Download ✅ SOS Mechanic Certification – Brakes Questions & Answers | 100% Correct | Verified 2025/2 and more Exams Electrical Engineering in PDF only on Docsity!
SOS Mechanic Certification- Brakes
Questions & Answers | 100%
Correct | Verified
Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? - ✔✔Sealed non-serviceable to test a vacuum power brake booster in the vehicle, you should pump the brake pedal at least 4 times, hold the brake pedal depressed, and start the engine. the brake pedal should: - ✔✔drop slightly and remain firm You are installing a set of brake shoe linings that are not the same length. Traditionally, the primary shoe lining is: - ✔✔Smaller and goes towards the front of the car. A cracked or torn vacuum diaphragm in a brake power booster would most likely cause: - ✔✔a hard pedal feel requiring very high pedal effort to stop A mechanic finds gear lube inside both rear brake drums on a rear wheel drive vehicle. What is the most likely cause of this problem? - ✔✔A plugged axle Which of the following incorrect service procedures will cause brake lock-up? - ✔✔master cylinder push rod adjusted too long Which of the following describes the proper way to depressurized an ABS system? - ✔✔Pump the brake pedal at least 25 times (or more, depending on the manufacturer's recommendation) with the ignition off. The rear brakes are dragging after having new linings installed and the drums machined. the most likely cause is the: - ✔✔technician use the parking brake to adjust shoes and the cable is stuck When turning brake drums: - ✔✔use a dampening strap to reduce chatter
Which of the following is NOT a necessary drum brake measurement? - ✔✔run-out On a 3-channel system, which wheels are on the same circuit? - ✔✔both rear wheels One way to test an ABS wheel speed signal is to use _____ on your digital multimeter. - ✔✔AC volts The key input for the ABS control module comes from the: - ✔✔wheel speed sensors ABS speed sensor and sensor rings: - ✔✔should not be hammered or tapped on and should always be replaced as a matched set Flexible brake hoses should be replaced: - ✔✔when dampness is evident on the hose Which of the following should be used to check for rotor thickness variation: - ✔✔Micrometer After rebuilding a master cylinder, the rod between the master cylinder and booster should be: - ✔✔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? - ✔✔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? - ✔✔Inspect disc brake pads for excessive wear Which of the following is true about most properly functioning anti-lock brake systems? - ✔✔The brakes may lock up at speeds less than 10 miles per hour
The brake lights on a car do not light when the brake pedal is depressed, which of the following is the LEAST likely cause of the problem? - ✔✔A burned out bulb. Which of the following incorrect service procedures could cause brake pedal pulsation? - ✔✔incorrect run-out on the car brake lathe What type of rotor surface provides the best braking with new pads? - ✔✔A smooth, flat surface which of the following is a quick way to isolated a defective master cylinder? There are no external leaks in the system. - ✔✔pump up the brake pedal, then hold it firm. if the pedal slowly drops to the floor, the master cylinder may be defective. A common cause of pedal pulsation during brake application is: - ✔✔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? - ✔✔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: - ✔✔brake fluid or grease on the brake linings Wheel speed sensors: - ✔✔send an A/C signal to the control module Which of the following incorrect service procedures will cause brake lock up? - ✔✔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? - ✔✔A leaking master cylinder primary piston seal. Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - ✔✔relieve brake system pressure according to manufacturer procedures
When would the pump motor be activated in an anti-lcok brake system with traction assist? - ✔✔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? - ✔✔a broken shoe hold-down spring or pin If a drum brake self-adjuster seizes up, the likely result will be: - ✔✔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? - ✔✔brake shoe return springs On a single anchor duo-servo drum brake system, which shoe does most of the braking? - ✔✔secondary shoe Which lining does most of the braking on a leading/trailing brake? - ✔✔primary shoe This tool is used to? - ✔✔Adjust the brake shoes to the drum Which of the following could be a symptom of over-torqued lug nuts? - ✔✔A brake pedal pulsation during braking. Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - ✔✔RR, LR, RF, LF In disc brake caliper assemblies, the "square cut seal" is usually located: - ✔✔In the caliper piston bore When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - ✔✔Compressed air Sliding caliper disc brake pads are kept in adjustment by the - ✔✔Square cut piston seal
All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - ✔✔Clean the master cylinder with a degreasing solvent The brakes of a car tend to drag, which of the following could be the cause? - ✔✔A stuck wheel cylinder or caliper piston When repairing damaged brake line, which of the following is correct? - ✔✔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? - ✔✔A worn primary cup A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - ✔✔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: - ✔✔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? - ✔✔A corroded master cylinder bore A car has a spongy pedal. Which of the following could be the cause? - ✔✔Air in the system. Which of the following is not correct in the procedure for preparing a brake rotor for matching? - ✔✔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? - ✔✔A plugged booster air breather
All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - ✔✔Air in the system An example of an incorrect procedure for replacing brake pads in a disc brake system is: - ✔✔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? - ✔✔The master cylinder If vacuum is present on both sides of the diaphragm in a brake booster: - ✔✔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? - ✔✔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? - ✔✔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: - ✔✔Conventional braking should still be available What information might be found on a brake drum to help a mechanic? - ✔✔The maximum diameter dimension When checking a newly turned drum before putting it back on, you notice a thread-like grooves in the braking surface. Why are the grooves there? - ✔✔The lathe was not adjusted properly when the drum was turned
