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Old 09-25-2016, 07:58 PM   #15
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Air brakes

RufusEarl pay attention to the following comments please

1- An air compressors performance is measured by it`s capacity to build air pressure from 50 to 90 PSI in 3 minutes or less with the engine running at 1200 RPM. This is known as compressor build up time. Excessive build up time is caused by:
-A plugged compressor intake
-Excessive system leakage
-A faulty or worn out compressor

2- The governor limits maximum normal operating air pressure at 120-135 PSI. As previous poster mentioned this is your cut out pressure.........this is when the governor cuts out the compressor preventing further air pressure build up.

3- As the driver uses the brakes , air pressure in the system drops as air is delivered from the tanks. When system pressure drops by 20-25 PSI the governor causes the compressor to cut-in and more air is supplied to tanks.

4-If cut-out or cut in pressures are not within these specs governor - system maintenance must be performed by a Heavy Equipment Tech.

5-The air dryer integrated system (AD-IS ) combines the governor ,dryer,safety valve and supply tank into ONE system. If you possibly have miss- matched components you have trouble......and it sounds like you do.

6-There are all types of repairs associated with a Motor Home......do not attempt backyard repairs on the air brake system. You owe it to the motoring public to have your unit professionally repaired before you go anywhere.
Not trying to be rude.......I have experience with these systems.

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Old 09-25-2016, 11:48 PM   #16
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Location: Nine Mile Falls WA / Arizona City AZ
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rider fan is correct.... the company I owned used to rebuild these compressors and I can share that 80% of the units returned to us as cores had no issues other than some other issue in the air system that was in correctly diagnosed... I've not read enough in this thread to offer more information.....

Except that... I'd like to know what the first problem was... that required the replacement of both the drier and the compressor...

Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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Old 09-26-2016, 09:26 PM   #17
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Old 09-27-2016, 10:15 AM   #18
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Air Brakes

Gee Rich , I,m an old guy and can't de-code your "Troll" remark.
Care to comment on your real thoughts............
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Old 09-27-2016, 08:53 PM   #19
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Originally Posted by deandec View Post
He likely has an "air throttle valve" behind the accelerator pedal as I do in the same vintage Country Coach.

It needs air pressure to respond although 90 psi should work for the throttle.
Ok thanks for the clarification. I have seen setups like that back in the 60's and 70's but didn't think they would be used in the 90's.

Dennis & Marcie & Hook The Jack Russell, 2001 HR Imperial 38wds 350 Cummins, 07 Chevy Trailblazer/Blue Ox/Ready Brake, 04 Dodge 3500 Cummins,
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air brakes, brake, brakes

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