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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.


Ron
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johntichy

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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

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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.


My post's are my opinion The advice, comments etc are free and worth what you paid

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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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