normal operation. REPEAT road test.

-> No
GO to Pinpoint Test G874174t24.

G874174t24: CHECK VACUUM

1. Disconnect the vacuum hose from the brake booster.
2. Connect a vacuum/pressure tester to the vacuum hose.
3. Run the engine at normal operating temperature.
4. Record the vacuum reading.

^ Is the reading 90 kPa (26.5 in-Hg) or greater

-> Yes
GO to Pinpoint Test G874174t25.

-> No
LOCATE and REPAIR the source of low vacuum. TEST the system for normal operation.

G874174t25: INSPECT SYSTEM

1. Switch the engine off.
2. Reconnect the vacuum hose.
3. Inspect the brake booster, rubber grommet, and all vacuum plumbing for cracks, holes, damaged connections, or missing clamps.
4. Pump the brake pedal several times to exhaust the vacuum. Push down on the brake pedal and hold.

^ Does the brake pedal move down when the engine is started?

-> Yes
Vacuum system is OK.

-> No
GO to Pinpoint Test G874174t26.

G874174t26: CHECK POWER BRAKE BOOSTER VALVE

1. Check the brake booster valve.

^ Is the power brake booster valve OK?

-> Yes
CHECK the brake booster. Refer to Brake Booster component test. Brake Booster INSTALL a new brake booster as required.
TEST the system for normal operation.

-> No
INSTALL a new brake booster valve. TEST the system for normal operation.