T4 Brakes ASE Exam Question And Correct Answers.

Which of the following could cause the brakes on a truck to wear too fast? A. glazed drums B. wrong linings installed C. Low air pressure D. governor cut out pressure - correct answer B. wrong linings installed which of the following could cause one brake on a truck to wear faster than the others? A. mismatched service brake chambers B. mismatched parking chambers C. low air pressure in service tanks D. governor cut out too low - correct answer A. mismatched service chambers what force is used to apply the foundation brake wheel cylinders? A. hydraulic from the steering reservoir B. mechanical C. electrical D. hydraulic from the master cylinder - correct answer D. there's an audible air leak from under the dash when the foot valve is applied. technician A says the double check valve may be faulty. Tech B says the single check valve may be faulty. who's correct? - correct answer Tech A only on a straight truck equipped with air brake, the secondary tank pressure gauge falls to zero when the wet tank air is drained. Tech A says the one way check valve is faulty, Tech B says the foot valve may be faulty. Who's correct? - correct answer Tech A only. one way check valve protects secondary tank A loose wheel bearing adjustment can cause a faulty wheel speed sensor and a wheel speed sensor code - correct answer Air dryer purges too often. Tech A says the air dryer delivery check Valve may be faulty. Tech B says a leaking wet tank could be the cause. Who's correct? - correct answer C. Both Techs. The safety valve releases on the air tank. Which is the most likely cause? A. plugged line from the supply tank to governor. B. faulty tractor protection valve C. stuck spitter on the air drier D. faulty secondary tank - correct answer A. if the line was plugged, the governor would not unload the compressor A truck with hydraulic disc/drum brakes has a high firm pedal with poor stopping. what could be the cause? - correct answer The brake linings are glazed! Glazed brake linings will allow the pedal to feel high and firm with no stopping power Air builds on a truck in 1.5 minutes. The specs. manual says it should take 3.5 min. Tech A says the air tanks could have water build up. Tech B says the air tanks could have oil built up. Whos correct? - correct answer C. Both technicians. Any Build up reduces volume for stored air Brake fluid is leaking from the rear of a master cylinder on a hydro boost brake system. What is the likely cause? - correct answer Primary seal leaking. Air pressure build up time on a gear driven compressor is greater than specifications. What is the cause? A. a slipping drive B. a leaking service relay C. leaking primary tank D. leaking parking brake chamber - correct answer C. A leaking primary air tank causes extended air build up time air leaks from the left front modulator valve during service operation. There are no ABS codes. What is the cause? - correct answer Modulator Valve seat air is leaking from a quick release valve mounted on the front axle during service application. What is the cause? - correct answer Quick release The three ports on a governor are: - correct answer Reservoir, Unloaded and exhaust Pressure valves open at : - correct answer 150PSI A new drum will not fit over the brake shoes. All the following could be the cause EXCEPT: A. an incorrect drum B. incorrect shoes C. shoes are not properly adjusted D. the parking brake is released - correct answer D. the parking brake is released Air compressor has a broken connecting rod. the compressor crankshaft is not discolored. What is the cause? - correct answer restricted air discharge line all the brakes wear too quick on a truck. what is the cause? - correct answer sticking foot valve - causes brake drag Tech A says brake fluid should be changed every 12 months or 12000 miles. Tech B says brake fluid should be purchased in small containers. Whos correct? - correct answer Tech B. Brake fluid should be bought in small containers and used to prevent moisture built up What can cause oil build up in the air tanks? - correct answer A restricted discharge line - will cause increased compressor heat and can result in compressor oil passing Front brakes on a truck pull when stopping. What can be the cause? - correct answer Mismatched brake linings What can cause brake drag ? - correct answer Excessive S cam radial play - causes lower shoe to drag Super singles can cause excessive vibrations to transfer to the S cam brackets damaging them. - correct answer The S cam has rolled over. What is the cause? - correct answer worn brake drum True or False? ATC uses the ABS hardware to prevent spinning conditions in the drive wheels. - correct answer True A auto slack adjuster will not stay adjusted. Tech A says the problem may be incorrectly installed slack adjuster. Tech B says the problem may be mismatched brake chambers. Whos correct? - correct answer Tech A. Slack adjusters must be installed to OEM specs Tech A says the roller should be lubricated on the shoulder where it contacts the shoe. Tech B says the roller should be lubed where it contacts the face of the S cam. Whos correct? - correct answer Tech A. The roller rotates in the shoe Metal brake linings should be replaced with? - correct answer Steel. Replacement lines are always made of steel An air disc brake will not apply. Air is supply to the brake chamber. Tech A says the caliper slides may be frozen. Tech B says the adjuster mechanism may be frozen. Whos correct? - correct answer Tech A.