G874174P4: the Pedal Feels Spongy

PINPOINT TEST G874174p4: THE PEDAL FEELS SPONGY

G874174t13: CHECK FOR SPONGY PEDAL (ENGINE OFF)

1. Check for a firm brake pedal.

^ Is the brake pedal effort and brake pedal travel normal?

-> Yes
Vehicle is OK.

-> No
GO to Pinpoint Test G874174t14.

G874174t14: CHECK BRAKE PEDAL RESERVE (ENGINE OFF)

1. Pump the brake pedal 10 times and hold on the final application.
^ Does the brake pedal feel firm on final application?

-> Yes
GO to Pinpoint Test G874174t15.

-> No
BLEED the brake system.

G874174t15: CHECK BRAKE PEDAL RESERVE (ENGINE ON)

1. Apply Parking Brake and ensure transmission is in park/neutral.
2. Start engine and allow to idle.
3. Apply the brake pedal lightly three or four times.
4. Wait 15 seconds for the vacuum to recover.
5. Push down on the brake pedal until it stops moving downward or an increased resistance to the brake pedal travel occurs.
6. Hold the brake pedal in the applied position while increasing the engine speed to 2000 rpm.
7. Release the accelerator pedal.

^ Does the brake pedal move downward as the engine speed returns to idle?

-> Yes
GO to Pinpoint Test G874174t16.

-> No
CHECK the vacuum to brake booster.

G874174t16: CHECK BRAKE FLUID LEVEL

1. Check the brake master cylinder reservoir fluid level.

^ Is the fluid level OK?

-> Yes
BLEED the brake system.
TEST the system for normal operation.

-> No
CHECK for leaking brake system and RECTIFY as necessary. ADD fluid and BLEED the brake system.
TEST the system for normal operation. REPEAT road test if required.