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ASE Entry-Level Truck

ASE Entry-Level Brakes — practice test

The Entry-Level Brakes test is one of five ASE tests for students in ASE-accredited medium and heavy truck programs. It covers air brakes, hydraulic brakes, ABS and stability systems, and wheel bearings. Questions are often missed when a student knows the parts but mixes up what a part does or what to do next. Some statements are only half true, so read each one on its own before you pick an answer.

Studying for ASE Entry-Level Brakes? Overhaul Prep has 131 verified ETB questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

131ETB questions
100%with explanations
19,209questions in total
Try 10 free ASE Entry-Level Truck questions →

What's on the ASE Entry-Level Brakes test

The test has 40 scored questions, and you need 20 correct to pass. ASE may add extra unscored questions for statistical checks. Air Brakes is the biggest area at 22 questions. Hydraulic Brakes has 9 questions. Vehicle Dynamic Brake Systems (ABS, automatic traction control, and electronic stability control) has 6. Wheel Bearings has 3. The questions follow ASE's task list for the test, which comes from the 2022 Instructional Standard for ASE program accreditation.

ASE Entry-Level task list: Brakes

ASE builds the Entry-Level test on the Test Specifications and Task List in its ASE Test Specifications and Task Lists, M/H Truck Series (2024). In ASE's words: “Every question on the test represents one or more of these tasks, although some tasks may not appear on the version of the test that you see.” This is that list: its 4 content areas, how many questions each one gets, and the 55 tasks the questions are drawn from.

The real test, in ASE's Entry-Level specifications: 40 questions, 20 correct to pass. It may include extra unscored questions.

Test specifications

Content areaQuestions in test
A Air Brakes22
B Hydraulic Brakes9
C Vehicle Dynamic Brake Systems (Air and Hydraulic): Antilock Brake System (ABS), Automatic Traction Control (ATC) System, and Electronic Stability Control (ESC) System6
D Wheel Bearings3
Total40

The task list, area by area

AAir Brakes22 questions · 24 tasks

1.General

  • 1.Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
  • 2.Identify brake system components and configurations (including parking brake, power assist, and vehicle dynamic brake systems).
  • 3.Identify brake performance problems caused by the mechanical/foundation brake system (air).
  • 4.Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.

2.Air Supply and Service Systems

  • 1.Inspect, test, repair, and/or replace air supply system components such as compressor, governor, air drier, tanks, and lines; inspect service system components such as lines, fittings, mountings, and valves (hand brake/trailer control, brake relay, quick release, tractor protection, emergency/spring brake control/modulator, pressure relief/safety); determine needed action.
  • 2.Test gauge operation and readings; test low pressure warning alarm operation; perform air supply system tests such as pressure build-up, governor settings, and leakage; drain air tanks and check for contamination; determine needed action.
  • 3.Demonstrate knowledge and understanding of air supply and service system components and operations.
  • 4.Inspect air compressor drive gear components (gears, belts, tensioners, and/or couplings); determine needed action.
  • 5.Inspect air compressor inlet; inspect oil supply and coolant lines, fittings, and mounting brackets; repair or replace as needed.
  • 6.Inspect and test air tank relief (safety) valves, one-way (single) check valves, two-way (double) check valves, manual and automatic drain valves; determine needed action.
  • 7.Inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors; determine needed action.
  • 8.Inspect and test brake application (foot/treadle) valve, fittings, and mounts; check pedal operation; determine needed action.

3.Mechanical/Foundation Brake System

  • 1.Inspect, test, repair, and/or replace service brake chambers, diaphragms, clamps, springs, pushrods, clevises, and mounting brackets; determine needed action.
  • 2.Identify slack adjuster type; inspect slack adjusters; perform needed action.
  • 3.Check camshafts (S-cam), tubes, rollers, bushings, seals, spacers, retainers, brake spiders, shields, anchor pins, and springs; perform needed action.
  • 4.Inspect rotor and mounting surface; measure rotor thickness, thickness variation, and lateral runout; determine needed action.
  • 5.Inspect, clean, and adjust air disc brake caliper assemblies; inspect and measure disc brake pads; inspect mounting hardware; perform needed action.
  • 6.Remove brake drum; clean and inspect brake drum and mounting surface; measure brake drum diameter; measure brake lining thickness; inspect brake lining condition; determine needed action.
  • 7.Diagnose concerns related to the mechanical/foundation brake system including poor stopping, brake noise, premature wear, pulling, grabbing, or dragging; determine needed action.

4.Parking Brake System

  • 1.Inspect, test, and/or replace parking (spring) brake chamber.
  • 2.Inspect, test, and/or replace parking (spring) brake check valves, lines, hoses, and fittings.
  • 3.Inspect, test, and/or replace parking (spring) brake application and release valve.
  • 4.Manually release (cage) and reset (uncage) parking (spring) brakes.
  • 5.Identify and test anti-compounding brake function; determine needed action.
BHydraulic Brakes9 questions · 21 tasks

1.General

  • 1.Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins.
  • 2.Identify brake system components and configurations (including parking brake, power assist, and vehicle dynamic brake systems).
  • 3.Identify brake performance problems caused by the mechanical/foundation brake system (hydraulic).
  • 4.Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.

2.Hydraulic System

  • 1.Check master cylinder fluid level and condition; determine proper fluid type for application.
  • 2.Inspect hydraulic brake system for leaks and damage; test, repair, and/or replace hydraulic brake system components.
  • 3.Check hydraulic brake system operation including pedal travel, pedal effort, and pedal feel; determine needed action.
  • 4.Diagnose poor stopping, premature wear, pulling, dragging, imbalance, or poor pedal feel caused by problems in the hydraulic system; determine needed action.
  • 5.Test master cylinder for internal/external leaks and damage; replace as needed.
  • 6.Test metering (hold-off), load sensing/proportioning, proportioning, and combination valves; determine needed action.
  • 7.Test brake pressure differential valve; test warning light circuit switch, bulbs/LEDs, wiring, and connectors; determine needed action.
  • 8.Bleed and/or flush hydraulic brake system.

3.Mechanical/Foundation Brake System

  • 1.Clean and inspect rotor and mounting surface; measure rotor thickness, thickness variation, and lateral runout; determine necessary action.
  • 2.Inspect and clean disc brake caliper assemblies; inspect and measure disc brake pads; inspect mounting hardware; perform needed action.
  • 3.Remove, clean and inspect brake drums; measure brake drum diameter; measure brake lining thickness; inspect brake lining condition; inspect wheel cylinders; determine serviceability.
  • 4.Check disc brake caliper assembly mountings and slides; replace as needed.
  • 5.Check parking brake operation; inspect parking brake application and holding devices; adjust, repair, and/or replace as needed.

4.Power Assist Systems

  • 1.Check brake assist/booster system (vacuum or hydraulic) hoses and control valves; check fluid level and condition (if applicable).
  • 2.Check operation of emergency (back-up/reserve) brake assist system.
  • 3.Identify concerns related to the power assist system (vacuum or hydraulic), including stopping problems caused by the brake assist (booster) system; determine needed action.
  • 4.Inspect, test, repair, and/or replace hydraulic brake assist/booster systems, hoses, and control valves.
CVehicle Dynamic Brake Systems (Air and Hydraulic): Antilock Brake System (ABS), Automatic Traction Control (ATC) System, and Electronic Stability Control (ESC) System6 questions · 8 tasks
  • 1.Observe antilock brake system (ABS) warning light operation including trailer and dash mounted trailer ABS warning light; determine needed action.
  • 2.Observe automatic traction control (ATC) and electronic stability control (ETC) warning light operation; determine needed action.
  • 3.Identify stopping concerns related to the vehicle dynamic brake systems: ABS, ATC, and ESC; determine needed action.
  • 4.Diagnose problems in the vehicle dynamic brake control systems; determine needed action.
  • 5.Check and test operation of vehicle dynamic brake system (air and hydraulic) mechanical and electrical components; determine needed action.
  • 6.Test vehicle/wheel speed sensors and circuits; adjust, repair, and/or replace as needed.
  • 7.Bleed ABS hydraulic circuits.
  • 8.Verify power line carrier (PLC) operation.
DWheel Bearings3 questions · 2 tasks
  • 1.Clean, inspect, lubricate, and/or replace wheel bearings and races/cups; replace seals and wear rings; inspect spindle/tube; inspect and replace retaining hardware; adjust wheel bearings; check hub assembly fluid level and condition; verify end play with dial indicator method.
  • 2.Identify, inspect, and/or replace unitized/preset hub bearing assemblies.

From the ASE Test Specifications and Task Lists, M/H Truck Series (2024), read October 20, 2026, in ASE's words. ASE's study guides page has the current PDF. Task lists for 43 ASE tests →

High-yield ASE Entry-Level Brakes topics

The material that shows up year after year. If you're short on time, start here.

  • Air supply parts and what each one does. The governor senses tank pressure and signals the compressor to stop at cut-out. The safety (relief) valve vents air if pressure climbs too high, and the air dryer removes moisture and oil before the tanks.
  • Oil in the air tanks. Oil found when you drain the tanks usually comes from the compressor. Check the compressor and the dryer.
  • Foundation brake parts. The brake chamber turns air pressure into push on the pushrod. The slack adjuster turns that into rotation of the S-cam, and the S-cam spreads the shoes against the drum. Out-of-adjustment brakes use up pushrod travel and stop weakly, and an automatic slack adjuster that keeps going out of range needs its cause found.
  • Drums, lining, and air disc brakes. A drum measured past the discard diameter cast on it gets replaced, and so does a cracked drum. Grease-soaked lining cannot be cleaned, so replace it and fix the leak. On air disc brakes, a dial indicator measures rotor lateral runout, a micrometer measures thickness, and pads are replaced in axle sets.
  • Spring brakes and parking. The spring applies the brake when air is exhausted, and a damaged spring brake chamber is replaced as a complete assembly. Chock the wheels before you cage one, and a caged brake must be uncaged and reset. Anti-compounding stops spring force and service force from adding together.
  • ABS and its lamps. At key-on the ABS lamp lights briefly, then goes out. A lamp that stays on means a fault, and the service brakes still work without antilock. Read and record the codes first, test the sensor, connector, wiring, and tone ring, and clear codes only after the repair. Measure resistance only on a de-energized circuit.

Where techs lose points on ASE Entry-Level Brakes

Good technicians miss these — not from lack of skill, but because the question is built to catch them.

  • Wrong belief: you can adjust a bad pushrod stroke back into range and move on. Right answer: on automatic slack adjusters, stroke that stays out of range points to a faulty adjuster or a worn or binding foundation brake part. Find the cause.
  • Wrong belief: a spring brake can be opened up and repaired, or a caged brake is fine to drive. Right answer: the chamber is replaced as an assembly because of the stored spring force. Caging is only a temporary way to release the brake, and it removes the parking and emergency function.
  • Wrong belief: a steady ABS lamp means no brakes, or a trailer ABS lamp can be ignored. Right answer: the service brakes still work, but antilock is off at the affected wheel or axle, so wheels can lock. The trailer ABS lamp reports a fault in the trailer's own ABS and still needs diagnosis.
  • Wrong belief: a sensor code means replace the ABS controller or modulator. Right answer: test the sensor, connector, wiring, and tone ring first. The code points to the circuit, not to the expensive part.

A study plan that works for ASE Entry-Level Brakes

Roughly two weeks of real preparation, in the order that actually builds on itself.

  1. Day 1: Air supply and service system, the biggest part of the test. Learn the compressor, governor, dryer, tank valves, and check valves, plus the pressure build-up and leakage tests.
  2. Day 2: Air foundation and parking brakes. Cover the chamber, slack adjuster, S-cam, drum and lining checks, air disc brakes, spring brakes, caging, and anti-compounding.
  3. Day 3: Hydraulic brakes. Cover master cylinder, fluid type, pedal feel, metering and differential valves, bleeding, rotors, calipers, and power assist.
  4. Day 4: ABS, traction control, and stability control warning lamps, wheel speed sensors, and PLC, then wheel bearing end play and preset hubs. Finish with a set of mixed questions.

Sample ASE Entry-Level Brakes questions

Straight from the bank — answers highlighted, with the explanation underneath.

A technician is diagnosing a repeat brake complaint and wants to know whether the manufacturer has published a known fix. Which resource is the BEST place to look?

  1. The fuel tax records for the truck
  2. The driver's tire pressure log
  3. The cab's paint and trim code label
  4. Technical service bulletins for that model
WhyTechnical service bulletins list known problems and updated repair procedures the manufacturer released after the truck was built. Checking them first can save time on a repeat complaint.

Where should a technician look FIRST to find the correct brake fluid type for a hydraulic brake system?

  1. Whatever brake fluid is already on the shop shelf
  2. The service information and the reservoir cap marking
  3. A general parts store catalog for similar vehicles
  4. The fluid type used by the last shop that serviced it
WhyThe manufacturer's service information specifies the fluid, and the reservoir cap is usually marked with the required DOT type. Guessing or using what was last used risks putting an incompatible fluid in the system.

When the ignition is first turned on, a normal ABS warning lamp on the dash will:

  1. flash continuously until the truck moves
  2. remain off and never turn on
  3. turn on briefly for a bulb check, then go out
  4. stay on until the brakes are applied
WhyThe ABS controller lights the lamp for a short bulb check at key-on and then turns it off if no faults are found. A lamp that never lights could mean a burned-out bulb or an open circuit. A lamp that stays on means a fault is stored.

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