SOS Mechanic Certification- Brakes Exam Questions and Answers 2024

18. Upon inspecting brake fluid condition, the technician observes the di- aphragm in the master cylinder 

cup is swollen. Which of the following is the most likely cause?: silicone fluid added to the system 

19. When inspecting brake fluid levels, a technician observes low fluid levels. which of the following should 

be done first?: Inspect disc brake pads for exces- sive wear 

20. 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 

21. Which of the following is true about bleeding brake lines on most ABS 

equipped vehicles?: Most ABS brake lines can be bled like a conventional 

(non-ABS) system. However, caution must be taken because of the extreme pres- sure. 

22. Most anti-lock brake systems require the removal of the pressure modu- lator fuse when:: a "spaced-

saver" spare tire is being used and mismatched tires are being installed 

23. What does a load sensing proportioning valve do?: It increases the hydraulic pressure during braking at the 

rear wheel cylinders when the vehicle is loaded 

24. The brakes of a car squeal each time they are applied, which of the following is the LEAST likely 

source of the noise?: Glazed brake pads 

25. Which of the following is a true statement about proportioning valves?:   - 

They provide better braking balance during hard stops 

26. A properly functioning load sensing proportioning valve will:: cause an increase in the hydraulic 

pressure during braking at the rear wheel cylinders when the vehicle is loaded. 

27. Why don't disc brake system usually need adjustment?: A certain amount of pressure is maintained by 

the metering valve 

28. The front brakes of a car equipped with disc brakes in the front and drum brakes in the rear, grab 

quickly as light pressure is applied to the brake pedal, which of the following could be the cause of the 

problem?: Defective metering valve 

29. The brake warning light on the dash stays on all the time, which of the following could be the cause of 

the problem?: A problem in the hydraulic circuit 

30. Which of the following would be the LEAST likely cause for an intermittent problem in an ABS 

system?: Open wheel sensor circuit 

31. 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. 

32. Which of the following incorrect service procedures could cause brake pedal pulsation?: incorrect run-

out on the car brake lathe 

33. What type of rotor surface provides the best braking with new pads?: A 

smooth, flat surface 

34. which of the following is a quick way to isolated a defective master cylin- der? 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. 

35. A common cause of pedal pulsation during brake application is:: NOT 

caused by improperly torqued wheels, damaged backing plates, or lubricated shims 

36. 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 

37. 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 

38. Wheel speed sensors:: send an A/C signal to the control module 

39. Which of the following incorrect service procedures will cause brake lock up?: Master Cylinder push 

rod adjusted too long 

40. 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. 

41. Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first:: relieve brake 

system pressure according to manufacturer procedures