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1. drum is chattering on the brake lathe. This could be the result of ANS A missing dampening belt could cause the drum to vibrate while on the lathe. This vibration can cause the drum to bounce on the cutting tip and make a chattering noise. 2. Avehicle equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of the following could be the cause? ANS Low power steering fluid can cause the booster to provide very little if any boost. 3. Which of the following could cause excessive noise while braking? ANS Missing anti-rattle clips could cause excessive noise while braking 4. Avehicle equipped with a "hill holding" option has a abs code. Which two would most likely be used to check the wheel speed sensor ANS A scan tool or oscilloscope can be used to test a signal from a digital wheel speed sensor. 5. The brake system has a soft, sinking pedal with the engine running. The brake fluid level is at the correct height. Which of the following could be the cause? ANS a bypassing master cylinder would cause a low pedal and would not cause a loss of fluid. 6. Refer to the figure above. Technician A says the pins should be driven in with a brass hammer. Technician B says the pins should be lubricated with brake fluid. Who is correct ANS Neither technician is correct. This style of pin should be installed with a torx or hex head socket. 7. Technician A says a hydro-boost system can use the power steering pump to operate the booster. Technician B says a hydro-boost system can use engine vacuum to operate the booster. Who is correct? ANS Only Technician A is correct. A hydro-boost system uses hydraulic pressure to create boost 8. A disc brake caliper is dragging. All of the following could be the cause EXCEPT e master ANS Worn brake pads will not cause the brakes to drag. 9. Which operation is being performed in the illustration above? ANS Th cylinder is being bleed prior to installation. 10. The rear wheels of a front wheel drive car lockup during heavy braking. Technician A says this could be caused by a faulty proportioning valve. Technician B says this could be caused by a faulty brake booster. Who is correct? ANS Technician Ais correct. A faulty proportioning valve could cause the pressure to the rear wheels to be too high and lock the wheels during hard braking. 11. There is a loud growling noise only when the vehicle is steered to the right while driving Which of the following could be the cause? ANS This is a typical wheel bearing noise. 18. Technician A says an analog wheel speed sensor can detect which direc- tion the wheel is turning. Technician B says a digital wheel speed sensor can detect which direction the wheel is turning. Who is correct? ANS Only Technician B is correct. A digital wheel speed sensor can indicate direction by detecting narrow and wide slots on the reluctor ring. 19. All of the following are the result of brake pad burnishing EXCEPT ANS ANS Brake rotors do not need the metal cured. 20. When bench bleeding a master cylinder which statement is true? ANS New brake fluid should be used when bleeding the master cylinder. 21. The technician is preparing to do a brake job on a vehicle equipped with integral ABS. Which of the following should be done? INS The pedal should be pumped 25-40 times to bleed all the pressure from INE: ne accumulator. nly Tech- 22. Refer to the illustration above. braking system (ABS) modulator Technician B says pressure is being tested at the Technician A says is being tested at the antilock combination valve. Who is correct? ANS o nician B is correct. This is a combination valve. 23. A customer has a noise concern coming from the rear of the vehicle. All of the following could be the cause EXCEPT ANS Rear tires out of balance would cause a vibration but not a noisC. 24. A vehicle comes back into the shop with a brake pulsation after having the rotors replaced. Which of the following is the most likely cause? ANS a wheel torque that is too tight could warp the rotors. This could result in dagwnen pulsation. itch would 25. brake warning lamp illustrated in the figure above does not illumin the parking brake is applied. It operates normally otherwise. Which o following could be the cause? ANS An open ground at the parking brake sw prevent the light from illuminating when the parking brake is activated. 26. brake pulsation similar to the A customer is concerned that on dry pave- ment, their vehicle will occasionally have a rapid feel of an ABS stop. Which of the following is the most likely cause? ANS A faulty wheel speed sensor can give false information which may cause ABS activation when it is not needed. 27. The caliper piston seal is leaking. Which of the following would most likely result? ANS The brake pedal would become soft because as the fluid got low, air would enter the system. 28. A vehicle pulls right while braking. The most likely cause would be 34. Which of the following would most likely cause a brake fluid leak ona front disc brake caliper assembly? ANS A faulty seal could cause a leak. 35. All of the following could cause brake pedal pulsation EXCEPT ANS ANS Worn brake pad linings 36. All of the following could cause a brake pedal pulsation EXCEPT ANS ANS pedal pulsation. Worn brake pad linings can cause noise, but will not cause a brake 37. There is a loud growling noise while driving. The noise gets louder when vehicle speed increases. Which of the following could be the cause? ANS This is a typical wheel bearing diagnosis. 38. Which of the following would be the correct way to handle brake fluid? JANE This is the correct procedure. 39. Technician A says rust can cause a faulty wheel speed sensor signal. Technician B says a defective brake switch can cause a faulty wheel speed signal. Who is correct? ANS Only Technician A is correct. Rust can cause the wheel speed sensor to be pushed out of the housing it sits in, and result in a faulty wheel speed sensor signal. 40. A vehicle cquipped with a hydro-boost brake system has a low, soft pedal with little braking action. Which of the following could be the cause? ANS Air in the brake fluid would cause a low, soft pedal. 41. A set of tapered roller bearings are being serviced. Which of the following is true concerning the correct tightening procedure? ANS The final check should be 0.001"-0.005" (0.025mm-0.127mm). 7/27 42. primary reservoir. The brake system has a low, soft pedal with the engine running. The brake fluid is low in the which of the following could be the cause? ANS A leaking master cylinder would cause a low, soft pedal. 43. A brake line needs replaced. Technician A says with compression fittings. Technician B says a new section of line should be installed using an that a new section of line should be installed ISO or double flare. Who is correct? ANS Only Technician B is correct. When a steel brake line fails it should be 44. Which of the following is a typical input to the ABS control module? ANS The brake light switch is a typical input to the ABS control module. 45. Technician A says that brake drag can be caused by worn drums. Techni- cian B says that brak drag can be caused by a seized star-wheel adjuster. Who is correct? ANS Neither Technician is correct. Brake drag can be caused by weak return springs. 46. A vehicle pulls left after the brake pedal is released. This could be caused by ANS ANS A restricted left front brake hose would allow higher pressure from the master cylinder to get to the caliper, but not leave the caliper. This condition would leave the left front caliper applied after the brake pedal is released. 52. Technician A says a double flare line should be replaced with an ISO flare line. Technician B says an ISO flare line should be replaced with a double flare line. Who is correct? ANS Neither Technician is correct. 53. While testing the system shown above, the technician finds there is no assist from the booster fer the engine is shut off. Which of the following is the most likely cause? ANS The accumulator could be faulty and not storing pressure. 54. A customer is concerned that under heavy acceleration on dry pavement the traction control light comes on and the throttle momentarily becomes un- responsive. Which of the following is the most likely cause? ANS When a tire loses traction the control module will reduce power from the engine in an attempt to regain traction. This can result in the customer sensing that the throttle is unresponsive. 55. A vehicle has a low brake pedal, Master cylinder fluid level is correct. Which of following is the most likely cause? ANS When the brake shoes are out of adjustment, the wheel cylinder must push them out further to contact the drum. The master cylinder will have to be pushed in further to accomplish this and will result in low pedal. 56. The brake caliper piston boot was cut when the caliper was reassembled. Technician A says this will cause a brake fluid leak when the caliper is reinstalled. Technician B says this could cause the piston to bind due to con- tamination. Who is correct? ANS Only Technician Bis correct. The boot is designed to prevent contamination of the outside piston area. If the boot is ripped it could result in the piston becoming stuck. 57. Aparking brake cable is binding on a vehicle with front disc and rear drum brakes. This can result in ANS ANS The parking brakes are on the rear; therefore, a binding cable can cause a dragging rear brake. 58. Which of the following is LEAST LIKELY to be an input to the traction control system? ANS The transmission input shaft is not a typical input to the traction control system. 59. After a brake application, the inlet pressure gauge in the figure above drops to normal; however, the outlet pressure gauge remains higher than normal. Which of the following could be the cause? ANS Normally, the outlet pressure gauge would drop along with the inlet pressure gauge unless fluid is being trapped and pressure is building up. The combination valve is restricting flow. The fluid pressure is being trapped by the combination valve; the ddid is not returning to the master cylinder. The combination valve must be replaced. 60. After disc brake pad replacement, the new pads should be burnished. This purpose 1/27 65. When driving a new race of a tapered wheel bearing into the hub, which of the following is true? INS This will fully seat the race in the hub. The sound will change from e ringing sound to a deep thud. Also the hub will tend to bounce when the race is fully inserted 66. The tool shown above is used to ANS ANS This tool is used to compare the drum to the shoes. 67. When the brake line is loosened at the master line no fluid will drip ANS however, when the brake pedal is pulled up fluid will start to drip. Which of the following is indicated? INS The brake pedal may be out of adjustment. The compensating port is being covered until the pedal is lifted. 68. When reinstalling the caliper slide pins, they should be lubricated with ANS ANS - Most manufacturers recommend using a high temperature silicon grease. 69. All of the following would cause the red brake warning lamp (RBWL) to be illuminated EXCEPT ANS ANS Low pressure to the hydraulic brake booster would not cause the red warning light to illuminate. 70. Technician A says lug nuts for steel wheels should be torqued in a star pattern. Technician B says lug nuts for aluminum wheels should be torqued ina circle pattern. Who is correct? JANS Only Technician Ais correct. Lug nuts should be torqued in a star pattern regardless of wheel type. 71. Technician A says the purpose of the traction control deactivation switch is to allow wheel spin in deep snow or mud. Technician B says the purpose of the traction control deactivation switch is to improve fuel economy. Who is correct? INS only Technician A is correct. The switch allows wheel spin for trying to remove a stuck vehicle from deep snow or mud. 72. The brake fluid has been contaminated with oil. Technician A says all rubber hydraulic brake components must be replaced. Technician B says all the antilock braking system (ABS) wheel speed sensors must be replaced. Who is correct? ANS OnlyTechnician A is correct. The oil has contaminated the system and any rubber part which contacts the brake fluid must be replaced. 73. When adjusting the parking brake which of the following is correct? JANS The shoes should be adjusted, then the cable. 74. The traction control lamp stays on continuously on a vehicle. The ABS light is not lit. Which of the following is the most likely cause? JANS The most likely cause is a fault in the traction control module. 75. A says that a master cylinder pushrod that is adjusted too long could cause the brakes to drag. Technician B says that a master cylinder pushrod that is adjusted too long could result in repeat master cylinder failure. Who is right? ANS Both technicians are correct. A master cylinder pushrod that is adjusted too long would cause the compensating port to be covered and not allow for fluid following should the technician do? ANS The hose should be replaced. 81.A vehicle equipped with front disc/rear drum brakes has a binding parking brake cable. This can result in ANS ANS This drum may be difficult to remove, because the shoes are not fully retracted. 82. A customer is concerned that the traction control light flashed on momen- tarily while driving on slick roads. The technician finds no stored diagnostic trouble codes. Which of the following is most likely the cause? ANS When the traction control system activates it is normal for the traction control light to illuminate. This informs the operator that the system is operating. 83. The hydraulic brakes on a car function correctly. However, the vacuum brake booster is not providing any brake assistance. Which of the following could be the cause? ANS Too little vacuum to the booster could cause little or no assistance from the booster. 84. When installing the slide pins on the disc brake caliper the technician finds one hole stripped out. Which of the following is the most economical repair? NS There are many models which have oversized bolts available ANS this is usually the easiest and most economical repair. 85. Technician A says DOT 3 and DOT 5 brake fluid can be mixed in a brake system without any problems. Technician B says DOT 4 and DOT 5 brake fluid can be mixed ina brake system without any problems.Who is correct? ANS Neither Technician is correct. DOT 5 brake fluid cannot be mixed with any other fluid. 86. The proper procedure for adjusting tapered roller wheel bearings used on some drum brake hubs is ANS NS Tapered roller wheel bearings should be tightened while spinning the hub to seat the bearings, and then backed off to the specified amount of end-play. 87. Adrum brake will rotate freely forward but will bind when rotated backward. Which of the following is the most likely cause? ANS A broken return spring on the rear shoe would cause the brake to bind going backward. 88. Refer to the illustration above. The service brakes work correctly; however, the parking brake will not function. Technician A says the problem could be a torn boot. Technician B says the problem could be air in the hydraulic system. Who is correct? ANS Neither Technician is correct. 89. worn much more During a brake inspection on a single piston floating than the outer. Technician A says a binding piston could be the cause. caliper the technician finds the inner pad Technician B says a sticking caliper body could be the cause. Who is correct? ANS OnlyTechnician B is correct. This is a sliding caliper. If the caliper will not slide, the inner pad will do all the braking and the outer pad will not do any. 90. Brake fluid test strips can test the brake fluid for 17/27 ac signal. Who is correct? ANS Neither technician is correct. An analog wheel speed sensor generates an ac waveform, and a digital wheel speed sensor generates a de waveform. 96. The minimum rotor thickness specification is 1.250" (31.75mm). Which of the following measurements would indicate the reusable? ANS 1.520" (38.61mm) This measurement is greater than specification, indicating the rotor is not worn too thin. The specification is for minimum thickness. 97. When the parking brake is released the parking brake pedal fails to return to its most upward position, Technician A says a faulty master cylinder could be the cause. Technician B says air trapped in the brake fluid could be the cause. Who is correct? ANS Neither Technician is correct. A faulty or broken return spring could cause the pedal to fail to fully return. 98. A vehicle with poor brake performance is being tested as shown above. Both pressure gauges are below normal. Which of the following could be the cause? ANS Both gauges are connected to the primary circuit; a leaking primary cup could cause only the primary pressure to be low. 99. A complete brake job including installing a new master cylinder has been performed ona vehicle. After a short test drive all the brakes locked up. Which of the following is the most likely cause? NS The master cylinder was incorrectly installed. antilock The most likely cause is that the master cylinder pushrod was not correctly adjusted. 100. The brake pads need to be replaced on the above system. Which of the following is true? INS The adjusting bolt is retracted to make room for the new pads after the old pads are 19/27 removed and before the new pads are installed. 101. When a customer attempts to apply the parking brake, the pedal travels its full range of motion however the parking brakes do not apply. Technician A says a faulty master cylinder could be the cause. Technician B says air trapped in the brake fluid could be the cause. Who is correct? ANS Neither Technician is correct. This problem could be caused by the rear brakes being out of adjustment. 102. Which of the following is true concerning a non-integral ABS system? ANS - They can use a vacuum brake booster. 103. The tool shown above is used on the ANS ANS This tool is used on the combination valve to hold the metering valve open during bleeding. 104. Refer to the figure above. Which of the following would normally be used to return the piston fully into the caliper bore? ANS A special tool A special adapter, which engages the recess of the piston, is used to turn the piston back into the caliper. 105. The screw threads of the drum brake self adjuster should be lubricated with which of the following? INS Antiseize is the correct lubricant. 20/27 
