hicrop10 Posted December 25, 2016 Share Posted December 25, 2016 I have my brake treadle valve here.Someone else disassemble it for me and orbit to label the ports and which hoses go where.I thinking that the large one on the top of the first picture is the in port and all the rest would be the exhaust ports? Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/ Share on other sites More sharing options...
Hobert62 Posted December 25, 2016 Share Posted December 25, 2016 Just replaced mine. If you have issues there about $40 in ebay. I will be in trouble if I go to garage today but if I remember correctly and going off your first picture where it's upside down. All of the "top" ports are supply like a junction block. The one big line feeds it and I know my trailer hand valve supply came from there. Think I plugged the rest. The next section down went to the brakes- front axle, drive axle, and tractor protection valve for trailer brakes. The large round opening on end acted as the exhaust. This is going off memory only! 2 hours ago, hicrop10 said: I have my brake treadle valve here.Someone else disassemble it for me and orbit to label the ports and which hoses go where.I thinking that the large one on the top of the first picture is the in port and all the rest would be the exhaust ports? Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/#findComment-356047 Share on other sites More sharing options...
eddeere Posted December 25, 2016 Share Posted December 25, 2016 Going from memory also. The one on the bottom is supply. The smaller one on left is front brakes. One in center is truck brakes. Right is for trailer thru tractor protection valve.The one on bottom left connects to the manifold on air compressor. There could be one on front small in size goes to the dry road slippery road switch in cab. Just put my floor back in so all this is memory. I am sure there there is someone here who knows than I. Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/#findComment-356054 Share on other sites More sharing options...
hicrop10 Posted December 25, 2016 Author Share Posted December 25, 2016 Thanks for the help,it all makes sense now.Am going to hookup the supply line to it and depress petal. Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/#findComment-356056 Share on other sites More sharing options...
Hobert62 Posted December 25, 2016 Share Posted December 25, 2016 All the bottom ports are the same and all the top ports are the same. The valve lets air from the bottom half of the valve travel up towards the foot pedal and exit through the top ports. Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/#findComment-356062 Share on other sites More sharing options...
mowerman Posted December 29, 2016 Share Posted December 29, 2016 let me know if you need any more help....i have 3 big mack manuals from 1983.....bob Quote Link to comment https://www.bigmacktrucks.com/topic/48109-need-some-help/#findComment-356398 Share on other sites More sharing options...
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