AUT 121
Automotive Brake Systems Service Lab
Coconino Community College · UGRD · Fall 2026
Catalog description
One lecture. Four lab. Emphasizes service of automotive and light truck brake systems. Topics will include: power assist units diagnosis and repair, brakes related (Wheel Bearings, Parking Brakes, Electrical, Etc.), and antilock brake and traction control systems. Students will be able to: test pedal free travel with and without engine running; check power assist operation; check vacuum supply (manifold or auxiliary pump) to vacuum-type power booster; inspect the vacuum-type power booster unit for vacuum leaks; inspect the check valve for proper operation; determine necessary action; inspect and test hydro-boost system and accumulator for leaks and proper operation; determine necessary action; diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine necessary action; remove, clean, inspect, repack, and install wheel bearings and replace seals; install hub and adjust wheel bearings; check parking brake cables and components for wear, rusting, binding, and corrosion; clean, lubricate, or replace as needed; check parking brake operation; determine necessary action; check operation of parking brake indicator light system; check operation of brake stop light system; determine necessary action; replace wheel bearing and race; inspect and replace wheel studs; remove and reinstall sealed wheel bearing assembly; identify and inspect antilock brake system (ABS) components; determine necessary action; diagnose poor stopping, wheel lock-up, abnormal pedal feel or pulsation, and noise concerns caused by the antilock brake system (ABS); determine necessary action; diagnose antilock brake system (ABS) electronic control(s) and components using self-diagnosis and/or recommended test equipment; determine necessary action; depressurize high-pressure components of the antilock brake system (ABS); bleed the antilock brake system’s (ABS) front and rear hydraulic circuits; remove and install antilock brake system (ABS) electrical/electronic and hydraulic components; test, diagnose and service ABS speed sensors, toothed ring (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage. This course has additional learning outcomes; please see the course syllabus for a full list of outcomes. Pre/Corequisite(s): AUT 120 . Grading Option: May be taken for S/U credit.
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