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Automotive Service · MIL4

ASE Chassis Practice Test

Chassis service focuses on the systems that control a vehicle’s direction, stopping, and connection between the powertrain and wheels. This practice set samples brake hydraulics and components, steering alignment, anti-lock braking system checks, driveshaft universal joints, and safe undercarriage work. Questions emphasize selecting appropriate inspection or service steps from observed symptoms and measurements.

Exam overview

Exam providerNational Institute for Automotive Service Excellence
Exam codeMIL4
CategoryAutomotive Service

About the ASE Chassis Exam

Chassis technicians connect symptoms to mechanical condition and safe repair procedures. Brake questions involve pedal feel, booster operation, fluid level changes as pads wear, rotor-thickness measurements, proportioning valves, and initial checks when an ABS warning lamp is on. Steering and suspension work requires distinguishing an off-center steering wheel from vehicle pull and choosing a suitable alignment-related service step. Driveline inspection includes identifying looseness and impact noises at universal joints when torque changes. Wheel service also depends on tightening lug nuts in a crisscross pattern to the specified torque, while lift work requires secure support before anyone goes underneath. These tasks draw on systematic inspection, interpretation of test results, recognition of safety concerns, and selection of repairs that address the cause rather than only the symptom.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

A brake pedal feels spongy after a hydraulic component was replaced. Which service step is most appropriate?

  1. ABleed the brake hydraulic system using the specified procedure
  2. BIncrease tire pressure at the front wheels
  3. CAdjust front toe to specification
  4. DLubricate the brake pedal pivot only
Show answerCorrect answer: A

Air trapped in the hydraulic lines compresses under pedal force and can produce a spongy pedal. Bleeding removes air, following the vehicle maker's procedure.

Question 2

A vehicle's steering wheel is off-center when driving straight, although the vehicle does not drift on a level road. Which service step is most appropriate?

  1. ACenter the steering wheel as part of a properly performed alignment
  2. BReplace the brake master cylinder
  3. CIncrease rear tire pressure above the placard specification
  4. DAdjust wheel-bearing preload without inspection
Show answerCorrect answer: A

An off-center steering wheel with otherwise straight tracking commonly calls for correcting steering-wheel centering during a four-wheel alignment, following vehicle-specific procedures.

Question 3

A vehicle equipped with an anti-lock braking system has an ABS warning lamp illuminated, but the ordinary brake pedal feels normal. What is the best initial approach?

  1. ARetrieve ABS fault information and inspect the indicated system components
  2. BAssume the hydraulic brakes have no function and replace the master cylinder immediately
  3. CDisconnect the warning lamp so it cannot illuminate
  4. DAdjust the steering wheel position
Show answerCorrect answer: A

An illuminated ABS warning indicates a fault that should be diagnosed using the appropriate scan and inspection procedures. Conventional braking may remain available, but ABS operation may be limited or disabled until repaired.

Question 4

A technician is measuring brake rotor thickness. Why should measurements be taken at several points around the rotor, away from the outer edge?

  1. ATo detect thickness variation and avoid measuring the unworn outer lip
  2. BTo determine the wheel-bearing preload without disassembly
  3. CTo measure the rotor’s center-to-center bolt spacing
  4. DTo verify that the brake-fluid boiling point is adequate
Show answerCorrect answer: A

Multiple thickness readings can reveal thickness variation around the rotor. Measuring away from the outer lip avoids including a ridge that may remain unworn and produce a misleading reading.

Question 5

A vehicle is equipped with a brake proportioning valve. What is its general purpose in a conventional hydraulic brake system?

  1. ALimit rear brake pressure under certain conditions to help reduce rear-wheel lockup
  2. BIncrease steering-assist pressure when the engine speed rises
  3. CMaintain constant pressure in the windshield-washer system
  4. DAdjust the parking-brake cable length automatically
Show answerCorrect answer: A

A proportioning valve reduces or limits rear hydraulic pressure relative to front pressure under specified braking conditions. This helps maintain braking balance and reduce the likelihood of rear-wheel lockup.

Question 6

A vehicle's brake-fluid level is below the minimum mark, and the brake pads are significantly worn. No leak is found. Why can pad wear contribute to a lower reservoir level?

  1. AAs caliper pistons extend to compensate for pad wear, more fluid remains in the calipers
  2. BWorn pads cause the master cylinder to evaporate fluid
  3. CPad wear increases the amount of fluid stored in the brake booster
  4. DThe ABS module intentionally vents fluid during every stop
Show answerCorrect answer: A

As disc-brake pads wear, caliper pistons sit farther out to maintain pad contact, so more fluid is displaced from the reservoir into the calipers. A low level still warrants checking for leaks and evaluating the brakes before topping up.

Question 7

A technician is inspecting a rear-wheel-drive vehicle’s driveshaft. The universal joint has noticeable looseness and produces a clunk when the driveline load changes. What is the appropriate action?

  1. ALubricate the joint and assume the looseness will disappear
  2. BReplace or service the joint as specified, then verify driveline operation
  3. CIncrease tire pressure to reduce driveline movement
  4. DAdjust the rear wheel alignment to remove joint play
Show answerCorrect answer: B

A loose universal joint can cause clunks and driveline vibration and may fail if ignored. The joint should be serviced or replaced according to its design and the manufacturer’s procedure.

How to use this practice test

Access is free. A practice session presents up to 20 random questions from the 50-question bank and shows results afterward. Use the questions to check how you interpret chassis symptoms and choose service procedures; review any missed answers by identifying the measurement, component behavior, or safety step involved.

Preparation tips

  • For brake questions, connect pedal feel and booster tests to the condition of the hydraulic or assist system before selecting a repair step.
  • Practice explaining why rotor thickness is checked at several points around the friction surface and how uneven measurements affect service decisions.
  • Distinguish steering-wheel misalignment from vehicle drift; relate each symptom to the inspection or alignment check it calls for.
  • Review how universal-joint looseness can produce a clunk as driveline load changes, and identify the appropriate inspection or replacement response.
  • Recall safe lift setup and specified crisscross lug-nut tightening procedures, including why even clamping matters.
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