HEAVY TRUCK BRAKES MICHIGAN
MECHANIC COMPREHENSIVE EXAM
SCRIPT 2026 COMPLETE QUESTIONS AND
VERIFIED SOLUTIONS 100% CORRECT
⩥ Stability Control System. Answer: Prevents rollovers and tipping
caused by cornering or sudden changes in direction
⩥ Brake Line Flares (Types). Answer: bubble flares (also known as DIN
or ISO flares), whereas in the U.S. double flares (also known as SAE or
Inverted flares) are more common.
⩥ Bubble Flares (DIN or ISO flares). Answer: looks like buttons (90
degree)
⩥ Double Flares (SAE or inverted flares). Answer: looks like a funnel
(45 degree)
⩥ Hydro-Boost Systems. Answer: uses hydraulic pressure from power
steering system to provide the driver assist in applying the brakes
⩥ Hydraulic Brake Line Material. Answer: made using plated or coated
mild steel tubing
, ⩥ Air Brake hand valve. Answer: aka spike, a valve that allows the air
brake system to control the brakes of a trailer its pulling, independent of
tractor, can be manual or automatic, the amount of pressure depends on
how far the valve is opened
⩥ Drum Brake diagnosis. Answer: Heat checking, look for cracks on
drum circles
Polished drums, a mirror like finish on the inside caused by lightly
dragging brakes, use 80 grit to sand
Oblong Drum, caused by distortion from excessive heat or imperfections
⩥ Master Cylinder Operation. Answer: the heart of the brake system that
pumps break fluid through the brake system
⩥ Preset wheel bearing. Answer: assembly where you install the part and
torque the retaining nut down (full turn and half turn 200-400 ft/lbs)
⩥ Grease-soaked brake linings. Answer: should be replaced, not soaked
with grease or oil
⩥ *Air break systems operation. Answer: Using the triple-valve
principle, air builds up inside the brake pipes or air lines, releasing the
brakes.
MECHANIC COMPREHENSIVE EXAM
SCRIPT 2026 COMPLETE QUESTIONS AND
VERIFIED SOLUTIONS 100% CORRECT
⩥ Stability Control System. Answer: Prevents rollovers and tipping
caused by cornering or sudden changes in direction
⩥ Brake Line Flares (Types). Answer: bubble flares (also known as DIN
or ISO flares), whereas in the U.S. double flares (also known as SAE or
Inverted flares) are more common.
⩥ Bubble Flares (DIN or ISO flares). Answer: looks like buttons (90
degree)
⩥ Double Flares (SAE or inverted flares). Answer: looks like a funnel
(45 degree)
⩥ Hydro-Boost Systems. Answer: uses hydraulic pressure from power
steering system to provide the driver assist in applying the brakes
⩥ Hydraulic Brake Line Material. Answer: made using plated or coated
mild steel tubing
, ⩥ Air Brake hand valve. Answer: aka spike, a valve that allows the air
brake system to control the brakes of a trailer its pulling, independent of
tractor, can be manual or automatic, the amount of pressure depends on
how far the valve is opened
⩥ Drum Brake diagnosis. Answer: Heat checking, look for cracks on
drum circles
Polished drums, a mirror like finish on the inside caused by lightly
dragging brakes, use 80 grit to sand
Oblong Drum, caused by distortion from excessive heat or imperfections
⩥ Master Cylinder Operation. Answer: the heart of the brake system that
pumps break fluid through the brake system
⩥ Preset wheel bearing. Answer: assembly where you install the part and
torque the retaining nut down (full turn and half turn 200-400 ft/lbs)
⩥ Grease-soaked brake linings. Answer: should be replaced, not soaked
with grease or oil
⩥ *Air break systems operation. Answer: Using the triple-valve
principle, air builds up inside the brake pipes or air lines, releasing the
brakes.
