Next solution: Call Doctordiff.com and get rear discs. Front discs too while you're at it. Stopping and parts availability will be far better than what you have.
Hmm, then upgraded wheels and tires, then...
Lou
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| HOT rear passenger drum, others warm. https://www.slantsix.org/forum/viewtopic.php?t=68367 |
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| Author: | jayman62 [ Fri Sep 26, 2025 11:19 am ] |
| Post subject: | HOT rear passenger drum, others warm. |
Hello, I’d like to preface this by saying I have researched this here and other places before asking a question. I have a 1966 Dart GT (with a 225). I changed to a dual master cylinder a while back. All hard lines and soft lines have been replaced, all new brake components all around, all 4 wheels, and they are 9” drums all around. I am having an issue with my rear passenger side drum brake gets very hot compared to the other brakes. I have tried every trick I can think of to remedy, including that sides wheel bearing, loosening the parking brake cable, backed off the adjustment wheel, have changed springs, drum, wheel cylinder. Tested brake pedal is returning when pressed. I also know the brake releases, with the car stationary and wheel off the ground. I have a Raybestos MC36221 master cylinder, 1 inch bore As stated all new Inline Tube hard lines front to back. Inline tubes distribution block BLK243 for dual conversion and new dist, block in the rear, the one mounted on the axle. It would seem I have some hydraulic issue where the brake pads do not release, spinning the tire with the wheel off the ground I don’t hear any noticeable rubbing or locking. It’s fine the first 20 minutes of driving, However, when I drive a while longer, braking begin to fade, and sometime will lock up with normal braking, forget panic stopping if I jam the brakes it starts skidding. I would welcome any suggestions. I’m leaning master cylinder, should I use a different one? I even did a YouTube video on this problem to document everything I have tried for reference. Thank you. |
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| Author: | Dart270 [ Fri Sep 26, 2025 12:26 pm ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Personally, I would remove all of the parking brake mechanisms before going further. I see you replaced that wheel's wheel cylinder, which could have been dragging/ratcheting due to internal rust. If the hardline is partially plugged going to that wheel, that might also do it. I would probably replace that hardline before anything else. I have a coffee can full of new or good 9" drum parts that you can have for shipping, if you want it. I don't recall all that is in there, but there are front wheel bearings, some hardware, wheel cyls and rebuild kits. I can look this weekend. Lou |
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| Author: | jayman62 [ Fri Sep 26, 2025 12:35 pm ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Lou, Thanks for replying. Yes I did replace that wheel cylinder even though it was new itself when I did all the brakes, the hard line is brand new so I don't suspect a clog. I was entertaining taking the parking brake components out temporarily, maybe I will try that. Thank you for your offer of parts, really nice of you, I have a good set of spares parts, but appreciate the offer. Jay |
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| Author: | Dart270 [ Sat Sep 27, 2025 4:10 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
I've mostly had stock brake hoses collapse and "ratchet" hydraulically, so those are what I check/replace first, but the hardline could do it too. Might be a defective "new" wheel cylinder is my next guess after you rule out parking brake. I'm really looking to give away or throw out these parts (although no big hurry), so let me know... Lou |
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| Author: | SlantSixDan [ Sat Sep 27, 2025 11:31 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Now more than ever, new parts are not necessarily good parts. Replacement parts quality is in the toilet even for recent-model cars, and much worse for older models. |
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| Author: | jayman62 [ Mon Sep 29, 2025 9:02 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Issue resolved for now. Dan, Yes the parts quality issue is ever present. Lou, Following your advice I removed the parking brake actuator from the shoe and push the cable through the backing plate and tied up temporarily. After putting everything back together and adjusting I went for a spirited ride, testing all types of stops from normal, to down hill, to panic and I have good news to report. All the braking tests came back positive. It is so nice to not having to worry about having to make panic stops. I'll still keep my spidey sense going to anticipate stopping but I'm not worried I cant make a stop in time. Surprised how a good working 9" brake system actually can provide decent stopping. I'll have to next diagnose what's going on with that e-break lever connected to the shoe. It's ironic now because as I was restoring the brakes that rear passenger wheel was missing that e-brake actuator, I had to find one from a member here. Maybe it's not the right lever?? Thanks for the suggestion, and private message me I might take those 9 inch parts from you if it don't cost an arm and a leg for shipping. Jay |
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| Author: | Dart270 [ Mon Sep 29, 2025 2:00 pm ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Sounds good! The p brake cable can be slightly to very rusted inside and it will ratchet when you apply brakes successively. Way worse in rusty climates, but I bet can happen anywhere. You could try replacing that side p brake cable (from body to the backing plate). Bet that will fix it. Personally, I just tend to run with no p brakes on my cars, but I cannot legally recommend that to anyone else! Lou |
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| Author: | Bruce Pine [ Wed Oct 01, 2025 2:46 pm ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Lou, I am ready to go over my 62 Lancer 9" rear brakes and would gladly pay for your "coffee can" of 9" brake parts. All of my old my spares burned up in the Camp fire. Also ready to replace the leaking single exhaust system with Jared's Dutra Duals. Thanks for the help. |
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| Author: | Dart270 [ Thu Oct 02, 2025 3:15 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Hi Bruce! I'll look at what I have first and then let you know about shipping. I still think about how awful that fire must have been, from many perspectives. I hope you and Wendy are doing OK these days. Best, Lou |
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| Author: | MDchanic [ Sat Oct 18, 2025 2:09 pm ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Quote:
The p brake cable can be slightly to very rusted inside and it will ratchet when you apply brakes successively.
I know I'm late to this discussion, but to add a data point, I have twice had it happen that a frozen parking brake cable seemed to operate normally (apply brake, wheel locks, release brake, wheel turns), but, upon removing the cable from the car, it was completely stuck, or very very tight. (I had it happen twice because I'm a dodo and completely forgot about the first time when I was doing another car a few years later, so replicated my original error of not simply ordering brand-new, CHEAP cables). That cable should slide smoothly and easily. If it's even a little tight, replace them both. And since the parking brake "spreader" on that side isn't the original, make sure to hold it up against the one from the other side and make sure they're exactly the same. Good luck! - Eric |
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| Author: | jayman62 [ Fri Oct 24, 2025 7:19 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Thanks Eric for the insight, I replaced all the parking brake components. Well my issue has reared its ugly head again, I don't think it truely went away, but it is much better without the parking brake actuator. I'm thinking now I may have an issue with the backing plate. Perhaps it is bent or distorted? I'm going to see if I can find one and give that a go. I've replaced everything else anyway, includin the axel bearing. I'm really at my wits end. I'm sure now I do hear some rubbing back there but it is ever so slight, and that wheel still gets hotter than the rest. It's starting to make a little sence now, that same passenger rear wheel was missing brake components when I was restoring the car. All others had old, but complete components. That wheel was missing the parking brake lever and the top strut. The strut is still installed by the way. Perhaps that's why it ended up in a barn for 25 years. Jay |
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| Author: | Dart270 [ Sat Oct 25, 2025 9:08 am ] |
| Post subject: | Re: HOT rear passenger drum, others warm. |
Next solution: Call Doctordiff.com and get rear discs. Front discs too while you're at it. Stopping and parts availability will be far better than what you have. Hmm, then upgraded wheels and tires, then... Lou |
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