Automotive and Mechanics Brake Systems 2

Question 1

The 'discard dimension' stamped on a brake rotor indicates which specification?

Accepted Answer

The minimum thickness at which the rotor must be discarded

Answer

The rotor's original factory thickness

Answer

The maximum allowable lateral runout

Answer

The rotor's heat treatment rating

Question 2

A spongy or soft brake pedal that gradually sinks toward the floor most likely indicates which condition?

Accepted Answer

Air trapped in the hydraulic brake lines

Answer

Worn brake pads below minimum thickness

Answer

A seized caliper piston

Answer

An overheated brake booster diaphragm

Question 3

Which tool is most commonly used to retract a disc brake caliper piston when installing new brake pads?

Accepted Answer

C-clamp or dedicated caliper piston tool

Answer

Slide hammer and adapter

Answer

Brake bleeder vacuum kit

Answer

Torque angle adapter set

Question 4

When bleeding brakes on a four-wheel vehicle using the gravity or pressure method, which wheel is typically bled FIRST?

Accepted Answer

Rear right (furthest from master cylinder on most vehicles)

Answer

Front left (driver's side)

Answer

Front right (passenger's side)

Answer

Rear left

Question 5

What energy source does a conventional vacuum-assisted brake booster use to multiply the driver's pedal effort?

Accepted Answer

Engine intake manifold vacuum

Answer

An electric motor mounted to the booster

Answer

Compressed air from the AC compressor

Answer

Hydraulic pressure from the power steering pump

Question 6

A brake drum must be replaced rather than resurfaced when it has:

Accepted Answer

Exceeded its maximum allowable inside diameter specification

Answer

Visible surface rust on its outer face

Answer

Accumulated more than 50,000 miles of use

Answer

Minor light scoring from normal brake shoe contact

Question 7

A persistent grinding or metal-on-metal noise that occurs only when the brakes are applied most commonly indicates:

Accepted Answer

Brake pads worn completely through to the metal backing plate

Answer

Low brake fluid level in the reservoir

Answer

Air trapped in the brake hydraulic lines

Answer

A failing front wheel bearing