ASE B5 Auto Damage Prep Exam Questions & Answers 2026 (11–20)

Question 1

When testing a radiator for internal restrictions, a technician should:

TheoryPractice · Accepted Answer

Use an infrared thermometer to check for cold spots. Using an infrared thermometer to check for temperature differences across the radiator can identify clogged sections, as restricted areas will show cooler temperatures due to reduced coolant flow.

Question 2

A vehicle's auxiliary transmission cooler should be checked when:

TheoryPractice · Accepted Answer

Performing any cooling system service. Since the auxiliary transmission cooler is part of the cooling system and is critical for transmission operation, it should be inspected whenever any cooling system service is performed to ensure proper function.

Question 3

Technician A says that mixing different types of coolant can cause gel formation and system restrictions. Technician B says that all coolant types are compatible as long as they meet manufacturer freeze protection requirements. Who is correct?

TheoryPractice · Accepted Answer

A only. Technician A is correct. Mixing incompatible coolant types (like silicate-based with OAT coolants) can cause chemical reactions resulting in gel formation, which can restrict coolant flow and cause overheating.

Question 4

A vehicle with a belt-driven fan has the fan clutch replaced. After replacement, the cooling system functions properly but the customer complains of poor acceleration. The MOST likely cause is:

TheoryPractice · Accepted Answer

The fan clutch is installed incorrectly. An incorrectly installed fan clutch that's locked or too tight will cause the fan to run constantly at full speed, creating excessive drag on the engine and reducing available power for acceleration.

Question 5

When pressure testing a cooling system, the pressure drops rapidly. Technician A says this could indicate an internal head gasket leak. Technician B says this could indicate a cracked cylinder head. Who is correct?

TheoryPractice · Accepted Answer

Both A and B. Both technicians are correct. Rapid pressure loss during a cooling system pressure test can indicate internal leaks such as a blown head gasket or a cracked cylinder head, both of which would allow pressure to escape into the combustion chambers or oil passages.

Question 6

During post-collision inspection, a technician notices brake fluid leaking from a fitting at the rear wheel. What should be done FIRST?

TheoryPractice · Accepted Answer

Inspect the fitting to determine if it is damaged or just loose. The first step when dealing with a brake fluid leak is to identify the exact source of the leak. Careful inspection of the fitting will determine if it just needs tightening or if components need replacement.

Question 7

Technician A says that DOT 3, DOT 4, and DOT 5.1 brake fluids can be mixed in the same system. Technician B says that DOT 5 (silicone) brake fluid should never be mixed with other DOT fluids. Who is correct?

TheoryPractice · Accepted Answer

Both A and B. DOT 5 silicone fluid should never be mixed with other DOT fluids as they are incompatible. While DOT 3, DOT 4, and DOT 5.1 are all glycol-based and can technically be mixed (though not recommended), DOT 5 is silicone-based and completely incompatible.

Question 8

After replacing a brake caliper following collision damage, the proper sequence for bleeding brakes on a vehicle with four-wheel disc brakes is:

TheoryPractice · Accepted Answer

Right rear, left rear, right front, left front. The proper bleeding sequence is to start with the wheel furthest from the master cylinder (typically right rear) and work toward the closest (typically left front). This helps ensure air is completely removed from the system.

Question 9

When inspecting brake pads after a minor collision, minimum thickness for replacement should be determined by:

TheoryPractice · Accepted Answer

Manufacturer's specifications. The manufacturer's specifications for minimum brake pad thickness should always be consulted to ensure safe brake operation. These specifications vary by vehicle make and model.

Question 10

What can cause brake pedal pulsation after a wheel has been replaced following collision repair?

TheoryPractice · Accepted Answer

Excessive lateral runout in the brake rotor. Lateral runout in a brake rotor causes variations in the rotor's surface that result in brake pedal pulsation. This can occur if a rotor is improperly mounted or damaged during wheel replacement.

ASE B5 Auto Damage Prep Exam Questions & Answers 2026 (11–20)

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