gra511 Posted November 6, 2014 Share Posted November 6, 2014 On my superliner I have a Neway suspension,it airs up fine but I can",t get the switch on the dash to work. With the truck running and the bags full of air the switch is useless. I have even removed the switch to see if air would come out of the 2 lines but nothing happened. Does anyone know if it uses air to exhaust the bags? My parts manual shows that one line goes to a air manifold on the firewall, I cracked that like and no air was present. Any suggestions appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/37634-cannot-dump-air-bags/ Share on other sites More sharing options...
ws721 Posted November 7, 2014 Share Posted November 7, 2014 You probably have an air operated "slave" valve back by the air leveling valves. Yes you need air to make it dump. As to why you don't have air at the dash valve is odd. Follow the supply line back to a source. You need at least 60 lbs of air in order for it to work. Now you may have a different set up but im betting that youre Neway is air Slave valve to make it dump Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/37634-cannot-dump-air-bags/#findComment-265900 Share on other sites More sharing options...
thomastractorsvc Posted November 7, 2014 Share Posted November 7, 2014 Are you changing from summer air to winter? I already did the tires on my trucks. 1 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/37634-cannot-dump-air-bags/#findComment-265902 Share on other sites More sharing options...
gra511 Posted November 8, 2014 Author Share Posted November 8, 2014 Thank you Bulldog for your idea, I will follow the line out maybe its pinched somewhere or the mice came back. Thomas it isn't the summer or winter air that concerns me,its the fact that I have trumpet hooked up to the exhaust on the valve. It plays "Tapps" as the bags deflate. Quote Link to comment https://www.bigmacktrucks.com/topic/37634-cannot-dump-air-bags/#findComment-265956 Share on other sites More sharing options...
gra511 Posted November 13, 2014 Author Share Posted November 13, 2014 Found the problem, couldn't figure out where the air to power the air bag switch was. The air for the switch comes from the treadle valve(brake pedal) . A quarter inch air line leads to a valve on the firewall just underneath where the wire harness is. Took valve apart and reassembled, works fine now. The valve to air up the bags comes off of one of the air tanks. Quote Link to comment https://www.bigmacktrucks.com/topic/37634-cannot-dump-air-bags/#findComment-266551 Share on other sites More sharing options...
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