Full Floater Posted July 6, 2018 Share Posted July 6, 2018 It appears that one of my brake chambers is not fully releasing on my 78 RS600L, w/Mack rear ends; and is in need of replacement. Are these just regular type 30 chambers, or are they anything specific being on a Mack? Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/ Share on other sites More sharing options...
mrgumby Posted July 6, 2018 Share Posted July 6, 2018 Looks like a regular 30/30 air can 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402057 Share on other sites More sharing options...
Swishy Posted July 6, 2018 Share Posted July 6, 2018 could B 24/24 a broken spring can stop m from fully releasing or the seal Between the 2 chambers may B leaking on either th@ chamber or the one opposite cya §wishy Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402058 Share on other sites More sharing options...
theakerstwo Posted July 7, 2018 Share Posted July 7, 2018 I have seen 20/30 on mack also/ Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402064 Share on other sites More sharing options...
blackdog2 Posted July 7, 2018 Share Posted July 7, 2018 Sometime the bracket will flex rubbing rim with 30/30 but you can cut off excess 5/8 rod put through spider and hold bracket away bigger can better braking check the rest should be the same . Quote Ed Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402074 Share on other sites More sharing options...
davehummell Posted July 7, 2018 Share Posted July 7, 2018 Check if someone put a long stroke or if standard stroke you don't really want to mix them together. long stroke has square boss around air fitting holes. Watch how you cut the rod off length is very important, always run the nut down the threads and then cut it to length. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402077 Share on other sites More sharing options...
terry Posted July 7, 2018 Share Posted July 7, 2018 54 minutes ago, davehummell said: Check if someone put a long stroke or if standard stroke you don't really want to mix them together. long stroke has square boss around air fitting holes. Watch how you cut the rod off length is very important, always run the nut down the threads and then cut it to length. good to know, didn't realize that. terry Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402081 Share on other sites More sharing options...
Full Floater Posted July 7, 2018 Author Share Posted July 7, 2018 Very helpful tips guys, thank you. The boss around the air fitting is round. So I guess that would be standard stroke? All the other cans have round bosses as well. I will be going down to the truck shop today and will purchase a 30/30 can and see how it goes. Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402098 Share on other sites More sharing options...
Full Floater Posted July 12, 2018 Author Share Posted July 12, 2018 Got the can changed out no problem. Now everything is working 100% again. That brake is fully releasing now. Which it wasn't before. Thanks again! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53752-type-30-chambers-on-1978-r/#findComment-402360 Share on other sites More sharing options...
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