ASE T5 Truck Suspension Prep Exam Questions & Answers 2026 (21–30)

Question 1

A truck with air suspension is sitting noticeably lower on the right side. Technician A says to check the air bags for leaks. Technician B says to check the height control valve for proper operation. Who is right?

TheoryPractice · Accepted Answer

Both Technician A and B. Both technicians are correct. Air bags can develop leaks that prevent proper inflation, and height control valves regulate air flow to maintain proper ride height. Both components should be inspected when diagnosing uneven air suspension height.

Question 2

When inspecting a fifth wheel, a technician finds excessive movement in the pivot pins. What is the most likely cause?

TheoryPractice · Accepted Answer

Worn bushings. Worn bushings are the most likely cause of excessive movement in the fifth wheel pivot pins. The bushings provide the bearing surface for the pins, and when they wear, the pins develop excessive play.

Question 3

A driver reports that the truck bounces excessively over bumps. Technician A says to check the shock absorbers for leaks. Technician B says to check for broken leaf springs. Who is right?

TheoryPractice · Accepted Answer

Both Technician A and B. Both technicians are correct. Leaking shock absorbers cannot properly dampen suspension movement, causing excessive bouncing. Similarly, broken leaf springs can compromise the suspension's ability to properly support the vehicle, resulting in bouncing over bumps.

Question 4

During inspection of a truck's frame, what does elongated mounting holes typically indicate?

TheoryPractice · Accepted Answer

Excessive component movement. Elongated mounting holes in a truck frame typically indicate that there has been excessive movement of components, causing the holes to wear and stretch over time. This is often due to loose fasteners that allowed components to shift during operation.

Question 5

When replacing kingpins on a front axle, which of these procedures is most important?

TheoryPractice · Accepted Answer

Reaming the bushings after installation. Properly reaming the bushings after installation is critical to ensure the correct fit of the kingpin. If the bushings are not properly reamed, the kingpin may bind or have excessive play, affecting steering performance and component life.

Question 6

A driver complains of poor ride quality with a truck that has leaf springs. Technician A says that misaligned spring center bolts could cause this condition. Technician B says that worn spring hanger bushings could cause this condition. Who is right?

TheoryPractice · Accepted Answer

Both Technician A and B. Both technicians are correct. Misaligned spring center bolts can affect how the leaf spring flexes and functions, while worn spring hanger bushings allow excess movement in the suspension system. Both conditions can contribute to poor ride quality.

Question 7

A technician notices hairline cracks in a truck frame near the spring hangers. What is the most appropriate repair action?

TheoryPractice · Accepted Answer

Stop-drill the ends of the cracks and install reinforcement plates. Hairline cracks in a truck frame require stop-drilling the ends of the cracks to prevent further propagation, followed by proper reinforcement plates and welding according to manufacturer specifications to restore frame integrity.

Question 8

What component is responsible for maintaining proper axle spacing and alignment in a walking beam suspension system?

TheoryPractice · Accepted Answer

Torque rods. Torque rods (also called radius rods) maintain proper axle spacing and alignment in walking beam suspensions by controlling the fore and aft movement of the axles while allowing the walking beam to pivot properly.

Question 9

A sliding fifth wheel is difficult to adjust. Technician A says to check for bent slide rails. Technician B says to check for debris in the slide path. Who is right?

TheoryPractice · Accepted Answer

Both Technician A and B. Both technicians are correct. Bent slide rails can impede the movement of a sliding fifth wheel, and debris accumulated in the slide path can also cause binding or difficulty in adjustment. Both issues should be inspected when a fifth wheel is difficult to slide.

Question 10

When inspecting a truck's stabilizer bar, what condition would indicate that replacement is necessary?

TheoryPractice · Accepted Answer

Cracked or broken mounting brackets. Cracked or broken mounting brackets on a stabilizer bar indicate that replacement is necessary. The mounting brackets secure the stabilizer bar to the vehicle frame, and if cracked or broken, the stabilizer bar cannot function properly to control body roll.

ASE T5 Truck Suspension Prep Exam Questions & Answers 2026 (21–30)

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