Brake Symptom Diagnosis

Precautions: Precautions for Brake Service · Precautions for Brakes · General safety (00)

Condition	Possible Cause	Action
Not enough braking force	Brake fluid leakage from brake lines	Locate leaking point and repair.
	Brake disc or pads stained with fluid, grease or other oil	Clean or replace. •Front Brake Disc: •Front Brake Pad: •Rear Brake Disc: •Rear Brake Pad:
	Overheated brakes	Determine cause and repair.
	Badly worn brake pad	Replace. •Front: •Rear:
	Malfunctioning brake caliper assembly	Repair or replace. •Front: •Rear:
	Air in system	Bleed brake system.
	Brake booster internal failure	Replace brake booster.
	Negative pressure for brake booster is inadequate	Check engine condition and vacuum hose.
	Malfunctioning ESP^®	Check system and replace if necessary.
Vehicle pulls to one side (Brakes not working uniformly)	Pads and/or disc are wet with water or stained with oil in some brakes	Clean or replace. •Front Brake Disc: •Front Brake Pad: •Rear Brake Disc: •Rear Brake Pad:
	Disc is out of round in some brakes	Replace. •Front: •Rear:
	Tires are inflated unequally	Inflate equally.
	Disturbed front wheel alignment	Adjust as specified.
	Unmatched tires on the same axle	Tires with approximately the same amount of tread should be used on the same axle.
	Restricted brake pipes or hoses	Check for damage and replace pipes and/or hoses if necessary.
	Malfunctioning caliper assembly	Check for stuck or sluggish pistons and proper lubrication of caliper slide pin. •Front: •Rear:
	Loose suspension parts	Check all suspension mountings.
	Loose calipers	Check and tighten bolts to specified torque. •Front: •Rear:
Noise (High pitched squeak without brake applied)	Contact of wear indicator to brake disc	Replace brake pads. •Front: •Rear:
Excessive pedal travel (Pedal stroke too large)	Brake fluid leakage	Locate leaking point and repair.
	Air in system (soft / spongy pedal)	Bleed brake system.
	Badly worn brake pad	Replace. •Front: •Rear:
Brake locked	Malfunctioning ESP^®	Check ESP^® system.
Dragging brakes (A very light drag is present in all brakes immediately after pedal is released)	Master cylinder pistons not returning correctly	Replace brake master cylinder.
	Restricted brake pipes or hoses	Check for damage and replace pipes and/or hoses if necessary.
	Incorrect parking brake adjustment on rear brakes	Check and adjust to correct specifications.
	Sluggish parking brake cables	Repair or replace.
	Caliper piston sticking	Repair if necessary. •Front: •Rear:
	Badly worn piston seal in caliper	Replace piston seal. •Front: •Rear:
	Improper brake pedal free height	Check brake pedal free height.
Pedal pulsation (Pedal pulsates when depressed for braking)	Damaged or loose wheel bearings	Replace front wheel bearings and/or rear wheel hub assembly. •Front: •Rear:
	Distorted steering knuckle or rear wheel hub assembly	Replace. •Knuckle: •Rear Wheel hub:
	Excessive brake disc deflection	Check per instructions. If check result is not as specified, replace or machine disc. •Front: •Rear:
Braking noise	Glazed brake pads	Repair or replace brake pads. •Front: •Rear:
	Loose front wheel bearings	Replace wheel hub.
	Contact of wear indicator to brake disc	Replace brake pads. •Front: •Rear:
ABS warning light remains ON (for more than 2 sec) after setting ignition “ON”	Faulty ESP^® function	Perform ESP^® system check.
	Faulty ESP^® control module power supply and ground circuits	Check ESP^® control module power supply and ground circuits.
	Faulty combination meter	Replace combination meter.
ABS warning light does not turn ON after setting ignition “ON”	Faulty combination meter power supply and ground circuits	Check combination meter and its circuit.
	Faulty combination meter	Replace combination meter.
	Malfunctioning CAN communication system	Check CAN communication system. •M16A model: •K14C model: •D16AA model:
	Blown fuse	Check “MTR” fuse and circuit led to “MTR” fuse and replace if necessary.
ESP warning light remains ON (for more than 2 sec) after setting ignition “ON”	Faulty ESP^® function	Perform ESP^® system check.
	Faulty ESP® control module power supply and ground circuits	Check ESP^® control module power supply and ground circuits.
	Faulty combination meter	Replace combination meter.
	Faulty ESP^® control module	Replace ESP^® control module.
ESP warning light does not turn ON after setting ignition “ON”	Faulty combination meter power supply and ground circuits	Check combination meter and its circuit.
	Faulty combination meter	Replace combination meter.
	Malfunctioning CAN communication system	Check CAN communication system. •M16A model: •K14C model: •D16AA model:
	Blown fuse	Check “MTR” fuse and circuit led to “MTR” fuse and replace if necessary.
	Faulty ESP^® control module	Replace ESP^® control module.
Brake warning light remains ON (for more than 2 sec) after starting engine	ESP^® control module connector is not connected properly	Connect ESP^® control module connector again.
	Parking brake is applied	Release parking brake and check that warning light goes off.
	Insufficient amount of brake fluid	Check brake fluid level.
	Faulty parking brake switch and/or brake fluid level switch	Check parking brake switch and/or brake fluid level switch. •Parking brake switch: •Brake fluid level switch:
	Malfunctioning CAN communication system	Check CAN communication system. •M16A model: •K14C model: •D16AA model:
	Faulty combination meter	Replace combination meter.
	Faulty ESP^® control module	Replace ESP^® control module.
Brake warning light does not turn ON after setting ignition “ON”	Faulty combination meter power supply and ground circuits	Check combination meter and its circuit.
	Faulty combination meter	Replace combination meter.
	Faulty ESP^® control module	Replace ESP^® control module.