Exam 50: Brake Systems

The residual pressure check valve is used in the hydraulic circuit for ______ brakes.

List two ways of improving heat dissipation on a disc brake.

Name three types of brake lining friction materials.

All manufacturers recommend a specific sequence to follow when bleeding a vehicle's brakes.

After replacing a vacuum booster, the brakes lock up on a road test. Technician A says there is air trapped inside the brake lines. Technician B says the power booster pushrod needs adjustment. Who is correct?

The brake system converts the momentum of the vehicle into ____________________.

The actuator lever on the height-sensing proportioning valve is connected to the ____________________.

All brake fluids are hygroscopic-that is, they readily absorb water.

On a disc/drum system, the rear drum brakes lock up when the brake pedal is pressed hard. Technician A says the proportioning valve may not be functioning. Technician B says the axle height valve may be out of adjustment. Who is correct?

Asbestos has not been used in brake linings or pads since 2003.

The owner of a vehicle complains the car is hard to stop. The technician doing the diagnosis starts by pumping the brake pedal several times with the engine off, and then starts the engine while holding firm pressure on the brake pedal. The pedal falls away slightly and less pressure is needed to maintain the pedal in any position. This test proves that ______.

Brake lines are made of ______.

Master cylinders are generally not overhauled in the field. They are replaced with new or rebuilt master cylinders.

A technician is diagnosing a vehicle with a braking system problem. When she removes the filler cap to check the fluid level in the master cylinder, she notices that the rubber seal on the cap is swollen and has begun to disintegrate. What could be the problem?

An aluminum master cylinder ______.

Fully metallic linings require very high pedal pressure and tend to quickly wear out drums and rotors.

Identify the two dual brake system layouts.

A master cylinder that has a bulge at the rear, near the mounting flange, is a _____type master cylinder.

What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump?

If the front hydraulic circuit fails on a front/rear split brake system, the vehicle will lose 50 percent of its braking power.