HEAVY TRUCK BRAKES MICHIGAN QUESTIONS
AND ANSWERS RATED A+
✔✔the residual valve in the master cylinder: - ✔✔a. limits pressure build up in the
system.
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 pressure would likely be caused by: - ✔✔a. a govenor that is
bad or out of adjustment. (possible correct awnser)
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 has a severe leak, what will happen during operation? -
✔✔a. valve at a will protect the pressure in the dry tank.
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.
✔✔during a hard stop, one brake has locked on a trailer with "s" cam brakes. the
service and emergency lines are hooked up properly and the system is at normal
pressure but the brakes will not release. what is the likely cause of this problem? - ✔✔a.
the service brake chamber diaphragm has split. (possible correct awnser)
b. the cam has rolled over due to too much lining wear.
c. the anti-lock module has burned out at the sending unit. (not correct awnser)
d. the chamber spring has rusted and is broken.
✔✔too much effort is required on the brake pedal to stop a truck with a vacuum booster.
what is the likely cause of this problem? - ✔✔a. seized automatic adjusters.
b. glazed linings
c. a defective modulator valve. (not correct awnser)
AND ANSWERS RATED A+
✔✔the residual valve in the master cylinder: - ✔✔a. limits pressure build up in the
system.
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 pressure would likely be caused by: - ✔✔a. a govenor that is
bad or out of adjustment. (possible correct awnser)
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 has a severe leak, what will happen during operation? -
✔✔a. valve at a will protect the pressure in the dry tank.
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.
✔✔during a hard stop, one brake has locked on a trailer with "s" cam brakes. the
service and emergency lines are hooked up properly and the system is at normal
pressure but the brakes will not release. what is the likely cause of this problem? - ✔✔a.
the service brake chamber diaphragm has split. (possible correct awnser)
b. the cam has rolled over due to too much lining wear.
c. the anti-lock module has burned out at the sending unit. (not correct awnser)
d. the chamber spring has rusted and is broken.
✔✔too much effort is required on the brake pedal to stop a truck with a vacuum booster.
what is the likely cause of this problem? - ✔✔a. seized automatic adjusters.
b. glazed linings
c. a defective modulator valve. (not correct awnser)
