| Author | Message | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 386 Registered: 9-2006 Posted From: 209.156.24.114  Rating: N/A |
I want to rebuild the front brake cans on my 4104. The makings on them are TYPE 24 and a BW in a diamond. Do you think NAPA would have the rebuild kits for them?  | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 676 Registered: 3-2007 Posted From: 71.53.153.91  Rating: N/A |
Austin I think that you may go to a truck parts and buy a new or rebuilt can for a lot less than you can buy the kit for. I found that happens a lot of times. It is a borg warner chamber I think and it a standard chamber. Gomer | ||
| John Wolfe (John_wolfe)
Registered Member Username: John_wolfe Post Number: 7 Registered: 1-2007 Posted From: 75.68.182.122 Rating: N/A |
The front chamber replacement is GM # 2394054 which is the same as Bendix Westinghouse #229321. US Coach Repair in NJ (Luke) or a local truck parts place can help you. I agree that a new chamber is the way to go. | ||
| Ralph Peters (Ralph7)
Registered Member Username: Ralph7 Post Number: 78 Registered: 3-2004 Posted From: 75.209.50.207 Rating: N/A |
Big truck store may have or can order, 24 are not popular, all you need do is cut pushrod to correct (close) length. To do so run the jam nut close to the can,then pull or add air to old can and measure the length, do same to new can, use a hack saw. Be sure to remove the clevis first. If your present cans are not rusty, or leaking, I would not do anything with them. The diaphram is cheap, but can be a bear to get to seal. Liquid soap and luck. Again if the base of the can is not cracked, rusted through, leaking????? | ||
| Jim Shepherd (Rv_safetyman)
Registered Member Username: Rv_safetyman Post Number: 290 Registered: 1-2004 Posted From: 67.142.130.24 Rating: N/A |
Every time this comes up, I mention that we used to make air brake diaphragms and had a very large test lab. Most of the testing was done with the actual cans working against each other with a shuttle valve. We had several can failures from fatigue. One let go just as one of my technicians was walking by. Darn near got him. Just makes good sense to replace the unit and they are pretty cheap. Jim | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 387 Registered: 9-2006 Posted From: 209.156.24.114 Rating: N/A |
Ok, Replace the complete can. I have a Truck Pro here in Memphis that I'll call and see if they have them.... thanks everyone... . | ||
| macgyver (91flyer)
Registered Member Username: 91flyer Post Number: 550 Registered: 11-2004 Posted From: 74.193.188.165  Rating: N/A |
Anyone ever seen a spring brake literally explode? I was driving up to a construction area when a dump truck was pulling into the roadway one time and it was fully loaded... One of the two cans on the back end exploded and sent pieces flying about 200 ft or so behind the truck... Luckily, he was just pulling into the roadway and it failed before he was fully on the road... I was far enough back that I wasn't in danger, and the pieces flew into a nearby construction area without injuries... The sound was pretty deafening... Even at the distance I was at. And I'm mostly deaf to begin with. Hate to know what it sounded like to someone with good hearing! It was enough of a pulse to feel it deep inside your chest... Definitely not something I'd want to be next to. -Mac | ||
| Dallas Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 10 Registered: 7-2004 Posted From: 75.88.10.199 Rating: N/A |
Except..... These aren't the Spring brakes. They are the same as the service brakes on the front axle. It takes about 15 or 20 minutes to change a diaphragm. No heavy spring inside to cause an injury or death. Jim... What was the MTBF on those brakes you tested with the shuttle valve? I always have a couple of extra diaphragms with me, it's a whole lot easier to change one than to sit on the side of the road waiting for a part. (Message edited by Dallas on November 16, 2009) | ||
| Don Evans (Doninwa)
Registered Member Username: Doninwa Post Number: 238 Registered: 1-2007 Posted From: 208.81.157.234  Rating: N/A |
Everyone needs a nice new shiny part or two now and then. Gives you that warm fuzzy feeling to think you treated the old girl to some sparkle. Get the new ones and keep one of the old cans as a spare. Take the other can apart for kicks to see how good/bad it really is and post the pixs. If it looks good, change the diaphragm and carry it as the spare. All warm and fuzzy again. Good luck Don 4107 | ||
| macgyver (91flyer)
Registered Member Username: 91flyer Post Number: 551 Registered: 11-2004 Posted From: 74.193.188.165 Rating: N/A |
Please forgive me... I wasn't trying to imply that they were... I was just sharing a story about a worn out brake part since it was mentioned that fatigue caused a failure under controlled conditions... I simply wouldn't want to be within proximity of one when it failed!  -Mac | ||
| Dallas Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 11 Registered: 7-2004 Posted From: 75.88.10.199 Rating: N/A |
Sorry Mac, Mine came out wrong... sometimes they just don't come out right no matter how you type them. | ||
| Jim Shepherd (Rv_safetyman)
Registered Member Username: Rv_safetyman Post Number: 291 Registered: 1-2004 Posted From: 67.142.130.33 Rating: N/A |
Dallas, the MTBF was indeed a huge number of cycles. In addition, they saw full pressure as opposed to our mostly partial pressure applications. We did not do a statistical study on the failures. The failures were just considered a part of the testing and they were not the part being evaluated. As soon as our tech was exposed to what could have been a pretty bad accident, we started replacing the cans at a fairly low number of test diaphragms, as I recall. The cans were in a lab environment as opposed to the sometimes terrible conditions these things see on the road. I have seen some pretty badly corroded cans in the truck wrecking yards. That could certainly contribute to a failure. I guess my point (and Mac's) is that they do fail and the failure can be catastrophic. If you blow the can, you will most likely loose all the brakes on that tank (hopefully just one axle). Having said that, replacing the diaphragm as a temp fix is probably OK. Given the cost and safety implications, I replaced the whole unit (including the spring cans) on my bus. Jim | ||
| Austin Scott Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 388 Registered: 9-2006 Posted From: 209.156.24.114 Rating: N/A |
Well, Truck Pro has 4 on the shelf and 45 at the warehouse. $30.09 each was the price he quoted me. Now I need to find the time to go pick them up. . | ||
| Bruce Henderson (Oonrahnjay)
Registered Member Username: Oonrahnjay Post Number: 481 Registered: 8-2004 Posted From: 70.60.107.113  Rating: N/A |
Jim Shepherd said: "Given the cost and safety implications, I replaced the whole unit (including the spring cans) on my bus." Yup, I found some rust and I'm in the middle of doing the same thing now. I don't short cut on brakes. |