Download Brake System Troubleshooting and more Exams Nursing in PDF only on Docsity!
Michigan State Brakes Certification/ 83 Quizzes
with Certified Ans/ Latest Update.
On a 3-channel system, which wheels are on the same circuit? - Answer: both rear wheels One way to test an ABS wheel speed signal is to use _____ on your digital multimeter. - Answer: AC volts The key input for the ABS control module comes from the: - Answer: wheel speed sensors ABS speed sensor and sensor rings: - Answer: should not be hammered or tapped on and should always be replaced as a matched set Flexible brake hoses should be replaced: - Answer: when dampness is evident on the hose Which of the following should be used to check for rotor thickness variation: - Answer: Micrometer
After rebuilding a master cylinder, the rod between the master cylinder and booster should be: - Answer: adjusted properly Upon inspecting brake fluid condition, the technician observes the diaphragm in the master cylinder cup is swollen. Which of the following is the most likely cause? - Answer: silicone fluid added to the system When inspecting brake fluid levels, a technician observes low fluid levels. which of the following should be done first? - Answer: Inspect disc brake pads for excessive wear Which of the following is true about most properly functioning anti-lock brake systems? - Answer: The brakes may lock up at speeds less than 10 miles per hour Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - Answer: Most ABS brake lines can be bled like a conventional (non-ABS) system. However, caution must be taken because of the extreme pressure. Most anti-lock brake systems require the removal of the pressure modulator fuse when: - Answer: a "spaced-saver" spare tire is being used and mismatched tires are being installed What does a load sensing proportioning valve do? - Answer: It increases the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source of the noise? - Answer: Glazed brake pads Which of the following is a true statement about proportioning valves? - Answer: They provide better braking balance during hard stops
A common cause of pedal pulsation during brake application is: - Answer: NOT caused by improperly torqued wheels, damaged backing plates, or lubricated shims the car is at reset. When you slowly apply the brake pedal you hear a squeaking noise at the rear of the vehicle. what could cause this noise? - Answer: dry backing plate contact surfaces While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - Answer: brake fluid or grease on the brake linings Wheel speed sensors: - Answer: send an A/C signal to the control module Which of the following incorrect service procedures will cause brake lock up? - Answer: Master Cylinder push rod adjusted too long During a road test, you find that when normal breaking pressure is applied the pedal slowly goes to the floor. What is the likely cause of this problem? - Answer: A leaking master cylinder primary piston seal. Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - Answer: relieve brake system pressure according to manufacturer procedures When would the pump motor be activated in an anti-lcok brake system with traction assist? - Answer: when brake pedal pulsates There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is most likely the cause of the problem? - Answer: a broken shoe hold-down spring or pin
If a drum brake self-adjuster seizes up, the likely result will be: - Answer: NOT a low pedal, worn or brake drum, or a loose emergency brake cable. After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - Answer: brake shoe return springs On a single anchor duo-servo drum brake system, which shoe does most of the braking? - Answer: secondary shoe Which lining does most of the braking on a leading/trailing brake? - Answer: primary shoe This tool is used to? - Answer: Adjust the brake shoes to the drum Which of the following could be a symptom of over-torqued lug nuts? - Answer: A brake pedal pulsation during braking. Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - Answer: RR, LR, RF, LF In disc brake caliper assemblies, the "square cut seal" is usually located: - Answer: In the caliper piston bore When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - Answer: Compressed air Sliding caliper disc brake pads are kept in adjustment by the - Answer: Square cut piston seal When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt. What can cause this problem? - Answer: A rotor thickness variation
Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - Answer: RR,LR, RF, LF All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - Answer: Clean the master cylinder with a degreasing solvent The brakes of a car tend to drag, which of the following could be the cause? - Answer: A stuck wheel cylinder or caliper piston When repairing damaged brake line, which of the following is correct? - Answer: Replace entire line that is damaged with a new line bent to the right shape using a tube bender A customer complains that the brake pedal slowly moves to the floor when a steady pressure is applied. There is no sign of fluid leakage. Which of the following is the most portable cause of the problem? - Answer: A worn primary cup A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - Answer: Excessive clearance between the shoes and drum. All of the following procedures, EXCEPT one describe the correct method for bleeding the individual brakes on a car after the master cylinder has been bled: - Answer: The bleeding sequence for all systems begins with the left rear wheel. Which of the following is the LEAST likely cause of one brake dragging? - Answer: A corroded master cylinder bore A car has a spongy pedal. Which of the following could be the cause? - Answer: Air in the system.
Which of the following is not correct in the procedure for preparing a brake rotor for matching?
- Answer: Use a brake micrometer to measure the diameter A car equipped with a vacuum assist power brake system reads an abnormal amount of pedal effort to stop the car, which of the following could be the cause? - Answer: A plugged booster air breather All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - Answer: Air in the system An example of an incorrect procedure for replacing brake pads in a disc brake system is: - Answer: Remove the piston from the caliper and clean all rust corrosion, and dirt A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely source of he problem? - Answer: The master cylinder If vacuum is present on both sides of the diaphragm in a brake booster: - Answer: The brakes are being released Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - Answer: Always remove the electronic brake control module fuse before adjusting or replacing a wheel speed sensor Which of the following is true when inspecting wheel speed sensors? - Answer: You should measure the air gap between the sensor and the reluctor wheel teeth Which of the following would be the result of an inoperative ABS pump/motor assembly: - Answer: Conventional braking should still be available
The rear brakes are dragging after having new linings installed and the drums machined. the most likely cause is the: - Answer: technician use the parking brake to adjust shoes and the cable is stuck When turning brake drums: - Answer: use a dampening strap to reduce chatter Which of the following is NOT a necessary drum brake measurement? - Answer: run-out
