How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 5425
Experience:  Owner at DJ Wilson
Type Your Medium and Heavy Trucks Question Here...
Daniel Wilson is online now
A new question is answered every 9 seconds

Driveline park brake not releasing. on international t444e

Customer Question

driveline park brake not releasing. on international t444e 3400, has air but not sending air to release parking brakes.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 1 year ago.

Hi my name is ***** ***** will be glad to try to help. The brake is spring applied and pressure released. What do you mean it has air but doesnt have air to release? If there is air to the brake chamber to release but the brake is not releasing it means there must be a leak in the chamber itself. Are you hearing an air leak?

Customer: replied 1 year ago.
no air leak. not getting air to chamber. got air going into release button but nothing coming out when released. i work on deisels on daily basis, for swift trans. but our brake system is all air. trying to figure out if it's the release valve for brakes or the chamber for park brakes? truck builds to 120 psi, has 120 psi to brake release but nothing coming out when pushed in to release.
Expert:  Daniel Wilson replied 1 year ago.

thanks for the update. If there is air into the park brake switch but not coming out of the delivery side of the switch, there is a problem in the switch. check the release valve for sticking as well. Remove the top cover and inspect for sludge and corrosion causing the valve to stick. Let me know