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Old 09-13-2014, 01:40 PM   #1
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Brakemaster 9000 troubleshooting

Symptom: compressor pumps continuosly.

Haven't done the soapy water test on fittings yet, but there is an audible
air leak at the solenoid valve which is attached the the pro portioning valve.
The air seems to be coming from the top of the valve body and not the in and out fittings. Pressure in the air tank drains out rapidly after switching on the engine.

Any suggestions for a quick fix. We're in the middle of nowhere at the moment



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Old 09-16-2014, 05:08 PM   #2
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Are the valves to which you refer on the coach or the toad (in the Brakemaster)? If the proportioning valve is one that is part of your coach chassis air brake system, why not just disconnect the toad bake line for now? You won't stop quite as fast, but any large diesel coach should have no trouble stopping a toad.

On the other hand, what's thr problem if the coach air compressor is running a lot? It cycles all the time anyway and should have plenty of excess capacity. Wait a minute: Is this perhaps a gas chassis coach with the add-on compressor exclusively for the Brakemaster? That's maybe a different story...

By the way, do we know each other from years ago? RVForum?

Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 09-16-2014, 06:55 PM   #3
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Sounds like you are asking about the 9060 Brakemaster. For a gas coach , if you are talking about the quick exhaust valve , Air should not be on the brake or air line until the coach brake is pressed. More info please.
Walt & Will
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Old 09-17-2014, 04:02 PM   #4
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If it's on the 9060 gas model there's also a drain valve on the air storage tank. The storage tank is inside the enclosure that also houses the pump. The older models have needle valve that needs a couple turns to fully open or close. The newer models have a ball valve that only requires turning the handle 90*

If the pump runs continuously it will overheat and stop. There's a heat sensor in the pressure switch that will shut the pump off long enough to cool down. Once it cools sufficiently it will restart. If you can't find the leak you can just disconnect one of the wires from the relay inside the enclosure. Again you won't have brakes on the towed vehicle, but you won't destroy the pump by overheating it numerous times.
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