T4 ASE Brakes Study Guide _ T4
Medium
ASE Brakes
& Heavy-Duty
Study Guide
Brake_Systems
T4
Medium
ASE Brakes
Certification
& Heavy-Duty
StudyReview.pdf
Guide
Brake_Systems
Medium Certification
& Heavy-Duty Review.pdf
Brake Systems Certification Review.pdf
T4 ASE Brakes Study Guide | Medium &
Heavy-Duty Brake Systems Certification
Review
Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_
T4 ASE Brakes Study Guide _ T4
Medium
ASE Brakes
& Heavy-Duty
Study Guide
Brake_Systems
T4
Medium
ASE Brakes
Certification
& Heavy-Duty
StudyReview.pdf
Guide
Brake_Systems
Medium Certification
& Heavy-Duty Review.pdf
Brake Systems Certification Review.pdf
,T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
Psi loss rate for Straight Truck 2 psi/minute
Psi loss rate for combination vehicle less than 3 psi/minute
Service Brake Pressure Drop Test Apply service brake to 90 psi. Loss rate should be less than 3
psi/minute for straight vehicles and less than 4 psi/minute for
combination vehicles.
Improperly adjusted brake shoes Cause
1) brake imbalance
2) increased stopping distance
3) excessive heat and wear
Instability and premature wear a 4 psi difference in the air delivery between axles is enough
to cause instability and premature wear.
T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
, T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
Troubleshooting poor brake performance 1) inspect air compressor
due to air 2) verify pressure build up
3) look for clogged air compressor filter
4) possible slipping belt
5) possible air leaks
6) possible defective governor
Pressure Governors 1) regulates air going to system
2) adjustable pressure
3) defective governor or out of adjustment can cause
compressor to function improperly.
4) designed to regulate the compressors output.
5) may be attached to compressor or externally mounted.
T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
Medium
ASE Brakes
& Heavy-Duty
Study Guide
Brake_Systems
T4
Medium
ASE Brakes
Certification
& Heavy-Duty
StudyReview.pdf
Guide
Brake_Systems
Medium Certification
& Heavy-Duty Review.pdf
Brake Systems Certification Review.pdf
T4 ASE Brakes Study Guide | Medium &
Heavy-Duty Brake Systems Certification
Review
Guidehttps://www.stuvia.com/dashboard!@_)#*)(@$)($@*($@)($@*_
T4 ASE Brakes Study Guide _ T4
Medium
ASE Brakes
& Heavy-Duty
Study Guide
Brake_Systems
T4
Medium
ASE Brakes
Certification
& Heavy-Duty
StudyReview.pdf
Guide
Brake_Systems
Medium Certification
& Heavy-Duty Review.pdf
Brake Systems Certification Review.pdf
,T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
Psi loss rate for Straight Truck 2 psi/minute
Psi loss rate for combination vehicle less than 3 psi/minute
Service Brake Pressure Drop Test Apply service brake to 90 psi. Loss rate should be less than 3
psi/minute for straight vehicles and less than 4 psi/minute for
combination vehicles.
Improperly adjusted brake shoes Cause
1) brake imbalance
2) increased stopping distance
3) excessive heat and wear
Instability and premature wear a 4 psi difference in the air delivery between axles is enough
to cause instability and premature wear.
T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
, T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
Troubleshooting poor brake performance 1) inspect air compressor
due to air 2) verify pressure build up
3) look for clogged air compressor filter
4) possible slipping belt
5) possible air leaks
6) possible defective governor
Pressure Governors 1) regulates air going to system
2) adjustable pressure
3) defective governor or out of adjustment can cause
compressor to function improperly.
4) designed to regulate the compressors output.
5) may be attached to compressor or externally mounted.
T4 ASE Brakes.pdf T4 ASE Brakes.pdf T4 ASE Brakes.pdf
