Symptom Related Diagnostic Procedures

Diagnosis By Symptoms

Condition(s):
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.

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 PDU 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.