HEAVY TRUCK BRAKES MICHIGAN MECHANIC
STUDY GUIDE – Questions With Perfect Solutions
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Terms in this set (50)
AN ENGINE BRAKE (JACOBS BRAKE) 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 A. AN INVERSION VALVE. (POSSIBLE CORRECT
PART AT C IS: AWNSER)
B. A SAFETY VALVE.
C. A MODULATOR VALVE. (NOT CORRECT AWNSER)
D. A RELAY VALVE.
A MECHANIC HAS REMOVED A A. REPLACED. (CORRECT AWNSER)
BRAKE DRUM AND FOUND THE B. SANDED TO ROUGHEN UP THE FRICTION
BRAKE LININGS SOAKED WITH SURFACE.
GREASE. THE BRAKE LININGS C. DIPPED IN LACQUER THINNER.
SHOULD BE: D. WASHED WITH DENATURED ALCOHOL.
IN THE DRAWING BELOW, THE A. AIR PRESSURE AT POINT F.
PARKING BRAKES ARE APPLIED BY: B. VACUUM IN AREA B.
C. SPRING AT POINT C.
D. PRESSURE IN AREA A. (NOT CORRECT AWNSER)
, WHAT IS THE PURPOSE OF A A. TO DECREASE BRAKE PEDAL EFFORT. (POSSIBLE
VACUUM BOOSTER? CORRECT AWNSER)
B. TO PREVENT FADE UNDER HEAVY BRAKING.
C. TO PROVIDE ASSISTANCE WHEN THE ENGINE
VACUUM IS LOW. (NOT CORRECT AWNSER)
D. TO MAINTAIN UNIFORM PEDAL TRAVEL AS THE
LININGS WEAR.
THE TRAILER BRAKES DO NOT A. ICE IN THE LINES AT THE TRAILER.
WORK. THE TRACTOR SYSTEM IS AT B. A BAD RELAY VALVE.
NORMAL PRESSURE. THERE ARE NO C. A BAD SAFETY RELIEF VALVE.
LEAKS AND THE SERVICE AND D. BOTH A AND B. (CORRECT AWNSER)
EMERGENCY LINES ARE HOOKED UP
RIGHT. WHAT COULD CAUSE THIS
PROBLEM?
THE RESIDUAL VALVE IN THE A. LIMITS PRESSURE BUILD UP IN THE SYSTEM.
MASTER CYLINDER: B. STOPS THE FLOW TO DAMAGED BRAKE LINES.
C. KEEPS SOME PRESSURE IN THE SYTEM WHEN
THE BRAKES ARE RELEASED. (CORRECT AWNSER)
D. IS OPERATED BY ENGINE VACUUM.
HIGHER THAN NORMAL AIR A. A GOVENOR THAT IS BAD OR OUT OF
PRESSURE WOULD LIKELY BE ADJUSTMENT. (POSSIBLE CORRECT AWNSER)
CAUSED BY: B. A PLUGGED SAFETY VALVE. (NOT CORRECT
AWNSER)
C. A ONE-WAY CHECK VALVE STUCK OPEN.
D. A STICKY QUICK RELEASE VALVE.
IF GLADHAND 2 IS UNHOOKED OR A. VALVE AT A WILL PROTECT THE PRESSURE IN THE
HAS A SEVERE LEAK, WHAT WILL DRY TANK.
HAPPEN DURING OPERATION? B. TRACTOR BRAKES WILL APPLY AUTOMATICALLY.
(NOT CORRECT AWNSER)
C. VALVE AT C WILL APPLY TRAILER BRAKES.
D. VALVE AT B WILL APPLY TRAILER BRAKES.
STUDY GUIDE – Questions With Perfect Solutions
Save
Terms in this set (50)
AN ENGINE BRAKE (JACOBS BRAKE) 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 A. AN INVERSION VALVE. (POSSIBLE CORRECT
PART AT C IS: AWNSER)
B. A SAFETY VALVE.
C. A MODULATOR VALVE. (NOT CORRECT AWNSER)
D. A RELAY VALVE.
A MECHANIC HAS REMOVED A A. REPLACED. (CORRECT AWNSER)
BRAKE DRUM AND FOUND THE B. SANDED TO ROUGHEN UP THE FRICTION
BRAKE LININGS SOAKED WITH SURFACE.
GREASE. THE BRAKE LININGS C. DIPPED IN LACQUER THINNER.
SHOULD BE: D. WASHED WITH DENATURED ALCOHOL.
IN THE DRAWING BELOW, THE A. AIR PRESSURE AT POINT F.
PARKING BRAKES ARE APPLIED BY: B. VACUUM IN AREA B.
C. SPRING AT POINT C.
D. PRESSURE IN AREA A. (NOT CORRECT AWNSER)
, WHAT IS THE PURPOSE OF A A. TO DECREASE BRAKE PEDAL EFFORT. (POSSIBLE
VACUUM BOOSTER? CORRECT AWNSER)
B. TO PREVENT FADE UNDER HEAVY BRAKING.
C. TO PROVIDE ASSISTANCE WHEN THE ENGINE
VACUUM IS LOW. (NOT CORRECT AWNSER)
D. TO MAINTAIN UNIFORM PEDAL TRAVEL AS THE
LININGS WEAR.
THE TRAILER BRAKES DO NOT A. ICE IN THE LINES AT THE TRAILER.
WORK. THE TRACTOR SYSTEM IS AT B. A BAD RELAY VALVE.
NORMAL PRESSURE. THERE ARE NO C. A BAD SAFETY RELIEF VALVE.
LEAKS AND THE SERVICE AND D. BOTH A AND B. (CORRECT AWNSER)
EMERGENCY LINES ARE HOOKED UP
RIGHT. WHAT COULD CAUSE THIS
PROBLEM?
THE RESIDUAL VALVE IN THE A. LIMITS PRESSURE BUILD UP IN THE SYSTEM.
MASTER CYLINDER: B. STOPS THE FLOW TO DAMAGED BRAKE LINES.
C. KEEPS SOME PRESSURE IN THE SYTEM WHEN
THE BRAKES ARE RELEASED. (CORRECT AWNSER)
D. IS OPERATED BY ENGINE VACUUM.
HIGHER THAN NORMAL AIR A. A GOVENOR THAT IS BAD OR OUT OF
PRESSURE WOULD LIKELY BE ADJUSTMENT. (POSSIBLE CORRECT AWNSER)
CAUSED BY: B. A PLUGGED SAFETY VALVE. (NOT CORRECT
AWNSER)
C. A ONE-WAY CHECK VALVE STUCK OPEN.
D. A STICKY QUICK RELEASE VALVE.
IF GLADHAND 2 IS UNHOOKED OR A. VALVE AT A WILL PROTECT THE PRESSURE IN THE
HAS A SEVERE LEAK, WHAT WILL DRY TANK.
HAPPEN DURING OPERATION? B. TRACTOR BRAKES WILL APPLY AUTOMATICALLY.
(NOT CORRECT AWNSER)
C. VALVE AT C WILL APPLY TRAILER BRAKES.
D. VALVE AT B WILL APPLY TRAILER BRAKES.
