Anti-Lock Brake System: Troubleshooting: Notes

Symptom	Probable cause	Remedy
Noise or vibration when brakes are applied	Backing plate or caliper improperly mounted Correct Loose backing plate or caliper mounting bolts Unevenly worn or cracked brake drum or brake disc Foreign material in brake drum Seized pad or lining contact surface Excessive caliper to pad assembly clearance Uneven pad contact Lack of lubrication in sliding parts Loose suspension parts	Retighten Replace Clean Replace Correct Correct Lubricate Retighten
Vehicle pulls to one side when brakes are applied	Difference in left and right tire inflation pressure Improper front wheel alignment Inadequate contact of pad or lining Grease or oil on pad or lining surface Drum warpage or uneven wear Incorrect wheel cylinder installation Auto adjuster malfunction	Adjust Adjust Correct Replace Replace Correct Correct
Insufficient braking power	Low or deteriorated brake fluid Air in the brake system Brake booster malfunction Inadequate contact of pad or lining Grease or oil on pad or lining surface Auto adjuster malfunction Overheated brake rotor due to dragging of pad or lining Restricted brake line Proportioning valve malfunction Refill or change	Bleed the system Correct Correct Replace Correct Correct Replace Replace
Increased pedal stroke required (Reduced pedal to floorboard clearance)	Air in the system Brake fluid leaks Auto adjuster malfunction Excessive push rod to master cylinder clearance	Bleed the system Correct Correct Adjust
Brake drag	Incomplete release of parking brake Incorrect parking brake adjustment Worn brake pedal return spring Restricted master cylinder return port Broken rear drum brake shoe return spring Lack of lubrication in sliding parts Defective master cylinder check valve or piston return spring Insufficient push rod to master cylinaer clearance	Adjust Adjust Replace Correct Replace Lubricate Replace Replace
Insufficient parking brake function	Worn brake lining or pad Grease or oil on lining or pad surface Parking brake cable sticking Auto adjuster malfunction Excessive parking brake lever stroke	Replace Replace Replace Adjust Adjust the parking brake lever stroke or check the parking brake cable routing