barry123 Posted October 20, 2013 Share Posted October 20, 2013 Hi can someone help me, I'm trying to activate the exhaust brakes of my Mack Vision but there is a switch on the dash that doesn't work. It could be the exhaust or engine brake not too sure the switch has got three steps. Could it be an electrical issue?cheersBARRY Quote Link to comment https://www.bigmacktrucks.com/topic/33196-exhaust-brake-not-working/ Share on other sites More sharing options...
slpwlker Posted October 20, 2013 Share Posted October 20, 2013 Might try hitting the brakes. SOmetimes people set them to activate on the brake pedal. My truck was set up like that and I had it removed to work as soon as you back off Quote Link to comment https://www.bigmacktrucks.com/topic/33196-exhaust-brake-not-working/#findComment-212478 Share on other sites More sharing options...
hatcity Posted October 20, 2013 Share Posted October 20, 2013 Bad switch?bad fuse?wire disconnected somewhere?remove dash panel where fuses/circuit breakers arecheck the diagram for proper breaker, replace with a known good or put a jumper wire in to see if that is where the problem isYou can reach behind the switches and shake some wires around, maybe a loose connection Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/33196-exhaust-brake-not-working/#findComment-212498 Share on other sites More sharing options...
Challenger Posted October 20, 2013 Share Posted October 20, 2013 The 3 position switch should be your engine brake. Do you have an exhaust brake? If you have an exhaust brake you will see it on your exhaust pipe. If you dont see anything on the exhaust pipe, you dont have an exhaust brake. I dont think Ive ever seen a vision with an exhaust brake. Does your cruise or high idle work? If not, it could be a clutch switch out of adjustment. The switch is mounted on the clutch pedal. Push the clutch pedal down and you should hear it click. Quote Link to comment https://www.bigmacktrucks.com/topic/33196-exhaust-brake-not-working/#findComment-212574 Share on other sites More sharing options...
rsb502 Posted October 21, 2013 Share Posted October 21, 2013 Wow, yeah that should be the switch but there are multiple reasons why it may not work, air pressure switch, clutch disengage switch, breaker, relay, solenoids, ecm function output, ecm function input, yeah cant figure that one out from here. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33196-exhaust-brake-not-working/#findComment-212624 Share on other sites More sharing options...
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