ASE BRAKES T4 PRACTICE TEST #1 QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2026

ASE BRAKES T4 PRACTICE TEST #1 QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2026 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 in the service tanks D. Governor cut-out pressure too high - Answers Answer A is incorrect. Glazed drum linings are hard and do not wear. They also do not stop the truck. Answer B is correct. The wrong lining for the application may be the problem. Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a low amount of reserve air in case of multiple brake applications. Answer D is incorrect. High governor cut=out pressure may cause the safety valve to open, but would not cause the brakes to wear too fast. Which of the following could case one brake on a truck to wear faster than the others? A. Mismatched service brake chambers B. Mismatched parking brake chambers C. Low air pressure in the service tanks D. Governor cut-out pressure too low - Answers Answer A is correct. Mismatched brake service chambers would apply unequal brake application pressure from side to side, which would cause one brake to wear faster. Answer B is incorrect. Mismatched parking brake chambers would not cause brake wear. It would possibly allow the brake to roll when parked, because one side could have insufficient parking brake application. Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a low amount of reserve air in case of multiple brake applications Answer D is incorrect. Low governor cut-out pressure may cause an inadequate amount of air in reserve but would not cause the brake to wear too fast. There is an audible air leak from under the dash when the foot valve is applied. Technician A says the double-check valve may be faulty. Technician B says the single-check valve may be faulty. Who is correct? - Answers A. A only B. B only C. Both A and B D. Neither A nor B Answer A is correct. A leaking double check valve could allow air to flow to the foot valve and out the open exhaust Answer B is incorrect. Single check valves are used to protect the tanks. They do not cause an air leak when the brakes are applied. Answer C is incorrect. Technician B is incorrect. Answer D is incorrect. Technician A is correct. On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero when she wet air tank is drained. Technician A says the one-way check valve may be faulty. Technician B says the foor valve may be faulty. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B - Answers Answer A is correct. The one way check valve should protect the secondary tank. The check valve is leaking. Answer B is incorrect. The foot valve does not separate the wet and secondary tanks. Answer C is incorrect. Technician B is incorrect. Answer D is incorrect. Technician A is correct. Which of the following could set an antilock braking system (ABS) wheel speed sensor code: A. Faulty modulator hold solenoid B. Faulty modulator release solenoid C. Incorrect wheel bearing adjustment D. Incorrect brake adjustment - Answers Answer A is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could cause a modulator valve code. Answer B is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could cause a modulator valve code Answer C is correct. A loose wheel bearing adjustment can cause a faulty wheel speed sensor and a wheel speed sensor code. Answer D is incorrect. An incorrect brake adjustment may cause a dragging brake but would not cause a wheel speed sensor code The air drier purged too often. Technician A says the air drier delivery check valve may be leaking. Technician B says a leaking wet tank could be the cause. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B - Answers Answer A is incorrect. Technician B is also correct. Answer B is incorrect. Technician A is also correct. Answer C is correct. A leaking air drier check valve will allow the wet tank to drain back through the air drier. This will cause air pressure to drop to governor cut-in rapidly. The air compressor will again build tank pressure and unload, and the sequence will start over. A leaking wet tank will cause the air pressure to fall rapidly and the compressor to build air again and then cut out. This too will cause the air drier to purge often. Answer D is incorrect. Both technicians are correct. The safety valve releases on the air tank. Which of the following is the most likely cause? A. Plugged line from the supply tank to the governor B. Faulty tractor protection valve C. Stuck spitter on the air drier D. Faulty secondary tank - Answers Answer A is correct. If the line from the supply tank to the governor were plugged the governor would not unload the compressor. Answer B is incorrect. The tractor protection valve could not cause excessive pressure. Answer C is incorrect. A stuck spitter would prevent the air drier from purging. Answer D is incorrect. A faulty secondary tank could leak, but that would not cause excessive air pressure. A truck with hydraulic disc/drum brakes has a high firm pedal with poor stopping. Which of the following could be the cause? A. The brakes are adjusted too loose. B. The brake linings are glazed. C. The brake pedal pushrod is too long. D. The driveline parking brake is misadjusted. - Answers Answer A is incorrect. If drum brakes are adjusted too loose the pedal will be low because the pedal will need to travel farther to take up the clearance. Answer B is correct. Glazed brake linings will not create the friction needed to stop the truck but will allow the pedal to feel high and firm. Answer C is incorrect. A pushrod that is too long would cause the brakes to drag. Answer D is incorrect. The driveline parking brake adjustment would not cause a low pedal. It is not connected to the service brakes. Air pressure builds up on a truck in 1.5 minutes. The specification manual says it should take 3.5 minutes. Technician A says the air tanks could have water buildup. Technician B says the air tanks could have oil buildup. Who is correct? A. A only B. Bonly C. Both A and B D. Neither A nor B - Answers Answer A is incorrect. Both technicians are correct. Answer B is incorrect. Both technicians are correct. Answer C is correct. Oil or water buildup will reduce the volume and result in a decreased air buildup time. Answer D is incorrect. Both technicians are correct. Brake fluid is leaking from the rear of a master cylinder on a truck equipped with hydro-boost brakes. Which of the following is the most likely cause? A. By-passing master cylinder B. Primary seal leaking C. Secondary seal leaking D. Brake booster leaking - Answers Answer A is incorrect. A by-passing master cylinder does not create an external leak; it creates a low pedal. Answer B is correct. A primary seal leaking would create a leak here. Answer C is incorrect. A secondary seal leak causes an internal leak Answer D is incorrect. A brake booster does not leak brake fluid. Air pressure buildup time on a truck equipped with a gear-driven air compressor is greater than specification. Which of the following is the most likely cause? A. A slipping drive B. A leaking service relay valve C. A leaking primary air tank D. A leaking parking brake chamber - Answers Answer A is incorrect. A gear-driven compressor drive may knock, but it does not usually slip. It either works or it does not turn the compressor at all. Answer B is incorrect. The service relay valve is not activated during the air pressure buildup test. Answer C is correct. A leaking primary air tank will cause extended air pressure build time. Answer D is incorrect. The parking brakes do not have air during the compressor build time test. Air leaks from the left-front modulator valve during a service brake application. There are no ABS codes. Which of the following could be the cause? A. Service relay B. Parking brake relay C. Modulator valve D. Brake chamber - Answers Answer A is incorrect. The service relay will not cause air to leak from the modulator valve. Answer B is incorrect. The parking brake relay will not cause the modulator valve to leak. Answer C is correct. A leaking seat on the modulator valve could cause it to leak. Answer D is incorrect. The brake chamber will not cause the modulator valve to leak when the service brakes are applied. Air is leaking from the quick-release valve mounted on the front axle during a service brake application. Which of the following could be the cause? A. Service relay B. Parking brake relay C. Quick release D. Brake chamber - Answers Answer A is incorrect. The service relay will not cause air to leak from the quick-release valve Answer B is incorrect. The parking brake relay will not cause the quick release valve to leak. Answer C is correct. A leaking seat on the valve could cause it to leak. Answer D is incorrect. The brake chamber will not cause the quick-release valve to leak when the service brakes are applied The three ports on a governor are: A. Reservoir, unloader, exhaust. B. Reservoir, supply, exhaust. C. Reservoir, primary, secondary. D. Primary, secondary, exhaust - Answers Answer A is correct. The reservoir connects to the supply tank, the unloader to the air compressor, and the exhaust to the atmosphere. Answer B is incorrect. The three ports are reservoir, unloader, and exhaust. Answer C is incorrect. The three ports are reservoir, unloader, and exhaust. Answer D is incorrect. The three ports are reservoir, unloader, and exhaust The pressure valve mounted on the tanks will open and vent air pressure at: A. 100 psi. B. 120 psi. C. 135 psi. D. 150 psi. - Answers Answer A is incorrect. Most safety valves are set to open at 150 psi. Answer B is incorrect. Most safety valves are set to open at 150 psi. Answer C is incorrect. Most safery valves are set to open at 150 psi. Answer D is correct. Most safety valves are set to open at 150 psi A new drum will not fit over the brake shoes. All of the following could be the cause EXCEPT: A. An incorrect drum. B. Incorrect shoes. C. The shoes are not properly adjusted. D. The parking brake is released - Answers Answer A is incorrect. The wrong drum could cause it not to fit. Answer B is incorrect. The wrong shoes could cause the drum not to fit. Answer C is incorrect. The shoes adjusted too far out could cause the drum not to fit. Answer D is correct. The parking brake should be released when the drum is installed An air compressor has a broken connecting rod; the compressor crankshaft is not discolored. This is the second air compressor to have this failure on this truck. Which of the following could be the cause? A. Restricted oil drain line B. Restricted oil supply line C. Restricted air intake line D. Restricted air discharge line - Answers Answer A is incorrect. A restricted oil drain line floods the compressor crankcase and causes the compressor to pass oil. Answer B is incorrect. A restricted oil supply line would cause the crankshaft to be discolored due to overheating. Answer C is incorrect. A restricted air intake would cause the compressor to build air slowly and to pass oil. Answer D is correct. A restricted air discharge line could cause excess pressure on top of the compressor piston and a broken connecting rod. This would not overheat the compressor crankshaft. All the brakes wear too quickly on a truck. Which of the following could be the cause? A. Sticking hand valve B. Sticking foot valve C. Governor cut-out pressure set too high D. Governor cut-in pressure set too low - Answers Answer A is incorrect. A sticking hand valve would cause only the trailer brakes to drag. Answer B is correct. A sticking foot valve could cause all the brakes to drag. Answer C is incorrect. Excessive cut-out pressure could cause the safety valve to open but would not cause the brakes to wear too fast. Answer D is incorrect. Governor cut-in pressure lower than specification could cause a low reserve but would not cause the brakes to wear too fast. Technician A says brake fluid should be changed every 12 months or 12,000 miles. Technician B says brake fluid should be purchased in small containers. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B - Answers Answer A is incorrect. Most original equipment manufacturers (OEMs) recommend brake fluid exchange every two or three years. Answer B is correct. Brake fluid should be purchased in small containers and used soon after opening in order to prevent unused brake fluid sitting and collecting moisture. Answer C is incorrect. Technician B is correct. Answer D is incorrect. Technician B is correct. Which of the following could cause oil buildup in the air tanks? A. Restricted oil supply to the air compressor B. Restricted air compressor discharge line C. Restricted turbocharger oil supply line D. Air drier serviced too often - Answers Answer A is incorrect. A restricted oil supply would starve the air compressor. Answer B is correct. A restricted air compressor discharge line will cause increased compressor temperatures and can result in compressor oil passing. Answer C is incorrect. A restricted turbo oil supply will cause turbo bearing damage. Answer D is incorrect. Servicing the air drier too often will not affect compressor oil passing. The front brakes on a truck pull when stopping. Which of the following could cause this? A. Mismatched brake chambers B. Faulty double-check valve C. Stuck quick-release valve D. Stuck relay valve - Answers Answer A is correct. Mismatched brake chambers would cause one side to have more surface area and therefore unequal braking. This could cause a pull.