Troubleshooting Even Brake Supplemental Braking System that Releases all Air Pressure

Question:

when I plug unit in and push test button all air is released and it does not pump up again

asked by: Robert E

Expert Reply:

I sent this to my tech contact at Roadmaster and they responded with the following:

Without any other information, it sounds to me like the quick-exhaust valve (QEV) has failed. This is located near the base (but on the side) of the air cylinder that hooks to and actuates the brake pedal. Customer can pull cover off or tip unit over on side and when he hits the test button, he can feel to see if that is indeed where the issue is. This is your part number # RM-450601-50.

Depending on the age of the unit, it may have a different looking QEV -- this is not a problem we just use a more reliable product.

I am attaching an image which shows the proper installation of the new style QEV since it looks different

expert reply by: Jameson C