Exam 52: Disc Brakes

What channels the flow of air over the exposed rotor surfaces?

A resurfaced rotor must be _____ inch thicker than the discard dimension to allow for wear.

Some caliper assemblies can contain up to ____________________ cylinder bores and pistons.

After a road test, what items should be checked before the wheels are pulled?

The splash shield and wheel direct air over the rotor to aid cooling.

The customer complains of a high-pitched squeal whenever the wheels are turning, except when the brakes are applied. Technician A says the pads are worn and need replacement. Technician B says the rotors are scored and must be replaced. Who is correct?

Linings are ____ to disc brake pads.

Technician A uses a minimum of 50 psi (345 kPa) of air pressure to force the piston from the caliper housing. Technician B heats the caliper housing with an oxyacetylene torch to boil the fluid and pop the piston out of the housing. Who is correct?

Technician A says a ventilated rotor helps cool the disc brake assembly. Technician B says the splash shield helps cool the disc brake assembly. Who is correct?

The red Brake warning light is NOT turned on when ______.

Composite rotors are made of cast iron and ______.

Rotors are typically made from ______.

Identify three causes of a hard brake pedal.

Improper tightening of the wheel lug nuts could cause the rotor to ____________________.

Front calipers are mounted to the____________________.

The disc brake piston is made of steel, aluminum, or _____.

Electronic pad wear warning systems are being discussed. Technician A says the pad wear sensors are wired in parallel. Technician B says the wear sensors are wired in series. Who is correct?

Most manufacturers recommend that the caliper mounting pins and their bushings be replaced each time the caliper is removed.

Technician A says if the plated surface of a steel piston is worn, pitted, scored, or corroded, it can be lightly filed with a mill file then polished with emery cloth. Technician B says if there are any cracks, chips, or gouges in a phenolic piston, it must be replaced. Who is correct?

Audible pad wear sensors have electrical contacts embedded in the linings. These contacts trigger the chime module when the pads wear down.