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Automobile & Light Truck Certification Test A5 Brakes practice questions

216 free questions with answers and explanations.

Practice test
  1. 151.During a drum brake service, a technician notices that the automatic brake adjuster star wheel is seized and cannot be turned. The brake shoes are worn, but not excessively. What is the MOST likely consequence of this seized adjuster on vehicle braking performance?Drum Brake Diagnosis and Repair
  2. 152.A vehicle owner reports that their parking brake feels very loose and barely holds the vehicle on an incline. During inspection, the technician confirms excessive parking brake cable slack. After ensuring the rear drum brakes are correctly adjusted and in good condition, what is the MOST appropriate next step?Drum Brake Diagnosis and Repair
  3. 153.A customer complains of a noticeable vibration and noise from the rear of their vehicle when the parking brake is applied, but not when the service brakes are used. The vehicle has rear disc brakes with an integrated drum-in-hat parking brake. What is the MOST likely cause?Disc Brake Diagnosis and Repair
  4. 154.A technician is diagnosing a vehicle with a loud grinding noise coming from the front brakes during light braking. The noise disappears under heavy braking. Inspection reveals that the brake pads are moderately worn, and the rotors appear smooth with no deep grooves. What is the MOST likely cause of this intermittent grinding noise?Disc Brake Diagnosis and Repair
  5. 155.A customer complains of a grinding noise coming from the rear brakes during light to moderate braking. Upon inspection, the technician finds that the rear brake pads are severely worn, and the backing plates are scraping against the rotors. The vehicle is equipped with a hat-type parking brake system. What is the MOST likely reason the customer did not notice this issue earlier with the parking brake?Disc Brake Diagnosis and Repair
  6. 156.A vehicle owner complains of a burning smell and reduced braking performance after a short drive. Upon inspection, one of the rear wheels is significantly hotter than the others, and the disc rotor shows signs of discoloration. Which of the following is the most probable cause?Disc Brake Diagnosis and Repair
  7. 157.A technician is installing new brake pads on a vehicle equipped with a single-piston floating caliper. After installation, the technician notices that the inner brake pad is dragging slightly against the rotor while the outer pad has sufficient clearance. What is the MOST likely cause?Disc Brake Diagnosis and Repair
  8. 158.During a brake inspection, a technician observes fine, hairline cracks radiating from the lug nut holes on a vehicle's brake rotor. The vehicle owner reports no current braking issues. What is the MOST appropriate action for the technician to take?Disc Brake Diagnosis and Repair
  9. 159.A vehicle with an integrated electric parking brake (EPB) system requires rear brake pad replacement. After physically removing the caliper, what essential step must be performed using a scan tool before the pistons can be safely retracted?Disc Brake Diagnosis and Repair
  10. 160.A customer complains that their vehicle's parking brake does not hold the vehicle securely on an incline. The vehicle is equipped with a rear disc brake system with an integrated drum-style parking brake (hat-type). What is the MOST likely cause?Disc Brake Diagnosis and Repair
  11. 161.A customer reports that their vehicle pulls sharply to the left when the brakes are applied. The technician verifies the complaint and finds no obvious fluid leaks or unusual noises. Which of the following is the most likely cause?Disc Brake Diagnosis and Repair
  12. 162.A technician is performing a pre-purchase inspection on a used vehicle. They observe significant grooving and scoring on the front brake rotors, along with a noticeable lip on the outer edge. Which of the following is the MOST appropriate recommendation?Disc Brake Diagnosis and Repair
  13. 163.A technician is performing a disc brake service and notices that the brake rotor has a small, hairline crack extending from one of the lug stud holes towards the outer edge. The crack is less than 1 inch long. What is the MOST appropriate action?Disc Brake Diagnosis and Repair
  14. 164.A customer complains that their vehicle's electric parking brake (EPB) engages and disengages slowly, and sometimes fails to release fully, causing a slight drag. There are no warning lights on the dashboard. What is the MOST likely cause of this issue?Disc Brake Diagnosis and Repair
  15. 165.A customer reports a squealing noise from the front brakes only when the brakes are NOT applied. The noise stops as soon as the brake pedal is lightly pressed. Which of the following is the most probable cause?Disc Brake Diagnosis and Repair
  16. 166.When inspecting a disc brake system, a technician observes a small amount of brake fluid weeping from around the caliper piston boot. The brake pedal feels firm, and there are no other apparent braking issues. What is the most appropriate action?Disc Brake Diagnosis and Repair
  17. 167.A technician is installing new brake pads on a vehicle with a single-piston floating caliper. After installing the pads and reassembling the caliper, they notice that the caliper is very tight against the rotor, making it difficult to rotate the wheel by hand. What is the most likely cause of this issue?Disc Brake Diagnosis and Repair
  18. 168.A technician is performing a disc brake service and notes that the vehicle's brake rotors exhibit excessive runout. What is the maximum allowable runout for most passenger vehicle brake rotors before replacement or machining is recommended?Disc Brake Diagnosis and Repair
  19. 169.A customer complains that their vehicle's electric parking brake (EPB) will not disengage after being applied. The technician connects a scan tool and finds no diagnostic trouble codes (DTCs). Which of the following is the MOST likely cause?Disc Brake Diagnosis and Repair
  20. 170.A technician is preparing to replace the front brake pads on a vehicle. After removing the wheel, they observe that the caliper piston is fully extended and the inner brake pad is completely worn, while the outer pad shows minimal wear. The caliper is a single-piston floating type. What is the MOST likely cause of this condition?Disc Brake Diagnosis and Repair
  21. 171.A technician is inspecting a vehicle with a complaint of a squealing noise from the front brakes only when the brakes are applied. The noise is consistent and high-pitched. Which of the following is the MOST likely cause?Disc Brake Diagnosis and Repair
  22. 172.During a brake inspection, a technician notices that the driver's side front brake rotor has a distinct blue tint and several hard spots, while the passenger's side rotor appears normal. What does the blue discoloration and hard spots on the driver's side rotor indicate?Disc Brake Diagnosis and Repair
  23. 173.A technician is performing a brake flush on a vehicle with ABS. After completing the flush using a pressure bleeder, the technician notices that the brake pedal still feels somewhat soft and spongy. No external leaks are present. What is the MOST probable next step?Disc Brake Diagnosis and Repair
  24. 174.During a brake pad replacement, a technician encounters a caliper piston that is very difficult to compress back into its bore. The hydraulic system was opened and the bleeder screw was open during this attempt. What is the most likely cause?Disc Brake Diagnosis and Repair
  25. 175.A technician is inspecting a vehicle's disc brake system. They notice that the brake pads on one side of the caliper are significantly more worn than the pads on the other side. Which of the following is the most likely cause of this uneven pad wear?Disc Brake Diagnosis and Repair
  26. 176.While replacing brake pads, a technician attempts to compress a single-piston caliper piston using a C-clamp, but it resists compression significantly. After opening the bleeder screw, the piston compresses easily. What does this indicate?Disc Brake Diagnosis and Repair
  27. 177.A technician is inspecting a vehicle's disc brake system. They notice that the brake pads on one side of a floating caliper are significantly more worn than the pads on the other side. Which of the following is the MOST likely cause of this condition?Disc Brake Diagnosis and Repair
  28. 178.A vehicle owner complains that their parking brake handle requires excessive effort to engage and still does not hold the vehicle securely. The technician visually inspects the cables and finds no obvious damage. What is the MOST likely cause of this condition?Disc Brake Diagnosis and Repair
  29. 179.During a routine brake inspection, a technician notes that the brake pad material on one side of a fixed caliper system is significantly thinner than the pad on the opposite side. The vehicle is equipped with a dual-piston fixed caliper. What is the MOST probable cause of this uneven wear?Disc Brake Diagnosis and Repair
  30. 180.A technician is replacing brake pads on a vehicle with a single-piston floating caliper. After removing the old pads, they notice that the inner brake pad is significantly thicker than the outer brake pad. All other brake components appear to be in good condition. What is the MOST likely cause for this uneven wear?Disc Brake Diagnosis and Repair
  31. 181.A technician is installing new brake pads and rotors on a vehicle. After installation, they notice that the new pads are making light contact with the rotor even when the brake pedal is not applied, causing a slight drag. All components are new and installed correctly. Which of the following is the MOST likely cause?Disc Brake Diagnosis and Repair
  32. 182.A technician is performing a pre-purchase inspection on a used vehicle. They observe that the front brake rotors have a slight blue discoloration near the outer edge and small, localized hard spots (glazing) on the friction surface. The current brake pads are ceramic. What do these observations MOST likely indicate?Disc Brake Diagnosis and Repair
  33. 183.A vehicle owner complains of a loud grinding noise and vibration during braking, especially at higher speeds. The technician inspects the front brakes and finds that the brake pads are worn down to the backing plates and have severely scored the rotors. What is the MOST immediate action the technician should take?Disc Brake Diagnosis and Repair
  34. 184.A customer complains of a pulsation felt through the brake pedal during moderate to heavy braking. The technician inspects the front brakes and finds no signs of excessive runout or thickness variation on the rotors. What other component should be closely inspected for causing this pulsation?Disc Brake Diagnosis and Repair
  35. 185.A technician is performing a brake inspection and notices that the brake pads on the inner side of a fixed caliper are significantly more worn than the outer pads. Which of the following is the MOST likely cause?Disc Brake Diagnosis and Repair
  36. 186.A vehicle exhibits a brake pulsation felt through the pedal and steering wheel during moderate braking. The technician measures the rotor runout and finds it to be within manufacturer specifications. What is the MOST likely cause of this pulsation?Disc Brake Diagnosis and Repair
  37. 187.A vehicle exhibits a soft or spongy brake pedal, and the technician suspects air in the hydraulic system. After bleeding the brakes at all four wheels, the pedal feel improves but is still not firm. Which of the following is an additional step that should be performed, especially on vehicles with ABS, to ensure complete air removal?Disc Brake Diagnosis and Repair
  38. 188.A technician is performing a brake inspection on a vehicle with a complaint of a 'soft' or 'spongy' brake pedal. The master cylinder is full, and there are no external leaks. After bleeding the system at all four wheels using the conventional method, the pedal feel improves slightly but is still not firm. The vehicle is equipped with an Anti-lock Braking System (ABS). What should be the NEXT step in diagnosing and repairing this issue?Disc Brake Diagnosis and Repair
  39. 189.A customer complains of a 'clunking' noise from the front end when applying the brakes, especially when backing up and then moving forward, or vice-versa. The brake pads and rotors were recently replaced. What is the MOST likely cause?Disc Brake Diagnosis and Repair
  40. 190.A customer complains of a grinding noise coming from the front brakes. During inspection, the technician finds that the outer brake pad on the passenger side is completely worn down to the backing plate, while the inner pad has significant friction material remaining. Which of the following is the most probable cause?Disc Brake Diagnosis and Repair
  41. 191.A technician is performing a brake system flush. After flushing the system, a pressure test reveals that the residual pressure valve in the master cylinder is stuck open. What effect would this have on the disc brake system?Disc Brake Diagnosis and Repair
  42. 192.After performing a brake job that included new pads and rotors, a technician notices that the brake pedal requires excessive force to stop the vehicle, even though the pedal feel is firm. The vehicle previously had good braking performance. What is the MOST likely cause?Disc Brake Diagnosis and Repair
  43. 193.A customer complains that their vehicle's rear brakes make a loud grinding noise when applied. Upon inspection, the technician finds that the brake drum has deep, concentric grooves and metallic particles embedded in the drum surface. What is the MOST likely cause of this condition?Drum Brake Diagnosis and Repair
  44. 194.A technician is diagnosing a vehicle with an ABS warning light illuminated. The scan tool reports a C0040 fault code, indicating a 'Right Front Wheel Speed Sensor Circuit Malfunction'. Upon inspection, the technician finds the wheel speed sensor wiring harness appears visually intact, but an ohmmeter test across the sensor terminals shows an open circuit. What is the MOST likely cause of this fault?Anti-lock Brake System (ABS) Diagnosis and Repair
  45. 195.A technician is performing a pre-inspection of a drum brake system. They notice significant rust on the braking surface of the drum, but the drum shows no signs of scoring, cracking, or excessive wear. What is the MOST appropriate action?Drum Brake Diagnosis and Repair
  46. 196.A technician is performing a drum brake service. After removing the drum, they notice that the brake shoe hold-down springs appear weak and stretched. What is the MOST likely consequence of this condition?Drum Brake Diagnosis and Repair
  47. 197.A technician is performing a brake inspection. They notice a bulge or swelling on a flexible rubber brake hose near the caliper. What is the MOST likely consequence of this condition?Hydraulic System Diagnosis and Repair
  48. 198.A technician is inspecting a vehicle's brake system and notices that the brake fluid in the reservoir is dark and has a burnt smell. What is the most likely cause for this condition?Hydraulic System Diagnosis and Repair
  49. 199.A technician is performing a diagnostic on a vehicle with a complaint of a soft brake pedal and excessive travel. During inspection, they find that the brake fluid reservoir is consistently low, requiring frequent topping off. There are no visible external leaks from the lines, calipers, or master cylinder. What is the MOST likely cause of the recurring low fluid level and soft pedal?Hydraulic System Diagnosis and Repair
  50. 200.A vehicle equipped with Electronic Stability Control (ESC) is experiencing an intermittent ABS warning light and a C1223 fault code, indicating a 'Yaw Rate Sensor Circuit Malfunction'. Which of the following is the PRIMARY function of the yaw rate sensor in an ESC system?Anti-lock Brake System (ABS) Diagnosis and Repair