NCN Posted August 4, 2020 Share Posted August 4, 2020 I have a 2001 RD688 Tandem dump 15' body, I think I'm the third owner. My problem is that the trolley brake leaver that should become live for the trailer after the trailer air is activated is live all the time. When the trailer valve is activated I have no trailer air at the rear port. High pressure brake air is present at the rear but no trailer brake air. Looking for answers if anyone can help Quote Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/ Share on other sites More sharing options...
tjc transport Posted August 5, 2020 Share Posted August 5, 2020 Sounds like it may be hooked up to truck brakes instead of trailer brakes 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/#findComment-457712 Share on other sites More sharing options...
Quickfarms Posted August 5, 2020 Share Posted August 5, 2020 What happens when your helper presses on the foot valve? Quote Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/#findComment-457714 Share on other sites More sharing options...
JoeH Posted August 7, 2020 Share Posted August 7, 2020 Recent problem or did you just aquire it and you're trying to figure out what's going on? How's your tractor protection valve? Do you have your lines hooked up right to the trailer? One is a supply line to the trailer air tanks, the other is a signal line. Sometimes trailers/trucks get the fittings switched up because an idiot worked on it. Quote Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/#findComment-457842 Share on other sites More sharing options...
JoeH Posted August 7, 2020 Share Posted August 7, 2020 It's also very common on dump truck applications for the trolley brake to operate all truck brakes except steering axle. That's how our triaxles are. Quote Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/#findComment-457843 Share on other sites More sharing options...
storkmack Posted August 7, 2020 Share Posted August 7, 2020 Most mixers are set up this way also. Quote Link to comment https://www.bigmacktrucks.com/topic/63604-ncn/#findComment-457874 Share on other sites More sharing options...
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