HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE QUESTIONS AND ANSWERS 2025/2026

HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY GUIDE QUESTIONS AND ANSWERS 2025/2026 AN ENGINE BRAKE (JACOBS BRAKE) - Answer -A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: - Answer -A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MODULATOR VALVE. (NOT CORRECT AWNSER) D. A RELAY VALVE. A MECHANIC HAS REMOVED A BRAKE DRUM AND FOUND THE BRAKE LININGS SOAKED WITH GREASE. THE BRAKE LININGS SHOULD BE: - Answer -A. REPLACED. (CORRECT AWNSER)B. SANDED TO ROUGHEN UP THE FRICTION SURFACE. C. DIPPED IN LACQUER THINNER. D. WASHED WITH DENATURED ALCOHOL. IN THE DRAWING BELOW, THE PARKING BRAKES ARE APPLIED BY: - Answer -A. AIR PRESSURE AT POINT F. B. VACUUM IN AREA B. C. SPRING AT POINT C. D. PRESSURE IN AREA A. (NOT CORRECT