ASE Transit Bus Brakes (H4) Examination — Information & Free Practice
US · Examination information
200 free questions · Answer explanations · No signup required
ASE Transit Bus Brakes (H4) Examination
- Provider
- Prometric test centers
- Format
- Computer-based multiple-choice knowledge examination; one correct answer per question.
- Exam questions
- Total questions: 60; Scored questions: 50; Unscored questions: 10; The total includes the scored and unscored questions.
- Time limit
- 75 minutes
Examination outline
Air Supply and Service Systems Diagnosis and Repair (48%)
- Supply and service system malfunction diagnosis
- Air system build-up and recovery
- Air reservoir tanks and mounting
- Air compressor drive gears and couplings
- Air compressor, intake, and fluid lines
- Pressure controls, unloaders, protection valves, and filters
- Air lines, hoses, fittings, and couplings
- Air tank relief, check, and drain valves
- Air drier systems
- Brake application valve and pedal free play
- Double check and anti-compounding valves
- Stop and parking brake light circuits
- Brake relay and quick-release valves
- Interlock system components
- Inversion and emergency spring brake control valves
- Low-pressure warning devices
- Air pressure sensors, gauges, lines, and fittings
- ABS/ATC warning lamps and diagnostic trouble codes
- ABS poor stopping and lockup diagnosis
- ABS wheel speed sensors and tone rings
- ABS/ATC controllers, modulator and traction valves, wiring
- Auxiliary braking systems
Mechanical/Foundation Brakes Diagnosis and Repair (28%)
- Foundation brake, slack adjuster, and chamber diagnosis
- Service and parking brake deceleration tests
- Service brake chambers and mounting
- Automatic slack adjusters
- S-cams, rollers, shafts, bushings, seals, and retainers
- Brake spiders, shields, anchor pins, and hardware
- Air disc brake calipers
- Brake shoes, linings, and pads
- Brake drums and rotors
- Resurfacing rotors, drums, and linings
Parking Brakes Diagnosis and Repair (14%)
- Parking spring brake chambers and lawful disposal
- Parking brake valves, lines, hoses, and fittings
- Manual spring brake release and caging
- Parking brake override valve
- Towing circuit components
Wheel Bearings Diagnosis and Repair (10%)
- Axle hubs and wheel assemblies
- Wheel bearings, seals, and wear rings
- Wheel bearing adjustment to manufacturer procedures
- Extended-service bearing assemblies and installation
- Planetary axle seals, O-rings, and endplay
Examination sources
- ASE Transit Bus Study Guide
p.3, Introduction, controlling scope statements
- ASE Transit Bus Study Guide
p.3, Introduction, Task List applicability
- ASE Transit Bus Study Guide
p.21, heading
- ASE Transit Bus Study Guide
p.21, Test H4 Test Specifications table, complete Content Area / Questions in Test / Percentage of Test columns
- ASE Transit Bus Study Guide
pp.21–22, A task list, continuation tasks 21–22
- ASE Transit Bus Study Guide
p.22, B task-list heading
- ASE Transit Bus Study Guide
p.22, C task-list heading and task 1
- ASE Transit Bus Study Guide
p.22, D task-list task 5 and end mark
- Transit Bus Certification Tests
Study Guides, description and current Transit Bus Study Guide link
- ASE Transit Bus Study Guide
p.24, H4 sample continuation heading
- ASE Transit Bus Study Guide
p.4, Certification Tests table, H4 row under Number of questions and Testing time
- ASE Transit Bus Study Guide
p.4, asterisk footnote below test table
- ASE Certification: Need to Know
p.3, How Do I Become Certified?, step 3
- ASE Certification: Need to Know
p.3, How Do I Become Certified?, steps 1–2
- ASE Certification: Need to Know
p.4, What Are My Certification Options?, initial certification paragraph
- Testing Policies and Procedures – Test Centers
90 Days to Take Your Test
- Transit Bus Certification Tests
Registration Dates, Fall Registration
- Transit Bus Certification Tests
Certification Quick Links & Resources, Register Now
- FAQs - ASE Certifications and Testing
ASE Test Requirements, advanced-level prerequisites
- Instructions for Completing the ASE Work Experience Form
ASE Work Experience Requirements, taking tests before experience
- FAQs - ASE Certifications and Testing
Testing Languages, English as a second language
- Testing Policies and Procedures – Test Centers
30-Day Wait Period
- FAQs - ASE Certifications and Testing
Special Accommodations, ADA approval before registration
Related license preparation
This examination may be required or accepted as an alternative, depending on the license and application pathway.