Disc Brake Diagnosis and Repair

(10 Questions)

• Diagnose Disc brake hydraulic problems
  • poor stopping, pulling, dragging, or incorrect pedal travel
• Diagnose disc brake mechanical problems
  • poor stopping, noise, pulling, grabbing, dragging, pedal pulsation or incorrect pedal travel
• Retract integral parking brake caliper piston(s) according to manufacturers recommendations.
• Remove caliper assembly from mountings
  • inspect for leaks and damage to caliper housing.
• Clean, inspect, and measure caliper mountings and slides/pins for wear and damage.
• Remove, clean, and inspect pads and retaining hardware; determine needed repairs, adjustments, and replacements.
• Clean caliper assembly; inspect external parts for wear, rust, scoring, and damage;

replace any damaged or worn parts; determine the need to repair or replace caliper assembly.

• Clean, inspect, and measure rotor with a dial indicator and a micrometer; follow

manufacturers’ recommendations in determining the need to index, machine or replace the rotor.

• Remove and replace
  • Wheel
  • Caliper (disassemble)
  • Lubricate
  • Rotor.
• Machine rotor, using on-car or off-car method,
  • according to manufacturers’ procedures and specifications.
• Install pads, calipers, and related attaching hardware; lubricate components following

manufacturers’ procedures and specifications; bleed system.

• Adjust calipers with integrated parking brakes according to manufacturers’

recommendations.

• Fill master cylinder to proper level with recommended fluid; inspect caliper for leaks.
• Reinstall wheel, torque lug nuts, and make final checks and adjustments.
• Road test vehicle and
  • burnish/break-in pads according to manufacturer’s recommendations