AUT 1012 - Brakes

A. General

1. Research vehicle service information such as fluid type, vehicle service history, service precautions, technical service bulletins, and recalls including vehicles equipped with advanced driver assistance systems (ADAS).
2. Identify brake system components and configurations.
3. Retrieve and record DTC’s, OBD monitor status, and freeze frame data; clear codes and data when directed.
4. Describe procedure for performing a road test check brake system operation, including an anti-lock brake system (ABS).
5. Install wheel and torque lug nuts.
6. Identify and interpret brake system concerns; determine needed action.

B. Hydraulic System

1. Diagnose pressure concerns in the brake system using hydraulic principles (Pascal’s Law).
2. Measure brake pedal height, travel, and free play (as applicable); determine needed action.
3. Check master cylinder for internal/external leaks and proper operation; determine needed action.
4. Inspect brake lines, flexible hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging, wear, and loose fittings/supports; determine needed action.
5. Select, handle, store, and fill brake fluids to proper level; use proper fluid type per manufacturer specification.
6. Identify components of hydraulic brake warning light system.
7. Bleed and/or replace fluid in the brake system.
8. Test brake fluid for contamination.
9. Remove, bench bleed, and reinstall master cylinder.
10. Diagnose poor stooping, pulling, or dragging concerns caused by malfunctions in the hydraulic system; determine needed action.
11. Replace brake lines using proper material and flaring procedures.
12. Fabricate brake lines using proper material and flaring procedures.
13. Inspect, test, and/or replace components of brake warning light system.

C. Drum Brakes

1. Remove, clean, and inspect brake drum; measure drum diameter; determine serviceability.
2. Refinish brake drum and measure final drum diameter; compare with specification.
3. Remove, clean, inspect, and/or replace brake shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related brake hardware, and backing support plates; lubricate and reassemble.
4. Inspect wheel cylinders for leaks and proper operation; remove and replace as needed.
5. Pre-adjust brake shoes and parking brake; install brake drums or drum/hub assemblies and wheel bearings; perform final checks and adjustments.
6. Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging, or pedal pulsation concerns; determine needed act.

D. Disc Brake

1. Remove and clean caliper assembly; inspect for leaks, damage, and wear; determine needed action.
2. Inspect caliper mounting and slides/pins for proper operation, wear, and damage; determine needed action.
3. Remove, inspect, and/or replace brake pads and retaining hardware; determine needed action.
4. Lubricate and reinstall caliper, brake pads, and related hardware; seat brake pads against rotor; inspect for leaks.
5. Clean and inspect rotor and mounting surface; measure rotor thickness, thickness variation, and lateral runout; determine needed action.
6. Remove and reinstall/replace rotor.
7. Refinish rotor on vehicle; measure final rotor thickness and compare with specification.
8. Refinish rotor off vehicle; measure final rotor thickness and compare with specification.
9. Retract and re-adjust caliper piston on an integrated parking brake system.
10. Describe importance of operating vehicle to burnish/break-.in replacement brake pads according to manufacturer’s recommendations.
11. Diagnose poor stopping, vibration, pulling, grabbing, dragging, or pulsation concerns; determine needed action.

E. Power-Assist Units

1. Check brake pedal travel with and without engine running to verify proper power booster operation.
2. Identify components of the brake power assist system (vacuum/hydraulic/electrical).
3. Inspect vacuum-type power booster unit for leaks; inspect the check-valve for proper operation; check vacuum supply (manifold or auxiliary pump); determine needed action.
4. Inspect and test hydraulically assisted power brake system for leaks and proper operation; determine needed action.

F. Related Systems (i.e., Wheel Bearings, Parking Brakes, Electrical)

1. Remove, clean, inspect, repack/replace, and install wheel bearings; remove and install bearing races; replace seals; install hub and adjust bearings.
2. Check parking brake system components for wear, binding, and corrosion; clean, lubricate, adjust and/or replace as needed.
3. Check parking brake operation (including electric parking brakes); check parking brake indicator light system operation; determine needed action.
4. Check operation of brake stop light system.
5. Inspect and replace wheel studs.
6. Remove, reinstall, and/or replace sealed wheel bearing assembly.
7. Diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine needed action.

G. Electronic Brake Control Systems: Antilock Brake (ABS), Traction Control (TCS), and Electronic Stability Control (ESC) Systems

1. Identify and inspect electronic brake control system components and describe function (ABS, TCS, ESC); determine needed action.
2. Describe the operation of a regenerative braking system.
3. Bleed the electronics brake control system hydraulic circuits.