HEAVY TRUCK BRAKES MICHIGAN
MECHANIC STUDY GUIDE SCRIPT 2026
TESTED QUESTIONS WITH COMPLETE
SOLUTIONS GRADED A+
⩥ Contaminated brake fluid. Answer: A possible reason for the brake
pedal slowly going to the floor under normal braking pressure.
⩥ Internal leak in the master cylinder. Answer: A common cause for the
brake pedal going to the floor when normal braking pressure is applied.
⩥ Faulty brake booster. Answer: A potential issue that could cause the
brake pedal to slowly go to the floor during a road test.
⩥ Vacuum power brake booster test. Answer: To test it, disconnect the
vacuum hose and observe engine idle.
⩥ Brake pedal pumping test. Answer: Pump the brake pedal at least 4
times, hold the brake pedal depressed, and start the engine to test the
vacuum power brake booster.
⩥ Parking brake application. Answer: Apply the parking brake and start
the engine as part of the vacuum power brake booster test.
, ⩥ Vacuum check at the booster. Answer: Check for vacuum at the
booster with a gauge to test the vacuum power brake booster.
⩥ Depressurizing an ABS system. Answer: The proper way includes
opening the bleeder valves.
⩥ Disconnecting the ABS fuse. Answer: A method to depressurize an
ABS system.
⩥ Pumping the brake pedal. Answer: Pump the brake pedal at least 25
times with the ignition off to depressurize an ABS system.
⩥ ABS self-diagnostic test. Answer: Running this test is one way to
depressurize an ABS system.
⩥ Dragging rear brakes. Answer: The most likely cause after new linings
installed and drums machined is a stuck parking brake cable.
⩥ Warped drums. Answer: A possible reason for rear brakes dragging
after new linings are installed.
⩥ Improperly adjusted brake shoes. Answer: A likely cause of rear
brakes dragging after new linings and machined drums.
MECHANIC STUDY GUIDE SCRIPT 2026
TESTED QUESTIONS WITH COMPLETE
SOLUTIONS GRADED A+
⩥ Contaminated brake fluid. Answer: A possible reason for the brake
pedal slowly going to the floor under normal braking pressure.
⩥ Internal leak in the master cylinder. Answer: A common cause for the
brake pedal going to the floor when normal braking pressure is applied.
⩥ Faulty brake booster. Answer: A potential issue that could cause the
brake pedal to slowly go to the floor during a road test.
⩥ Vacuum power brake booster test. Answer: To test it, disconnect the
vacuum hose and observe engine idle.
⩥ Brake pedal pumping test. Answer: Pump the brake pedal at least 4
times, hold the brake pedal depressed, and start the engine to test the
vacuum power brake booster.
⩥ Parking brake application. Answer: Apply the parking brake and start
the engine as part of the vacuum power brake booster test.
, ⩥ Vacuum check at the booster. Answer: Check for vacuum at the
booster with a gauge to test the vacuum power brake booster.
⩥ Depressurizing an ABS system. Answer: The proper way includes
opening the bleeder valves.
⩥ Disconnecting the ABS fuse. Answer: A method to depressurize an
ABS system.
⩥ Pumping the brake pedal. Answer: Pump the brake pedal at least 25
times with the ignition off to depressurize an ABS system.
⩥ ABS self-diagnostic test. Answer: Running this test is one way to
depressurize an ABS system.
⩥ Dragging rear brakes. Answer: The most likely cause after new linings
installed and drums machined is a stuck parking brake cable.
⩥ Warped drums. Answer: A possible reason for rear brakes dragging
after new linings are installed.
⩥ Improperly adjusted brake shoes. Answer: A likely cause of rear
brakes dragging after new linings and machined drums.
