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Type 30 Chambers on 1978 R

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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?

IMG_1113.JPG

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Looks like a regular 30/30 air can

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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

images?q=tbn:ANd9GcTRhMX6kLDjPfpWxo31SJp

cya

§wishy

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I have seen 20/30 on mack also/

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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 .

 

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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.

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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:MackLogo:

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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.

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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!

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