Document 71GeXX1Eqw37yy88b7jYOQaRj

BRAKE SYSTEM DIAGNOSIS AND TESTING LESSON ONE-MODULE 1 Brakes Pull or Drift If the vehicle does not travel in a straight line when the brakes are applied, it indicates uneven braking at one or more wheels. Brake pull or drift can be caused by: Stuck or seized calipers or wheel cylinders. Worn or damaged brake shoes or pads. Grease or fluid on the brake shoes or pads. Loose or damaged brake rotor shield mounting bolt. Severe disc brake "knock back." Unequal hydraulic pressure at the front calipers Improper brake adjustment or damaged adjuster mechanisms. Brake pull or drift can also be caused by the following non-brake concerns: Improper wheel alignment. Unequal air pressure in the tires. Unmatched tire sizes. Improper wheel bearing preload adjustment. Brakes Pull or Drift Diagnosis To find the cause of brake pull or drift, perform the following tests: Check the air pressure in the tires. Inspect the rotor shield and mounting bolt for damage and looseness. Inspect the brake shoes and pads for damage and/or foreign materials. Inspect the calipers and wheel cylinders for seizing. Check for brake caliper "knock back." Check for equal hydraulic pressure at the front calipers. Check wheel bearing preload. Check wheel alignment Inspect brake adjuster mechanisms and brake adjustment Brake System Diagnosis and Repair September, 2005 15