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Ch33 Braking Fundamentals and Air Exam/79 Questions and Answers
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Ch33 Braking Fundamentals and Air Exam/79 Questions and Answers
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Ch33 Braking Fundamentals andAir Exam/79 Questions and
Answers
A moving vehicle - - Has a tremendous amount of kinetic energy.
- To stop a vehicle, the kinetic energy must be - - Converted into heat
energy through the braking system.
- Weight and speed have - - Different effects on braking requirements;
doubling the weight requires double the braking force but doubling the
weight and the speed requires eight times the braking force.
- To operate, brakes must - - Turn kinetic energy into heat, but they must
also be capable of dissipating the heat quickly, or they quickly lose their
effectiveness.
- As a vehicle brakes, its weight shifts from - - Back to front. Brakes must be
designed to be able to handle this inertia shift.
- All brake systems use some force - - To multiply the braking effort applied
to the brake pedal by the driver. This force can be compressed air, hydraulic
pressure, or a combination of the two.
- Compressed air is - - The primary method of choice to multiply brake force
for highway trucks.
- Air brake systems are very versatile and can be easily - - Connected to
trailers, plus there is no worry of leaks or spills, as in hydraulic systems.
- Air brake systems can handle - - Small system leaks without adverse
effects.
- All brake systems are dual-brake systems, meaning that if - - One system
fails the other can still stop the vehicle.
- Because of their simplicity, cam brakes are - - The most popular air brake
foundation brake system in on-highway trucks.
- Air brake systems are subject to - - Federal regulation under the Federal
Motor Vehicle Safety Standard 121.
- S-cam used in cam brakes can be - - Left or right handed.
, - Brake friction material is edge-coded to - - Ensure the material usd is
matched to the vehicle.
- Brake chamber size and slack adjuster lever length combine - - To deliver
a twisting force to the brake camshafts.
- brake chambers are - - Air operated diaphragm chambers used to apply
pressure to the brakes.
- Actuators have dual chambers with - - One containing a power spring to
operate the emergency or parking brake system.
- Spring brake chambers must be disarmed before - - They are discarded by
cutting the power spring with an acetylene torch.
- Slack adjusters are used to - - Keep the brake chamber stroke adjusted; all
modern vehicles are equipped with automatic slack adjusters.
- AL factor - - The size or surface area of a brake chamber multiplied by the
length of the slack adjuster in inches.
- Anti-fade - - An opposite condition of heat fade where the coefficient of
friction increases as the brakes get hotter.
- Automatic slack adjuster (ASAs) - - Automatically adjust brake stroke to
maintain the correct shoe-to-drum clearance.
- Brake block - - Brake friction material that is 0.75" thick.
- Brake fade - - The inability of the bake to maintain its effectiveness. Brake
fade causes a need for increased pedal application force to maintain the
same braking effectiveness.
- Brake foundation - - The braking components found at the wheel ends.
- Brake lining - - Brake friction material is a 1/2" (13 mm) thick.
- Brake torque - - The force applied to the foundation brakes during braking.
- Cam brakes - - An "S" shaped shaft head that twists between two rollers to
expand a set of brake shoes.
- Cam-opposite - - A cam brake where the cam rotates opposite the drum's
rotation to energize the brakes.
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