Freightrain Posted November 12, 2018 Share Posted November 12, 2018 When I release the parking brakes, sometimes I've had to pump the brake pedal to get them to release and let the truck roll. Just started it the last trip I made a few weeks back. I think it's the right rear. I release the brakes and try to adjust the slacks and the RR seems to be still tight. Once you pop it, then you can adjust it. Don't think the S cam is sticking in the bushing as it moves easily. Hope it is just a brake shoe/roller/spring/etc. Don't think it is the can? Don't see how that could be, but haven't pulled the pin out. Need to have a buddy stop over so I can crawl under and watch what is going on when the brakes release. Hard to be at two places at once? I try sometimes. Only bad thing, I have to have the truck OUTSIDE to get the axle out to get the drum off....UGH. Weather has already taken a turn for the worse so not sure when I'll get to it. Don't need the truck til next April, so it's not a big deal(yet). Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/ Share on other sites More sharing options...
carlotpilot Posted November 12, 2018 Share Posted November 12, 2018 (edited) 21 minutes ago, Freightrain said: When I release the parking brakes, sometimes I've had to pump the brake pedal to get them to release and let the truck roll. Just started it the last trip I made a few weeks back. I think it's the right rear. I release the brakes and try to adjust the slacks and the RR seems to be still tight. Once you pop it, then you can adjust it. Don't think the S cam is sticking in the bushing as it moves easily. Hope it is just a brake shoe/roller/spring/etc. Don't think it is the can? Don't see how that could be, but haven't pulled the pin out. Need to have a buddy stop over so I can crawl under and watch what is going on when the brakes release. Hard to be at two places at once? I try sometimes. Only bad thing, I have to have the truck OUTSIDE to get the axle out to get the drum off....UGH. Weather has already taken a turn for the worse so not sure when I'll get to it. Don't need the truck til next April, so it's not a big deal(yet). 1 of three things happening either that shoe is wearing out &s cam starting to travel to far or its just a lube prob. lube being the easiest to fix. or the return spring inside the service brake is weak or broken another thought if you have semi metalic brake lining they are most likely just sticking to the drums Edited November 12, 2018 by carlotpilot 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409316 Share on other sites More sharing options...
blackdog2 Posted November 12, 2018 Share Posted November 12, 2018 The old skid plate shoes no rollers ? Quote Ed Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409320 Share on other sites More sharing options...
MACKS Posted November 12, 2018 Share Posted November 12, 2018 25 minutes ago, blackdog2 said: The old skid plate shoes no rollers ? That's what I was thinking to,there a pain,try to spray a little lube on he s cam where it makes contact with the pad. Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409323 Share on other sites More sharing options...
Freightrain Posted November 13, 2018 Author Share Posted November 13, 2018 Remember this has a 1991 Ford frame in the back with Rockwell rear. I had it apart when I converted it back to spokes from Budds. It's been flawless, til now. Something needs attention, but it sucks it's winter and I have to work on it outside. Ugh. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409326 Share on other sites More sharing options...
blackdog2 Posted November 13, 2018 Share Posted November 13, 2018 brake pedal hanging up ? brake light still on ? Quote Ed Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409342 Share on other sites More sharing options...
davehummell Posted November 13, 2018 Share Posted November 13, 2018 try chocking the wheels and then releasing the brakes and get down and give the shoes a wack with a hammer you don't drive the truck everyday maybe the shoes are sticking a little. have you greased the fittings a lot on the s cam? you got air there pull the lines off the chamber and put the air to to it and see what happens. you should have q quick change shoes. Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409343 Share on other sites More sharing options...
Freightrain Posted November 13, 2018 Author Share Posted November 13, 2018 Haven't noticed brake lights on, this is typically just after releasing parking brake only. Not from using service brakes. Service works fine. I usually give the service brakes a quick hit and that usually unlocks the brake. Like I mentioned, this is something that just popped up suddenly. I can't get to the brake shoes due to dust covers in the way. Even if I could get the covers off, the Neway trailing arms are in the way big time and not sure I could even get myself or a tool in there enough to do anything. Thus I have to get truck out of the garage and remove axles and pull hubs to see what is going on. This was before changing the hub over to spokes: My garage space is too tight to allow getting the axles in while the truck is in the stall. Luckily I pulled the axle before I put the frame section on the truck. Once I had it on the ground with spokes on it, I rolled the truck out of the garage and slipped the axles in it. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409374 Share on other sites More sharing options...
Mike Posted November 13, 2018 Share Posted November 13, 2018 Hey Larry, You can move on down here to Nashville, everybody and their cousins are doing it. The land is cheap but the only problem is, is we don't know how to drive down here. LOL 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409379 Share on other sites More sharing options...
Hobert62 Posted November 13, 2018 Share Posted November 13, 2018 I'm gonna guess with worn lining and s-cams going a little to far. While using the foot brake and driving you have some vibrations and shaking to help keep thins free. When your parked in the parking brake and release it you need the little extra nudge to get them free. If it does it when parked for short times its not the lining rusting fast to the drum. I've had it do it over night but not likely any quicker. Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409381 Share on other sites More sharing options...
MHfred Posted November 14, 2018 Share Posted November 14, 2018 Is it temperature related? If so, set a heater in your garage and see what it does. Quote Link to comment https://www.bigmacktrucks.com/topic/54805-rear-brakes-seem-to-be-hanging-up/#findComment-409398 Share on other sites More sharing options...
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