Symptom Related Diagnostic Procedures

Symptoms

Brakes noisy

Possible Source(s):
- Brake pads.
- Brake discs.

Action(s) to take:
* GO to Pinpoint Test A. Pinpoint Test A: Brakes Noisy

Vibration when brakes are applied

Possible Source(s):
- Wheels require balancing.
- Wheel hub nuts.
- Caliper mounting bolts.
- Brake pads.
- Foreign material/scratches/corrosion on brake disc contact surfaces.
- Excessive brake disc thickness variation.
- Excessive brake disc runout.
- Wheel bearing wear or failure.
- Suspension bush wear or failure.
- Steering bush wear or failure.

Action(s) to take:
* Go to Pinpoint Test B. Pinpoint Test B: Vibration When Brakes Are Applied

The brakes pull or drift

Possible Source(s):
- Tire pressures/wear.
- Calipers.
- Brake pads.
- Brake discs.
- Wheel alignment adjustment.
- Wheel bearing.
- Suspension bushes and ball joints.

Action(s) to take:
* GO to Pinpoint Test C. Pinpoint Test C: the Brakes Pull or Drift

The pedal feels spongy

Possible Source(s):
- Air in brake system.
- Leak in hydraulic system.
- Brake booster/master cylinder.
- Brake pads.

Action(s) to take:
* GO to Pinpoint Test D. Pinpoint Test D: the Pedal Feels Spongy

The pedal goes down fast

Possible Source(s):
- Air in brake system.
- Leak in hydraulic system.
- Brake booster/master cylinder.
- Brake pads.

Action(s) to take:
* GO to Pinpoint Test E. Pinpoint Test E: the Pedal Goes Down Fast

The pedal goes down slowly

Possible Source(s):
- Air in brake system.
- Brake booster/master cylinder.

Action(s) to take:
* Go to Pinpoint Test F. Pinpoint Test F: the Pedal Goes Down Slowly

Excessive brake pedal effort

Possible Source(s):
- Brake pads.
- Brake booster.
- Vacuum pump.

Action(s) to take:
* GO to Pinpoint Test G. Pinpoint Test G: Excessive Brake Pedal Effort

Brake lockup during light brake pedal force

Possible Source(s):
- Brake pads.
- Calipers.

Action(s) to take:
* GO to Pinpoint Test H. Pinpoint Test H: Brake Lockup During Light Brake Pedal Force

Brakes drag

Possible Source(s):
- Parking brake control applied/malfunction.
- Seized parking brake cables.
- Seized caliper slide pins.
- Seized caliper.
- Brake booster.
- Pedal gear.

Action(s) to take:
* GO to Pinpoint Test I. Pinpoint Test I: Brakes Drag

Excessive/Erratic brake pedal travel

Possible Source(s):
- Hydraulic system.
- Brake pads.
- Brake discs.
- Hub and bearing assembly.

Action(s) to take:
* GO to Pinpoint Test J. Pinpoint Test J: Excessive/Erratic Brake Pedal Travel

The red brake warning indicator is always on

Possible Source(s):
- Fluid level.

Action(s) to take:
* FILL the system to specification.

CHECK for leaks.

Possible Source(s):
- Brake fluid level sensor.

Action(s) to take:
* INSTALL a new brake master cylinder fluid reservoir.

Possible Source(s):
- Parking brake control.

Action(s) to take:
* RELEASE and ADJUST the parking brake.

Possible Source(s):
- Electrical circuit.

Action(s) to take:
* For additional information, refer to the approved Jaguar diagnostic system for analysis/rectification of the concern.

Slow or incomplete brake pedal return

Possible Source(s):
- Brake pedal binding.
- Brake booster/master cylinder.

Action(s) to take:
* GO to Pinpoint Test K. Pinpoint Test K: Slow or Incomplete Brake Pedal Return