Pinpoint Test J: Excessive/Erratic Brake Pedal Travel
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
- J1: ROAD TEST
- Road test the vehicle
- Apply the brakes slowly
Is the brake pedal effort and brake pedal travel normal?
Yes
Vehicle is OK
No
GO to J2.
- J2: CHECK BRAKE FLUID LEVEL
- Check the brake master cylinder reservoir fluid level
Is the fluid level OK?
Yes
GO to J3.
No
CHECK brake master cylinder reservoir sealing points. For additional information, refer to BRAKE MASTER CYLINDER . ADD brake fluid and BLEED the brake system. Refer to: BRAKE SYSTEM BLEEDING TEST the system for normal operation.
REPEAT road test if necessary
- J3: CHECK BRAKE PEDAL RESERVE
- Run engine at idle speed
- Apply the brake pedal lightly three or four times
- Wait 15 seconds for the vacuum to replenish
- Push down on the brake pedal until it stops moving downward or an increased resistance to the brake pedal travel occurs
- Hold the brake pedal in the applied position while increasing the engine speed to 2000 revs/min
- Release the accelerator pedal
Does the brake pedal move downward as the engine speed returns to idle?
Yes
GO to J4.
No
CHECK the vacuum to the brake booster
- J4: CHECK THE FRONT WHEEL BEARING ASSEMBLY
- Check the front wheel bearing assembly
Are the front wheel bearings loose?
Yes
INSTALL a new front wheel bearing if damaged. Refer to: FRONT WHEEL BEARING AND WHEEL HUB - PROJECT 8 TEST the system for normal operation.
No
CHECK the front brake discs for thickness variances