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Old 10-13-2021, 03:01 PM   #1
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Roadmaster ADDaBrake 8800 not working

Hi, I have a used Roadmaster ADDaBrake 8800 I am testing it, and I plug it it and compressor runs then stops withing a minute. I am able to adjust the air pressure just fine. The instruction say to press the test button and the unit is supposed to cycle 3 times as it presses the brake pedal. Nothing happens. I did test the breakaway switch. As soon as I pulled the pin, the ADDaBrake started up, but did not push the pedal. Any ideas what issue might be?

Thank you.


Kerry
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Old 10-13-2021, 03:07 PM   #2
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Have you called Roadmaster? They have some pretty good troubleshooters.
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Old 10-13-2021, 05:12 PM   #3
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Hi Brett,


Thanks for responding. Yes I called. They said its an old model and that it might be control board. Did not off any other suggestion. I opened unit up and it is very clean. Nothing looks out of place.
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Old 10-13-2021, 08:46 PM   #4
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The Add A Brake is a rather old unit I think they were discontinued about 12 years ago, if I were to guess maybe something has went wrong on the control board, a common failure item on aging electronics are electrolytic capacitors going bad.
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