HEAVY TRUCK BRAKES AND
BRAKING SYSTEMS STUDY GUIDE
CORRECT 100%
Anti-lock brakes (ABS) - ANSWERhelp prevent accidents and improve vehicle
control by preventing wheels from locking up during braking
Preset wheel bearing - ANSWERassembly where you install the part and torque the
retaining nut down (full turn and half turn 200-400 ft/lbs)
Grease-soaked brake linings - ANSWERshould be replaced, not soaked with grease
or oil
*Air break systems operation - ANSWERUsing the triple-valve principle, air builds up
inside the brake pipes or air lines, releasing the brakes.
*Air Brake functions - ANSWER1. Charging: The system must be pressurized with
air before the brakes will release. At rest, the brakes remain engaged. Once the
system reaches its operating pressure, the brakes are freed and ready to use.
Stability Control System - ANSWERPrevents rollovers and tipping caused by
cornering or sudden changes in direction
Brake Line Flares (Types) - ANSWERbubble 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) - ANSWERlooks like buttons (90 degree)
Double Flares (SAE or inverted flares) - ANSWERlooks like a funnel (45 degree)
Hydro-Boost Systems - ANSWERuses hydraulic pressure from power steering
system to provide the driver assist in applying the brakes
Hydraulic Brake Line Material - ANSWERmade using plated or coated mild steel
tubing
Air Brake hand valve - ANSWERaka 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 - ANSWERHeat 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
BRAKING SYSTEMS STUDY GUIDE
CORRECT 100%
Anti-lock brakes (ABS) - ANSWERhelp prevent accidents and improve vehicle
control by preventing wheels from locking up during braking
Preset wheel bearing - ANSWERassembly where you install the part and torque the
retaining nut down (full turn and half turn 200-400 ft/lbs)
Grease-soaked brake linings - ANSWERshould be replaced, not soaked with grease
or oil
*Air break systems operation - ANSWERUsing the triple-valve principle, air builds up
inside the brake pipes or air lines, releasing the brakes.
*Air Brake functions - ANSWER1. Charging: The system must be pressurized with
air before the brakes will release. At rest, the brakes remain engaged. Once the
system reaches its operating pressure, the brakes are freed and ready to use.
Stability Control System - ANSWERPrevents rollovers and tipping caused by
cornering or sudden changes in direction
Brake Line Flares (Types) - ANSWERbubble 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) - ANSWERlooks like buttons (90 degree)
Double Flares (SAE or inverted flares) - ANSWERlooks like a funnel (45 degree)
Hydro-Boost Systems - ANSWERuses hydraulic pressure from power steering
system to provide the driver assist in applying the brakes
Hydraulic Brake Line Material - ANSWERmade using plated or coated mild steel
tubing
Air Brake hand valve - ANSWERaka 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 - ANSWERHeat 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
