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Old 04-07-2013, 11:16 PM   #1
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Air brake compressor slow.

I haven't used my 99 gulfstream DP for about 18 months, been parked outside by my garage. I started it up today and the air brake pressure took forever to build up, like 20 minutes or longer, with engine above 1500 rpm. Once it did and I bleed it down, using the brake peddle, it took a long time to rebuild pressure again. It un-loads at about 125 lbs. What/where can I start to look first to find out why this is happing. Thanks.
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Old 04-08-2013, 04:48 AM   #2
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Here is a good guide: RV Air Systems

When you shut it off are you hearing excessive air leaks anywhere?
If the suspension is completely empty, mine can take close to 10 minutes to completely air up at idle.

As a rule of thumb, I've always been told it should take about 1 minute to re-pressurize the tanks from 70-100 psi @ 1200 rpm once the suspension system is fully aired. Let it air up until it 'sneezes' then work the pedal until it's about 70psi. Hold the rpm at 1200 and see how long it takes to get back to 100psi.
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Old 04-08-2013, 04:53 AM   #3
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If you do not hear any air leaks and the pressure holds you might want to replace the air filter and desiccant. Should be done every two years anyway. I will bet you have air leaking out of the system.
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Old 04-08-2013, 04:58 AM   #4
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A good troubleshooting guide from Bendix for reference: http://www.bendix.com/media/document...otingguide.pdf
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Old 04-08-2013, 06:17 AM   #5
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Quote:
Originally Posted by frank1 View Post
I haven't used my 99 gulfstream DP for about 18 months, been parked outside by my garage. I started it up today and the air brake pressure took forever to build up, like 20 minutes or longer, with engine above 1500 rpm. Once it did and I bleed it down, using the brake peddle, it took a long time to rebuild pressure again. It un-loads at about 125 lbs. What/where can I start to look first to find out why this is happing. Thanks.
First place to look is replace the air governor. It should be located right near the compressor on the motor. I've had one go out and now, always carry a spare. They cost less than $30.00. From your description, I suspect you'll have to get a rebuilt compressor installed.

I did have an air compressor that failed when we were on our trip around Alaska and had to have it replaced in Fairbanks. Tried all the other suggestions that have been made and none worked. Compressor was replaced with a rebuilt one that had to be flown up from Spokane and problem solved. My compressor failure was the same as you describe.
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