apotro Posted August 11, 2014 Share Posted August 11, 2014 My 1985 MH600 has been seating for two years. Recently, i started the truck to drive around but the air and brake lights stay on and will not die off. Also when i put it in either reverse nor drive, the truck will not move. Any idea why this happening? Quote Link to comment Share on other sites More sharing options...
farmer52 Posted August 11, 2014 Share Posted August 11, 2014 Sounds like your brakes are not releasing. Likely "frozen" from sitting. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
pmolitor Posted August 11, 2014 Share Posted August 11, 2014 Try your hand brake or Johnny bar. I've grabbed mine accidentally and didn't know it 1 Quote Link to comment Share on other sites More sharing options...
hatcity Posted August 12, 2014 Share Posted August 12, 2014 Are you building sufficient air pressure?If the air lite is on, that may be the starting point.Low air will keep the brakes on too 1 Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
farmer52 Posted August 12, 2014 Share Posted August 12, 2014 Good point hat. I was "assuming" (I know - ass you me) that he had sufficient air pressure. If there is not enough air pressure the parking valves will "pop out" instead of staying "in". The valves need to stay "in" to release the brakes.I had an MH that after it sat for a few weeks or months would not release the brakes. I would "jack" around with the foot treadle and try to move the truck forward and backward and finally they would release. Seems the pads would stick to the drums.Be careful when trying to move the truck forward/backward, you could twist the driveshaft or break a u-joint/yoke. 2 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
MackTech Posted August 14, 2014 Share Posted August 14, 2014 How much air do you have? Needs to be built up enough. Or your pressure switch(s) may be bad, not sure if they are wired or not. Quote Link to comment Share on other sites More sharing options...
apotro Posted December 7, 2014 Author Share Posted December 7, 2014 Thank you all for your contributions. Has anyone thought about Air Caging. Am just saying but what do you think? Quote Link to comment Share on other sites More sharing options...
GreenGiant2 Posted December 7, 2014 Share Posted December 7, 2014 is the brake pedal stuck down. this will make the brakes stay on and also the lites 1 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
gearhead204 Posted December 7, 2014 Share Posted December 7, 2014 With the brakes released and wheels choked grab the slack adjusters and see if there loose, if so see if the shoes will move. If slacks don't move ckeck for air at the emergency port of the air can. Quote Link to comment Share on other sites More sharing options...
apotro Posted December 8, 2014 Author Share Posted December 8, 2014 GreenGiant2 - No but the brake pedal is not stuck down Quote Link to comment Share on other sites More sharing options...
apotro Posted December 8, 2014 Author Share Posted December 8, 2014 gearhead204 - Thanks a lot I will try that tomorrow. Quote Link to comment Share on other sites More sharing options...
GreenGiant2 Posted December 8, 2014 Share Posted December 8, 2014 the plunger in the foot valve could be. Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment Share on other sites More sharing options...
Ezrider Posted December 9, 2014 Share Posted December 9, 2014 im a little confused, the light your talking about is it the low air light? or break lights on the back of the truck? do you have air pressure in the tanks? Quote Link to comment Share on other sites More sharing options...
rsb502 Posted December 29, 2014 Share Posted December 29, 2014 If the air pressure light and brake lights are on its gotnlow air pressure at the switch and if the brakes won't release its either low pressure or they are stuck. When you try to move it does the brake knob stay depressed on the dash? If not there isn't enough air to release the brakes. If so make sure your getting air to the brake chambers by removing an emergency line from a brake chamber and have someone release the parking brakes and make sure you have air at the line. If there is air at the chambers and the knob stays in on the dash smack the back edge of the brake drum with about a 3-5# hammer with the brakes released and the wheels chocked, if they are stuck to the drum that should break them free. 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 Share on other sites More sharing options...
bobcotkg Posted December 30, 2014 Share Posted December 30, 2014 I'm with green giant. That button under the pedal sticks, happened to the truck I drive frequently after it sat for a week, on my LTL ect. They suck how they are designed.Pry it up with a bar and squirt some panther piss on it Quote Link to comment Share on other sites More sharing options...
bobcotkg Posted December 30, 2014 Share Posted December 30, 2014 Just pulling up on the pedal will not free the button Quote Link to comment Share on other sites More sharing options...
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