[Richard]

A couple of things to look for. I think Newell also put the stop brake or spring brake on the tags by Coach 639. That brake requires air pressure to release it. When you press the Stop brake yellow button, you actually start air to the spring loaded brake chamber. If you compromised the air to the spring brake chamber because the hose cracked or pulled loose while the tag was hanging down, then it would explain what is happening.

So how to check? Chock the wheels. With engine off to kill the noise. Push the Stop brake button in. If you have a leak you should hear it.

If no leak, then jack up the tag wheel. What happens when you try to turn the wheel by hand? If it doesn’t spin by hand, then you will have to take the wheel off to get a better look at what is going on with the disc and the caliper.

On most spring brakes, there is a special wrench that rides in a clip on the brake that is inserted into the center hole of the spring brake chamber to cage it. When you cage the brake you are manually compressing the spring that actuates the STOP brake. You are doing the same thing that happens with air pressure when you release the STOP brake. What ever you do, DO NOT take the band off the spring brake chamber to see what is going on. There is enough stored energy in the spring to really hurt you.