Brakes

For every task in Brakes, the following safety requirement must be strictly enforced:

Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations.

NATEF Tasks	Description	Priority designation
A	General Brake Systems Diagnosis
V.A.1	Identify and interpret brake system concern; determine necessary action.	P-1
V.A.2	Research applicable vehicle and service information, such as brake system operation, vehicle service history, service precautions, and technical service bulletins.	P-1
V.A.3	Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals).	P-1
B	Hydraulic System Diagnosis and Repair
V.B.1	Diagnose pressure concerns in the brake system using hydraulic principles (Paschal's Law).	P-1
V.B.2	Measure brake pedal height; determine necessary action.	P-2
V.B.3	Check master cylinder for internal and external leaks and proper operation; determine necessary action.	P-2
V.B.4	Remove, bench bleed, and reinstall master cylinder.	P-1
V.B.5	Diagnose poor stopping, pulling or dragging concerns caused by malfunctions in the hydraulic system; determine necessary action.	P-1
V.B.6	Inspect brake lines, flexible hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging or wear; tighten loose fittings and supports; determine necessary action.	P-2
V.B.7	Fabricate and/or install brake lines (double flare and ISO types); replace hoses, fittings, and supports as needed.	P-2
V.B.8	Select, handle, store, and fill brake fluids to proper level.	P-1
V.B.9	Inspect, test, and/or replace metering (hold-off), proportioning (balance), pressure differential, and combination valves.	P-2
V.B.10	Inspect, test, and adjust height (load) sensing proportioning valve.	P-3
V.B.11	Inspect, test, and/or replace components of brake warning light system.	P-3
V.B.12	Bleed (manual, pressure, vacuum or surge) brake system.	P-1
V.B.13	Flush hydraulic system.	P-3
C	Drum Brake Diagnosis and Repair
V.C.1	Diagnose poor stopping, noise, pulling, grabbing, dragging or pedal pulsation concerns; determine necessary action.	P-1
V.C.2	Remove, clean (using proper safety procedures), inspect, and measure brake drums; determine necessary action.	P-1
V.C.3	Refinish brake drum.	P-1
V.C.4	Remove, clean, and inspect brake shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related brake hardware, and backing support plates; lubricate and reassemble.	P-1
V.C.5	Remove, inspect, and install wheel cylinders.	P-2
V.C.6	Pre-adjust brake shoes and parking brake before installing brake drums or drum/hub assemblies and wheel bearings.	P-1
V.C.7	Install wheel, torque lug nuts, and make final checks and adjustments.	P-1
D	Disc Brake Diagnosis and Repair
V.D.1	Diagnose poor stopping, noise, pulling, grabbing, dragging or pedal pulsation concerns; determine necessary action.	P-1
V.D.2	Remove caliper assembly from mountings; clean and inspect for leaks and damage to caliper housing; determine necessary action.	P-1
V.D.3	Clean and inspect caliper mounting and slides for wear and damage; determine necessary action.	P-1
V.D.4	Remove, clean, and inspect pads and retaining hardware; determine necessary action.	P-1
V.D.5	Disassemble and clean caliper assembly; inspect parts for wear, rust, scoring, and damage; replace seal, boot, and damaged or worn parts.	P-2
V.D.6	Reassemble, lubricate, and reinstall caliper, pads, and related hardware; seat pads, and inspect for leaks.	P-1
V.D.7	Clean, inspect, and measure rotor with a dial indicator and a micrometer; follow manufacturer's recommendations in determining need to machine or replace.	P-1
V.D.8	Remove and reinstall rotor.	P-1
V.D.9	Refinish rotor according to manufacturer's recommendations.	P-1
V.D.10	Adjust calipers equipped with an integrated parking brake system.	P-3
V.D.11	Install wheel, torque lug nuts, and make final checks and adjustments.	P-1
E	Power Assist Units Diagnosis and Repair
V.E.1	Test pedal free travel with and without engine running; check power assist operation.	P-2
V.E.2	Check vacuum supply (manifold or auxiliary pump) to vacuum-type power booster.	P-2
V.E.3	Inspect the vacuum-type power booster unit for vacuum leaks; inspect the check valve for proper operation; determine necessary action.	P-2
V.E.4	Inspect and test hydro-boost system and accumulator for leaks and proper operation; determine necessary action.	P-3
F	Miscellaneous (Wheel Bearings, Parking Brakes, Electrical, Etc.) Diagnosis and Repair
V.F.1	Diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine necessary action.	P-1
V.F.2	Remove, clean, inspect, repack, and install wheel bearings and replace seals; install hub and adjust wheel bearings.	P-1
V.F.3	Check parking brake cables and components for wear, rusting, binding, and corrosion; clean, lubricate, or replace as needed.	P-2
V.F.4	Check parking brake operation; determine necessary action.	P-1
V.F.5	Check operation of parking brake indicator light system.	P-3
V.F.6	Check operation of brake stop light system; determine necessary action.	P-1
V.F.7	Replace wheel bearing and race.	P-1
V.F.8	Inspect and replace wheel studs.	P-1
V.F.9	Remove and reinstall sealed wheel bearing assembly.	P-2
G	Antilock Brake and Traction Control Systems
V.G.1	Identify and inspect antilock brake system (ABS) components; determine necessary action.	P-1
V.G.2	Diagnose poor stopping, wheel lock-up, abnormal pedal feel or pulsation, and noise concerns caused by the antilock brake system (ABS); determine necessary action.	P-2
V.G.3	Diagnose antilock brake system (ABS) electronic control(s) and components using self-diagnosis and/or recommended test equipment; determine necessary action.	P-1
V.G.4	Depressurize high-pressure components of the antilock brake system (ABS).	P-3
V.G.5	Bleed the antilock brake system's (ABS) front and rear hydraulic circuits.	P-2
V.G.6	Remove and install antilock brake system (ABS) electrical/electronic and hydraulic components.	P-3
V.G.7	Test, diagnose and service ABS speed sensors, toothed ring (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO) (includes output signal, resistance, shorts to voltage/ground, and frequency data).	P-1
V.G.8	Diagnose antilock brake system (ABS) braking concerns caused by vehicle modifications (tire size, curb height, final drive ratio, etc.).	P-3
V.G.9	Identify traction control system components.	P-3

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