Ase Brakes Exam Questions And Answers

1) The brake pedal feels soft after the master cylinder has been replaced. Technician A says that a leaking power booster could be the cause. Technician B says that air in the hydraulic system could be the cause. Who is right? - Answer- B only Explanation: A leaking power brake booster will cause the brake pedal to be hard. Technician A's statement is false. Air in the hydraulic system may cause the pedal to be soft. Technician B's statement is true. The correct answer is B. 2) A vehicle's brake pedal goes to the floor. Technician A says that an internal master cylinder leak could be the cause. Technician B says that seized wheel cylinder pistons could be the cause. Who is right? - Answer- A only Explanation: Fluid bypassing the master cylinder primary cup may cause the brake pedal to go to the floor. Technician A's statement is true. Seized wheel cylinder pistons will not cause the brake pedal to go to the floor. Technician B's statement is false. The correct answer is A. 3) A vehicle pulls to the left during braking and pulls right without braking. This could be caused by: - Answer- a collapsed right front brake hose. Explanation: Unequal tire pressure will cause a pull to one side with or without braking. A failed master cylinder will not cause a pull. A seized left front caliper will cause a pull to the right during braking. A collapsed right front brake hose may trap pressurized fluid between the hose and the caliper piston causing a pull to the right without brake application. The collapsed hose may restrict fluid flow to the caliper piston when the brakes are applied, causing a pull to the left. The correct answer is C. 4) The front of the vehicle dips noticeably during braking on a vehicle with disc/drum brakes. Which of these could be the cause? - Answer- Stuck-open metering valve Explanation: The proportioning valve moderates pressure to the rear wheels. A collapsed front brake hose or seized caliper pistons will not cause the symptom. A stuck-open metering valve will allow the front brakes to apply too soon causing the front of the vehicle to dip. The correct answer is B. 5) Technician A says that the bleeder valve on the caliper should be opened when collapsing a caliper piston.Technician B says that the brake hose should be clamped when collapsing a caliper piston.Who is right? - Answer- A only Explanation: The purpose of opening the bleeder is to prevent contaminated fluid in the c