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Old 06-10-2015, 09:36 PM   #1
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Exhaust Brake Inop

Have air to brake control valve. Disconnected electrical connector and applied 12 volts to the valve. it opened and allowed air to the exhaust brake actuator and exhaust brake worked each time voltage applied to control valve. Is there a fuse I cannot find? Also is there a switch on the accelerator that allows voltage to air valve when not depressed and breaks circuit when you push on accelerator that could be defective?
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Old 06-10-2015, 11:31 PM   #2
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David......Your new and welcome.....to start, you need to tell us what kind of RV you have, Make, Model, Engine, Year etc.

Second, how do you know it's not working. You can't test them while stationary. Most don't operate below 15 mph. What does your transmission say is happening? Does the coach downshift and does your trans window go to 2nd gear or 4th gear.
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Old 06-11-2015, 07:51 AM   #3
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My exhaust brake won't work if I am cruise control mode. I have to cancel or tap the brakes for the exhaust brake to come on.

I know on my coach there is a micro switch in the brake pedal that sends a signal for the exhaust brake to active. The switch does fail but is replaceable. Your coach may be different.
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Old 06-11-2015, 08:21 AM   #4
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I was taught how to check the exhaust brake by my mechanic. Downshifting of the transmission alone will give the perception that the exhaust brake is working by slowing the coach.

Procedure:

While driving down the highway, try to find a section with concrete barriers or a grove of trees on the drivers side. Open your drivers window and apply your exhaust brake. You should hear an audible "Hissing" sound once the exhaust brake cuts in as the exhaust brake restricts the flow of air. No "hissing" or change in audible sound and your exhaust brake is not working. Something is inoperable. The butterfly/gate valve being seized is usually the culprit!

On two coaches I've bought, I had seized butterfly valves inside the exhaust brake. One I was able to remove the exhaust brake, soak the assembly and vibrate it loose with an air hammer. The other, an atomic bomb wouldn't have budged it and I had to replace it.
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