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?
2006 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2019 Chevy Equinox Premier