Exam 52: Disc Brakes

Disc brake caliper pistons are being removed. Technician A positions a large dull screwdriver in the piston's dust boot groove to pry out the piston. Technician B injects 25 psi (172 kPa)of air pressure into the fluid line connection bore to remove the caliper piston. Who is correct?

____________________ caliper disc brakes slide back and forth on pins or bolts.

Electrical sensors on some vehicles advise the driver when the brake pads have worn thin and need to be replaced.

____________________ bearings are the most common bearings used on the front wheels of RWD and the rear wheels of FWD vehicles.

The inner and outer races of tapered roller bearings are ____________________ shaped.

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?

Caliper housings are made from ______.

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 does NOT turn on when ______.

____________________ brakes cause poor fuel economy and generate destructive amounts of heat that can cause serious brake damage and brake failure.

There are brake pads available that require no break-in time.

Technician A says some caliper designs use only one pad lining per brake assembly. Technician B says some disc brake pads have wear sensors. Who is correct?

What nonbrake component concerns can cause the vehicle to pull when the brakes are applied?

Technician A replaces the pads if the linings are less than 1/8 inch (3.175 mm). Technician B says if the pad on one side of the caliper is worn more than the other side, the rotor has excess runout and must be replaced. Who is correct?

A(n)____________________ caliper has angular machined surfaces at each end that slide in mating machined surfaces on the anchor plate. This is where the caliper moves back and forth.

What are the three major parts of a disc brake assembly?

After new pads are installed, Technician A breaks in the new pads by making a half dozen or more hard stops from high speed to check whether the brakes will fade when hot. Technician B breaks in the new pads with several gentle to moderate stops, allowing time for the pads and rotors to cool between stops. Who is correct?

In most calipers, the dust boot is installed in the caliper bore groove before the piston is installed.

What is parallelism?

A brake inspection reveals that the outboard pad is significantly thinner than the inboard pad. Technician A says the problem could be a defective dust boot that caused the caliper to seize. Technician B says the problem could be caused by poor lubrication or deformation of the machined sliding areas on the caliper and/or anchor plate. Who is correct?