Heavy Duty Truck Systems – Chapter 29 – Review Questions & Answer Practice
Sheet
In hydraulic disc brakes, the pads are forced against the rotors by: - correct answer ✔✔the
pistons
As the pressure of fluid received by the wheel cylinder of a drum brake system increases, which
of the following happens? - correct answer ✔✔The wheel cylinder cups and pistons are forced
apart
Which of the following safety devices delays application of front disc brakes in a disc/drum
system until pressure is built up in the hydraulic system? - correct answer ✔✔a metering valve
In a typical air-over-hydraulic brake system, -depressing the treadle causes which of the -
following? - correct answer ✔✔Air pressure is sent to the booster assemblies.
Which of the following correctly describes the function of a load proportioning valve (LPV) in an
air-over-hydraulic system? - correct answer ✔✔It increases the percentage of braking -
performed by the rear axle(s) as vehicle load increases.
In a hydraulic brake system, brake fluid transmits any pressure applied: - correct answer
✔✔equally to all parts of the enclosed circuit
In a hydraulic brake system, which of the following best describes what happens when the
driver s foot is applied to the brake pedal? - correct answer ✔✔Mechanical force is converted to
hydraulic force then back to mechanical force.
What component in a hydraulic brake system helps fluid in the master cylinder return back to
the reservoir after a brake application? - correct answer ✔✔a compensating port
Sheet
In hydraulic disc brakes, the pads are forced against the rotors by: - correct answer ✔✔the
pistons
As the pressure of fluid received by the wheel cylinder of a drum brake system increases, which
of the following happens? - correct answer ✔✔The wheel cylinder cups and pistons are forced
apart
Which of the following safety devices delays application of front disc brakes in a disc/drum
system until pressure is built up in the hydraulic system? - correct answer ✔✔a metering valve
In a typical air-over-hydraulic brake system, -depressing the treadle causes which of the -
following? - correct answer ✔✔Air pressure is sent to the booster assemblies.
Which of the following correctly describes the function of a load proportioning valve (LPV) in an
air-over-hydraulic system? - correct answer ✔✔It increases the percentage of braking -
performed by the rear axle(s) as vehicle load increases.
In a hydraulic brake system, brake fluid transmits any pressure applied: - correct answer
✔✔equally to all parts of the enclosed circuit
In a hydraulic brake system, which of the following best describes what happens when the
driver s foot is applied to the brake pedal? - correct answer ✔✔Mechanical force is converted to
hydraulic force then back to mechanical force.
What component in a hydraulic brake system helps fluid in the master cylinder return back to
the reservoir after a brake application? - correct answer ✔✔a compensating port
