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| Why do I always have problems with drums . . . https://www.slantsix.org/forum/viewtopic.php?t=48524 |
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| Author: | D-Ram 1596 [ Fri Apr 13, 2012 5:02 pm ] |
| Post subject: | Why do I always have problems with drums . . . |
I figure there is enough people on here with more experience then me that can help me out why I am still having drum problems. I have a jeep cherokee and a D-150 that I have rebuilt all four brakes on each one in the past year. The D-150 always gave me issues with vibrations, even after getting the drums turned, but its my beater vehicle so I didn't look into it. The Jeep started giving me some bad vibrations from the rear under heavy braking about a month ago. I took the drums in turned, there was a flat spot in the one, put it back together and they are still giving me a massage when braking. Could the shops brake lathe be slightly out of round, are my axles goofy, I can't really figure it out. Both had new pads and wheel cylinders put in when I first replaced the brakes. |
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| Author: | WagonsRcool [ Fri Apr 13, 2012 8:19 pm ] |
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I'll assume that your trucks have front disc brakes. What makes you think that rear drums are causing your brake pulse? While I often see (minor) out of round conditions on drums, most pulse concerns usually stem from thickness variations on disc rotors- which is caused in turn by rortor runout or warpage. Pulse can show up on braking as: steering wheel shimmy/shake; brake pedal "jerking"; whole car "jerking" (the full body massage); or any combination. Bent rear axles can cause problems, but drums have to be pretty bad before they have the same affect as a bad rotor. |
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| Author: | KBB_of_TMC [ Mon Apr 16, 2012 9:27 am ] |
| Post subject: | |
I've seen drums that would gradually go out of round with use, but eventually relax back into round; very strange, but I ended up alternating between 2 sets roughly 1-2/year as a cheap workaround. I've never had to replace the drums on my '85 Cherokee, just the rotors after they got chewed up by a frozen caliper. The replacements were cheap Chinese and rusted like crazy, but seem to work OK. |
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| Author: | D-Ram 1596 [ Wed Apr 18, 2012 9:25 pm ] |
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I haven't driven the truck in a couple months since it is 2wd and it wouldn't make it during the winter months with all the hills and snow, so it may have gotten better. KBB: you may be right about the drums braking in though, the last few times they have been a little better. The dana 35 axle isn't really a "tank", and the u-joints are most likely original so it could be a few things. |
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