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Old 04-02-2016, 01:16 PM   #11
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Yeah, usually shifting from drive to reverse several times will jolt them enough to cause them to release. It's better than crawling underneath and beating on the brake drums.
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Old 04-02-2016, 01:47 PM   #12
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Quote:
Originally Posted by johnbloem1974 View Post
I would crank the engine to get the tanks filled, and you should be able to release the brakes... After that long a time, I'm not sure any vehicle would have any air left in the tanks...

If you mean crank with the starter until you build up pressure, that's a bad idea
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Old 04-02-2016, 03:15 PM   #13
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Even with a big battery I don't think you could build up enough air pressure by cranking the starter.
His bus already runs and builds pressure. Just needs to rock it back and forth or beat on the drums as a last resort.
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Old 04-02-2016, 03:24 PM   #14
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Take it from a truck driver, it's best to chock the wheels, let the bus idle until warmed up & the air systems are up to operating pressures, push in the brake release, & leave the bus run until the pressures are back up to normal. This may take 15 minutes or more depending on how well your Air system & brakes have been taken care of.
Rocking the vehicle (start by putting it in reverse first) is a way of checking to see if they are loosening, but ultimately knocking on the drums is usually needed.
good luck, & be patient.
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Old 04-02-2016, 09:22 PM   #15
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I guess I should have clarified that I meant crank the engine to get the engine running....then with the engine running, the tanks would fill......



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Old 04-04-2016, 07:39 AM   #16
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how high does your pressure get? if you push the park brake release in. . and then pull it back out 15 seconds later you should hear an air release... these are your Spring brakes...

if you dont hear an air release when you pull the release back out then likely you are never pressurizing the rear brake air cylinders.. all the rocking back and forth in the world wont release them if they arent getting pressurized when you press in the release..

your bus should either have 2 air gauges or a singke gauge with 2 needles.. originally they were green and orange needles..

you need to make sure both are coming up.. if only one needle is coming up or your pressure is not coming up high enough then you cannot press in that yellow park-brake release and expect it to release those springs in the rear....

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Old 04-04-2016, 08:51 AM   #17
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when you chock the wheel make sure you chock them on both sides so it can not roll forward or backwards, 1st time may make you pee a little

I have a pc of steel rod I use so I am away from tire some, insert end on top of shoe resting against the web, tap a couple times with 2 pound hammer, you can see if the pads are stuck to drum

make sure you have air pressure built up and bus in neutral!!!

again chock tires on both sides and do not have arms or legs under the tires when they brake loose
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Old 04-04-2016, 11:13 AM   #18
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Before you go under it, release the brakes, step on the brake pedal hard. 9 out of 10 times that will release them.
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Old 04-05-2016, 04:05 PM   #19
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....seized slack or "S" cam?
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Old 04-05-2016, 05:04 PM   #20
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Haven't gotten back to the bus... working retail blows. I'm going to try the hammer on Thursday and hope for the best.
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