Brake Systems and Safety Inspection Flashcards

Which is the correct way to clean brake dust from drum brake assemblies?

Answer: Use a wet-wash system or a HEPA-filtered vacuum

Brake dust may contain asbestos or harmful fibers, so wet cleaning or HEPA vacuuming keeps it out of the air.

On many modern vehicles, which ABS function replaces the mechanical proportioning valve?

Answer: Electronic brake force distribution (EBD)

EBD uses the ABS modulator to control rear brake pressure electronically based on wheel speed data.

The red brake warning light stays on after the parking brake is fully released. What is a likely cause?

Answer: Low brake fluid level in the master cylinder reservoir

The red brake warning light comes on for parking brake application, low fluid level, or a hydraulic pressure imbalance.

During a safety inspection, a flexible brake hose bulges when the pedal is applied. What is the correct action?

Answer: Replace the brake hose

A ballooning hose has weak internal layers and can burst, so it must be replaced.

Which tool is used to measure disc brake rotor lateral runout?

Answer: Dial indicator

A dial indicator mounted solidly against the rotor face measures runout as the rotor turns.

Why should wheel lug nuts be tightened with a torque wrench in a star pattern?

Answer: To prevent rotor distortion that can cause pedal pulsation

Uneven or excessive lug nut torque can distort the rotor and cause runout and pulsation.

Technician A says brake lines should be inspected for corrosion, kinks, and leaks during a safety inspection. Technician B says steel brake lines can be repaired with compression fittings. Who is correct?

Answer: Technician A only

Brake lines must be inspected, but compression fittings are not approved for brake line repair; use double-flare or ISO-flare fittings.