All 45 exams / H-series / ASE H4 Brakes
H4
ASE H4 Brakes
Transit buses
What's on the H4 exam?
1
Air Supply and Service Systems Diagnosis and Repair
2
Mechanical/Foundation Brakes Diagnosis and Repair
3
Parking Brakes Diagnosis and Repair
4
Wheel Bearings Diagnosis and Repair
Content-area outline only, authored from ASE's public task-list structure. No test question, answer, or diagnostic scenario is reproduced from ASE or any prep publisher.
H4 quick reference H-series
Categoryrepair technician
Work experience2
Question count60
Time allowed75 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (approximately half-length recert version) every 5 years, or the ASE Renewal App.
Source: https://ase.com/wp-content/uploads/ASE_TransitBus_Study_Guide.pdf.
Checked 2026-07-30.
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