T4 ASE Brakes Medium/Heavy Duty Brakes Questions With Complete Solutions
Psi loss rate for Straight Truck correct answer: 2 psi/minute Psi loss rate for combination vehicle correct answer: less than 3 psi/minute Service Brake Pressure Drop Test correct answer: 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 correct answer: Cause 1) brake imbalance 2) increased stopping distance 3) excessive heat and wear Instability and premature wear correct answer: a 4 psi difference in the air delivery between axles is enough to cause instability and premature wear. Troubleshooting poor brake performance due to air correct answer: 1) inspect air compressor 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 correct answer: 1) regulates air going to
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