martinf Posted June 5, 2017 Share Posted June 5, 2017 Hey all, woke up my mid seventies R six wheel logging truck after 6 years of sitting. Builds up pressure just fine, but when I press the brakes, a huge gush of air comes out the side of the treadle valve. I've not taken this valve out before, but it's coming out on the passenger side on a port of some King. Is that a exhaust vent? anyways, when I do that, the air cans nd brakes operate, but I lose way too much air. also, for reasons I haven't figured out, but I'm thinking are related, there's no air coming too my spring cans and when I operate the brake hand control unit, air dumps out of the treadle at that same port. ideas and suggestions sure appreciated! martin Quote 1965 Mack B-74, dump1974 Mack R, logging w/Prentice self-loaderwww.somewhereonthemountain.blogspot.com Link to comment https://www.bigmacktrucks.com/topic/50072-r-model-brake-troubles/ Share on other sites More sharing options...
j hancock Posted June 6, 2017 Share Posted June 6, 2017 Exhaust is out the bottom. Because of age and years sitting, one of the o rings in the treadle could be be bad. Could be a broken fitting or cracked line at the treadle body. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/50072-r-model-brake-troubles/#findComment-371615 Share on other sites More sharing options...
Hobert62 Posted June 7, 2017 Share Posted June 7, 2017 13 hours ago, j hancock said: Exhaust is out the bottom. Because of age and years sitting, one of the o rings in the treadle could be be bad. Could be a broken fitting or cracked line at the treadle body. What he said. I'm thinking broken fitting. Look for a loose airline hanging nearby. Quote Link to comment https://www.bigmacktrucks.com/topic/50072-r-model-brake-troubles/#findComment-371664 Share on other sites More sharing options...
martinf Posted June 7, 2017 Author Share Posted June 7, 2017 Thanks, guys. I'll check it out Quote 1965 Mack B-74, dump1974 Mack R, logging w/Prentice self-loaderwww.somewhereonthemountain.blogspot.com Link to comment https://www.bigmacktrucks.com/topic/50072-r-model-brake-troubles/#findComment-371687 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.