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Topic: Air brakes wont release /trans wont move from neutral (Read 891 times) previous topic - next topic

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Air brakes wont release /trans wont move from neutral
Good morning Fortravel GODS, I went to move my coach this morning backed up about 30 foot all ok tried to move forward nothing, backed up 10 foot all ok tried to move forward nothing now air brakes wont release /trans will only go into or show...

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Re: Air brakes wont release /trans wont move from neutral
Reply #1
Parking brake release isn't working. The coach will back up cold with parking brake on but has to be released to move forward.

  • rbark
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Re: Air brakes wont release /trans wont move from neutral
Reply #2
What is your air pressure? If under #60 they won't release.

Re: Air brakes wont release /trans wont move from neutral
Reply #3
Any audible or visual alarms showing on the dash?

Parking brake not releasing is a mechanical problem with air system.  See question above on air pressure.

Transmission not going into gear could be a electronic problem.  What is idle rpm?  If idle...

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  • Last Edit: June 25, 2020, 09:42:00 am by Chuck & Jeannie

Re: Air brakes wont release /trans wont move from neutral
Reply #4
Build full air pressure and try to release. If no joy, repeat and repeat again. I had a DD-3 can stick at Rocky Mountain NP on my bus. I must have tried at least 50 times when it finally released. Never did that again but I rebuilt it when I got...

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Re: Air brakes wont release /trans wont move from neutral
Reply #5
So air pres at 120 #
HWH green travel light lit no other warnings
Park brake light lit when park brake applied goes off when released (sounds normal) can see pres drop on air gauge
RPM at about 525 at idle
Both N's are lit on allison keypad (looks...

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Re: Air brakes wont release /trans wont move from neutral
Reply #6
Both N's are lit on allison keypad (looks normal)
So, nothing happens when you use the keypad? Pushing buttons does nothing at all? I would try pulling the pad connectors and replacing. Same with...

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Re: Air brakes wont release /trans wont move from neutral
Reply #7
A '96 U-270 has ADB-1560 not "S" cam drum

https://www.foreforums.com/index.php?action=media;sa=media;in=1701

Mike

Re: Air brakes wont release /trans wont move from neutral
Reply #8
A '96 U-270 has ADB-1560 not "S" cam drum

https://www.foreforums.com/index.php?action=media;sa=media;in=1701

Mike

You're right.  I forgot about disk brakes, so please tell me this:  Can you see...

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  • bbeane
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Re: Air brakes wont release /trans wont move from neutral
Reply #9
You can see the slack adjuster move

Re: Air brakes wont release /trans wont move from neutral
Reply #10
How were you able to back up if shift pad was in neutral? Or did this problem just come up after you moved the coach?

Re: Air brakes wont release /trans wont move from neutral
Reply #11
You can see the slack adjuster move
So, would you say that if it doesn't move and does after a gentle tap with a hammer it's time to service the mechanism?

And just asking out of curiosity, if you...

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Re: Air brakes wont release /trans wont move from neutral
Reply #12
So the first time I backed it up and stopped it would not go forward then I moved it back another 10 feet and tried to go forward and nothing now no reverse no forward. Put Trans back in neutral ,brakes locked up Seems like both problems happened...

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Re: Air brakes wont release /trans wont move from neutral
Reply #13
So the first time I backed it up and stopped it would not go forward then I moved it back another 10 feet and tried to go forward and nothing now no reverse no forward. Put Trans back in neutral...


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  • NancyS
  • [*][*][*][*]
Re: Air brakes wont release /trans wont move from neutral
Reply #14
Has this puppy got Maxies on it?

Re: Air brakes wont release /trans wont move from neutral
Reply #15
and using a helper that didn't have it in for me,

I know little off subject, but I canceled my $1,000,000 life insurance policy after 3 attempts.

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Re: Air brakes wont release /trans wont move from neutral
Reply #16
I know little off subject, but I canceled my $1,000,000 life insurance policy after 3 attempts.

Said the man with the practically fly by wire Foretravel.

Is the transmission in your '97 U295...

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Re: Air brakes wont release /trans wont move from neutral
Reply #17
He listed it in the beginning as

1996 u-270
8.3 cummins
build #4794

Re: Air brakes wont release /trans wont move from neutral
Reply #18
Tonka

Do you have the owners manual for the transmission? It does have electronic functions that will disable shifting if "Check Transmission" light is illuminated.

Re: Air brakes wont release /trans wont move from neutral
Reply #19
Here is a copy of the manual I got off their site. Don't know if it your specific transmission or not. It is also for the 3000 series as well.

Re: Air brakes wont release /trans wont move from neutral
Reply #20
Has this puppy got Maxies on it?

For those of you younger than a certain age, Maxi Brakes was the trade name for the first of the spring set parking brake.  Before that all a truck had was a...

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Re: Air brakes wont release /trans wont move from neutral
Reply #21
Here is a copy of the manual I got off their site. Don't know if it your specific transmission or not. It is also for the 3000 series as well.
I love reading manuals.

"NOTE: Turn off the vehicle...

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Re: Air brakes wont release /trans wont move from neutral
Reply #22
Said the man with the practically fly by wire Foretravel.

Is the transmission in your '97 U295 computer controlled?

Yes. That and the AC thermostats are the only things computer controlled in...

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Re: Air brakes wont release /trans wont move from neutral
Reply #23
Maybe there is an air line run to the ECU or it reads a gauge?

Re: Air brakes wont release /trans wont move from neutral
Reply #24
Yes. That and the AC thermostats are the only things computer controlled in that coach.

So I just gotta ask, and it's something you would do without thinking:  Is there a brake interlock?  As...

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