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Open Roads Forum  >  Class A Motorhomes

 > Air Brakes Won't Release

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Roadglider09

Florida

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Posted: 03/07/12 09:53am Link  |  Print  |  Notify Moderator

Went to move my 98 Dynasty yesterday, and when I hit the mushroom switch, the brakes didn't release. I had 110 pounds of air on the gauge, and when I pushed and pulled the switch I could hear the air both build and release. I tried both forward and release. Finally, after hitting the switch 6 or 7 times, the brakes released. I live in Florida, so they're not frozen. Any ideas where I should start troubleshooting?


Michael & Donna
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paulcardoza

Southeastern Massachusetts

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Posted: 03/07/12 09:56am Link  |  Print  |  Notify Moderator

Had the RV been sitting for a while? Maybe they were just rusted in place and you won't have any issues after a short drive.


Paul & Sandra
New Bedford, MA
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bluwtr49

Green Valley, AZ

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Posted: 03/07/12 10:03am Link  |  Print  |  Notify Moderator

Agree, problably just stuck.

Does your E-Brake use a disc brake on the driveshaft?? If so, it could mean that the pins need a bit of lubricant.


Dick

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rvrepairnut

bc

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Posted: 03/07/12 10:09am Link  |  Print  |  Notify Moderator

bluwtr49 wrote:

Agree, problably just stuck.

Does your E-Brake use a disc brake on the driveshaft?? If so, it could mean that the pins need a bit of lubricant.

hello?? Its a diesel pusher with air brake system
Note to OP I have seen this happen a few times when coach is left in same position over a period of time the brake shoes seize(rust) to the drum.Usually just put it in revese and forward a couple times to rock it and they break free

Roadglider09

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Posted: 03/07/12 10:13am Link  |  Print  |  Notify Moderator

I drove the coach last weekend, so I know they're not rusted. As for the brakes, I know it has air cannisters on the front, and I thinker on the back also, but I'll have to crawl under and check the rears.

RCtime

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Posted: 03/07/12 10:14am Link  |  Print  |  Notify Moderator

Put it in D, apply some power, the R, apply some power, back and forth, you will hear a bang when they release. Mine did that when a slight rust build up froze them.
If that doesnt work, get a mallet or big hammer and crawl under and bang on the drums and retry the above.


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johntichy

Florida

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Posted: 03/07/12 10:32am Link  |  Print  |  Notify Moderator

You just have corrosion build up. Best thing is just go to reverse. 9 out of 10 times that will release the brakes.

jorbill2or

Oregon

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Posted: 03/07/12 11:10am Link  |  Print  |  Notify Moderator

Air brakes are locked on by massive spring pressure the air pushes against the spring to free the brakes .. They can and do become " stuck " on occasion backing and forward movement and pressure normally frees them. It is not a real concern as long as the really come free. There are info and classes on air brake operation that every do owner should see /take. These systems work differently than hydraulic systems and should be checked differently slack adjusters etc.


Bill

Roadglider09

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Posted: 03/07/12 11:49am Link  |  Print  |  Notify Moderator

Thanks for all the advice. Sounds like this is not a major problem. I will look at some info on air brakes and check what I have.

Mike

pigman1

Delaware

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Posted: 03/07/12 04:18pm Link  |  Print  |  Notify Moderator

When was the last time you had the drums off and lubed the brake rub points and "S" cams? Meritor recommends each 6 months, which in my opinion is way too often. I do my own maintenance and do the cleanup and re-lube every 2 years. We run between 10 and 25,000 miles a year. The wheels and drums need to be pulled, the cams, the roll pins and the rub points need to be cleaned and re -lubed with a special high temp brake lube. NAPA has a special brake lube that's purple and it works well.

No doubt you had a rust issue, but keeping the rest of the parts correctly lubed goes a long way to keeping the brakes from binding up when left engaged for a long time.

John


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