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Old 11-16-2020, 05:00 PM   #1
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Join Date: Oct 2019
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Air Brake Help

Hi, friends. First post here.

I just bought an 82 Thomas diesel pusher. It starts and runs like a dream. Problem is the air brake compressor needs repair or replacement.

The seller was super helpful and even showed me where to attach an air hose to pressurize the tanks with a portable gas powered compressor, which I will need to do to move it.

My conundrum is he said I'd need 150 psi to do the job but I can't find anyone who rents such an animal.

Does that pressure sound accurate?

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Old 11-16-2020, 05:08 PM   #2
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20-40 psi to release the spring brake for towing.
60-85 to deactivate the low air warning if key switch needs to be on (unlikely for towing).
90-120 is normal system pressure for driving.
150 is system limit (safety valve relieves pressure to 90-120).

I recommend you have it towed for repair or repaired on site. Do NOT drive with an air system problem -- it is unsafe.
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Old 11-16-2020, 05:16 PM   #3
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Eeeexcellent. Thanks for those numbers.

Also, I'll heed your towing advise.
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Old 11-17-2020, 07:26 AM   #4
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If you're having it towed, let the tow company and driver worry/handle it. They can tow it to their shop and repair the compressor for you then.
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Old 11-17-2020, 07:34 AM   #5
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Quote:
Originally Posted by Ski Patroller Geo View Post
Eeeexcellent. Thanks for those numbers.

Also, I'll heed your towing advise.
Quote:
Originally Posted by Booyah45828 View Post
If you're having it towed, let the tow company and driver worry/handle it. They can tow it to their shop and repair the compressor for you then.
Yeah, I was going to say, do not attempt to tow this thing yourself unless you are qualified and have the right equipment, it probably needs a Class 7 truck with 8-10-ton boom, minimum.
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