| Author | Message | ||
| mark (Coolbus)
Registered Member Username: Coolbus Post Number: 37 Registered: 7-2006 Posted From: 71.54.203.149 Rating: N/A |
I need to move the bus, but the darn thing has been sitting for a while... What can I do to release them (airbrakes)? Seems I have read here to apply brakes, then push the release? Please help (the quiucker the better!) thanks Mark | ||
| Don Evans (Doninwa)
Registered Member Username: Doninwa Post Number: 26 Registered: 1-2007 Posted From: 65.61.96.82 Rating: N/A |
There are two common types. First build full pressure in the air system. Push the release in and it should stay. If you have spring brakes that should release them. If you have DD3 brakes make a full application of brakes. If you have a application gauge you want to see 100psi. So, not knowing which type you have, push the release and then push hard on the brake pedal and hold for several seconds. That should release either type. It is also possible that your brake shoes are stuck to the drums. I have one rig that does that. Usually a bit of "gentle" rocking back and forth from forward to reverse will break them loose. Depends on weather you are in rainy OR or dry OR and how long it's been sitting how likely the shoes are stuck to the drums. If still stuck you will have to look at the brakes to see whats happening. Good luck | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1005 Registered: 12-2000 Posted From: 74.12.93.47 Rating: N/A |
As posted over at MAK: And it doesn't matter which brake type for this. All the while, being completely ready for the bus to launch.... Run engine. when air is full, release parking brake make a couple of long, full foot brake applications in an effort to upset the bond between lining and drum keep eye on air pressure, more air means a stronger squeeze, let/make the air build back up engage reverse and give it a good pull engage forward and do the same. Good pull means a few seconds of full throttle in an auto, and well, in a manual, a small amount of clutch abuse is in order. Reapply parking brake repeat a few times. I'll mess around agitating the stuck brake shoes using the engine and brake mechanisms for awhile, because I don't want to go underneath and pound on the shoes. If you have to go under, all the usual precautions about the bus falling on you, Ensure you have proper movement of the brake linkage between parked and released. ok, now we have to use some localized violence. Be careful not to shatter the edges of the linings, a chisel/prop/drift/old screwdriver and your big hammer lets you apply the force more precisely to the edge of the shoe and more easily than trying to whack with just the hammer. It should come unstuck without going underneath, as long as you haven't parked in the swamp for years... happy coaching! buswarrior | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 536 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
See, we finally found a useful reason to have the rear axle seals leak grease all over the brake lining.....No more frozen brake shoes!  | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 29 Registered: 3-2007 Posted From: 67.76.15.35 Rating: N/A |
chessie; how come we be smart and not rich? My coach has that dd3 and they will stick after sitting for a while too and that is they way to make sure they don't stick haha | ||
| Mark Renner (Boomer)
Registered Member Username: Boomer Post Number: 61 Registered: 11-2006 Posted From: 12.180.53.193 Rating: N/A |
You better be careful applying torque through the drive train to break loose froze up brakes. Else a broken driveshaft or differential might result. With an auto, the HT740 can take way more torque than the driveline or differential without breaking. I wouldn't recommend pulling on it very hard. Same for rocking back and forth with an auto, that's a no no. | ||
| mark (Coolbus)
Registered Member Username: Coolbus Post Number: 38 Registered: 7-2006 Posted From: 71.54.203.149 Rating: N/A |
It worked! Thanks gentlemen, for the suggestions. It was stuck shoes, apparently. And yes, it was a LAUNCH comeing down off my 'run up on' blocks! Wheeee! Thanks again for the responses. I posted my question on the MAK board also, so as to get as quick of a response (solution) as possible - had to get the bus moved rather quickly to make way for a shipping container I was getting delivered. As always, the help was much appreciated. Mark | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1006 Registered: 12-2000 Posted From: 74.12.88.180 Rating: N/A |
Mark, Take the bus for a drive and drag the brakes around a bit to get the rust off, or you'll be stuck again sooner. happy coaching! buswarrior |