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Old 11-25-2013, 10:50 PM   #1
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Default 1997 C3500 Chevrolet Rear Drum Brake Issue

Replaced rear brake shoe at approximately 100,000miles due to wheel seal leak. Right rear brake drum temperature is running 100 to 120 degrees hotter than the left side drum. Temperature was measured with a infrared temperature guage at edge of the brake drum nearest the inside dual wheel. Brake linings were replaced about 1000 miles ago. Didn't notice the temperature issue until we were about 400 miles into our trip to N.C. when I could smell brake linings. From this point on I checked temperature with a frequency of 50 to 80 miles with the highest temperature being 235 degrees. Disassembled right rear today to check my work. All was okay. Primary and secondary shoes in proper locations. Wheel cyclinder pistons both were/are free moving, and shoes return to their at rest position against post. E brake cable is free and not handing up. Brake drums were not turned. Replaced brake hardware today with the off chance that they or some of the parts were not performing properly. Still have a temperature issue, but seems to have dropped slightly although my check has been done running empty and not while towing my fifth wheel trailer. Any suggestions as to what to look for or replace/repair. Could there some isssue with the brake lining. I decide to try brake shoes from Autozone since front pads stand up well. Didn't have this heat problem before my brake job to the best of my knowledge. Thanks inadvance for any information and help in resolving this issue.
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Old 11-26-2013, 07:24 AM   #2
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how are your axle bearing and seals? if you replace your hardware and make sure nothing is hanging in the wheel cylinder i cant think of anything else
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Old 11-26-2013, 07:55 AM   #3
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Check the fluid level of your diff. A hot hub can radiate the heat outward into the drum.
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Old 11-26-2013, 11:03 AM   #4
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The bearing show no signs of visible failure and feel smooth upon rotating then in their cup/race. I prelubed bearings upon assembly plus added what lube I could into the hub (about 1 to 2 tbsp.). Yes, some does run out of hub at the axle flange and complicates getting a good seal between flange hub, but eliminates having to grease bearings waiting for lube from differential. I also check and top off differential. I've never had a bearing fail and never have a issue with compatabilities between lube oil and grease. And yes the seals are new. I don't t believe I have ever reused an axle seal once I have removed a drum and hub assembly. To replace the seal each time is cheap insurance against leaking puberty to the brake linings. This heat difference between sides has me puzzled. I decided to try Autozone over NAPA to save roughly 50% on the shoes themselves. My gut is telling me that may have been a mistake. I don't know. Anyway, I want to thank you for the suggestions.
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Old 11-26-2013, 12:11 PM   #5
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The only two things I can think of is the adjuster being too far advanced causing the shoes to rub, or a bad bearing. Is there any play in the wheel with jacked up off the ground? Can you back the adjuster off until it is barely making contact when braking? The other thing you could try (on a temporary basis) is back the adjuster off so the shoes are not engaging at all (brakes only engaging on 3 wheels) and see if the drum is still heating up. That will tell you if the problem is with the shoes or not.
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Old 11-26-2013, 01:58 PM   #6
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There is little to no play with hub bearings, just as it was prior to disassembly, no heat problems at that time. Initially, I preset the shoes and adjusters inside the brake drum prior to installation. After finishing my brake job, I did several hard stops in reverse finish adjustment since I forgot to do it while jacked up. That appeared to take care of any adjustment issues at that time. No noticable oder of hot brakes (as l noticed on our trip), and brake travel was as before, and braking seemed better since there was no oil on the new linings. Of course, what else would expected. There has not been any visable smoke from the hot brake linings and no visable damage to linings when I had it apart yesterday. My truck rarely sees use during our winter months except to get fire wood which is probably why oil seals began to fail. Otherwise, I use it primarily to either tow my boat or fifth wheel trailers. I try to keep it off our salt laiden roads in winter. There has to be some simple answer which we are not coming up with. I worked at a NAPA Autoparts store in the early 70'* and I know there are different hardness of brake linings dependent on application of use, and that still exist today. I wonder if differentt lining hardness/quality could cause this temperature problem and if I have a mix of different brake linings. This could be a quality issue, just not sure. It'* almost as if the linings are expanding due to heat since all else appears to be working properly. When I dissembled the left side yesterday, I didn't have to back off the brake adjuster. Also, if I put the truck in neutral, it would roll downhill, forward or backwards. Truck would/will also coast to a stop at slow speeds without the feeling that the brakes were braking or dragging heavily.
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Old 11-26-2013, 02:02 PM   #7
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Can't really do anything today due to the weather. No garage or shelter.
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Old 11-26-2013, 02:37 PM   #8
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you take the adjusters off and make sure they turn well? i usually put some anti seize on them and make sure the part that activates them actually works and sometimes the teeth are wore out.
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Old 11-26-2013, 06:36 PM   #9
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Brake adjusters are fine. No rust or corrosion, no binding in the threads, and were lubed with anti-seize. Adjusters do adjust the brakes. Right rear has been both manually adjusted and automatically adjusted. Drum and hub can be removed without backing off adjuster and slight drag can be heard while rotating drum prior to removal.
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Old 11-30-2013, 10:52 AM   #10
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FYI, I changed the brake shoes yesterday with brake shoes from NAPA. The Autzone brakes showed uneven contact only on the primary lining. Contact was mainly on throw first inch on inside of the lining and about 1/2 inch on the outside edge of the lining leaving the center untouched. The secondary shoe showed contact on almost the whole lining. Drove about 20 miles. Heat issue so far appears to be resolved so far. We will be head towards home today and have about 700 miles to cover. I'll let everyone know if this does resolve my problem or not. I'm confident it will, but time will tell. I want thank everyone that offered their thoughts and ideas. Have a great day.
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