Symptom Related Diagnostic Procedures
Brakes noisyPossible Source(s):
^ Brake pads.
^ Brake discs.
Action(s) to take:
^ GO to Pinpoint Test A.
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.
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.
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.
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.
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.
Excessive brake pedal effort
Possible Source(s):
^ Brake pads.
^ Brake booster.
^ Vacuum pump.
Action(s) to take:
^ GO to Pinpoint Test G.
Brake lockup during light brake pedal force
Possible Source(s):
^ Brake pads.
^ Calipers.
Action(s) to take:
^ GO to Pinpoint Test H.
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.
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.
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