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 Something weird just happened as I was finishing rehabbing my front brake cylindersJump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
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56D500boy |
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Expert 5K+ Posts: 9902     Location: Lower Mainland BC | . Patient is a 56 Dodge D500 with the D500 spec 12" Chrysler Total Contact/Center Plain brakes. I just finished cleaning and reassembling and flushing and bleeding the left front wheel cylinders. I did struggle getting the return springs on the shoes and support plate but I did finally get them on. I was just checking/confirming that I had the shoes adjusted fully in before I put the drum on. I was moving the adjustment cam when "BANG!!". And the return spring, attached to the "Spring Link" went totally loose. Hmm....? It seems like the spring either broke or came loose between the two plates of the support plate. That ain't good. Ain't good at all. Even odder, I was working on the front rear shoe when the BANG happened. Now the front front shoe return spring (and spring link) is loose too    Edited by 56D500boy 2024-03-27 10:18 AM (TotalContactCenterPlaneBrakeCutAwayShowingSpringLink_1.jpg) Attachments ----------------  TotalContactCenterPlaneBrakeCutAwayShowingSpringLink_1.jpg (80KB - 14 downloads) | ||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | . Got both of the spring links out yesterday. They seem to be fine. I will clean then and re-install (I hope) and try again.  | ||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | . Okay. I understand how I need to position the link spring behind the pivot and adjusting cam. (Based on MTSC image I posted above). *HOWEVER*, I cannot figure out how to achieve that without removing something, i.e. one or more wheel cylinders and/or ???? I don't want to give up on these brakes but they are fighting me. Hard. I need Superman and/or somebody with experience who has done this before to school me on the hows.  ???? Edited by 56D500boy 2024-03-27 11:25 PM | ||
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| Powerflite |
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Expert 5K+ Posts: 9665  Location: So. Cal | |||
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| 22mafeja |
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Elite Veteran Posts: 653 Location: Finland | |||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | 22mafeja - 2024-03-28 12:01 AM Is there a possibility that the inner and outer half of the support plate are bent too far away from each other so the link and the shoe get stuck. That could explain why it "banged" when you worked with the opposite cam. I don`t have to ask if everything is properly lubricated.. Hmm..if you got the links out you should be able to get them back too.. Ralf: I will check the plate spacing but I think it is fine (not bent). Everything was lubricated (maybe too much??). Now that I can't get the links back in, I have to wonder how got them out. (???) In review: The front (left) brake was put back together with all springs and retainers properly in place. I was just confirming that I had both shoes adjusted fully in so I could slip the drum on when the BANG happened. That said, I did notice some kind of weirdness with the front rear spring link when I was re-installing the return spring. The link was pulling out too far it seemed. Little did I know what that meant. (BANG) I am going to remove one of the four hub bolts to see if that helps. The shoes are off so I might be able to push the wheel cylinder piston/rod back in enough to get some more clearance (Nathan's suggestion) If I have to do major "Surgery" on the support plates/platforms, I am done with these (Central Plane) front brakes and I will go to the Scarebird 57 Dodge brackets and Cordoba rotors that I investigated last year. I just want to drive my car.  | ||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | . In the end, I removed all four bolts holding the brake system to the hub. Then I separated the Center Plane brake shoe support from the backing plate and then the wheel cylinders from the support plate. That left me with just the support plate and the two spring links. I struggled with trying to wiggle a spring link back into position but no go. I got out the "Plan B" Scarebird disc brake bracket and calipers and tried them on the hub again. Maybe to threaten the Center Plane support to behave (??). I don't know. Not quite ready to move to Plan B, I had a better looking inside the Center Plane support and noticed how they had strategically placed bumps/divots/dimples to constrain the position of the spring link. Suddenly (Dun, DUN, DAH), the light bulb went on: "If I can just eliminate those constraint points, I might be more successful in getting the spring link back into place". (I thought ) So I took the support and the two spring links into the house and down to my basement disaster, er, I mean "shop" and turned over the support and drilled out the divots (3) for one of the spring links. After filling (and Dremelling) the burrs from the drilling, I started fiddling with the spring link, trying this way and that way and then the other way. I eventually succeeded and got the spring link back in place. I had to quit for "supper" (and the DVD "Air" about NIKE and the first Air Jordan show) but got back on it this AM. Drilled and filled the second set of divots from the back side and then started fiddling with the spring link again. Even knowing that I could get one in didn't really help. BUT eventually I got the second spring link back in. I think I got the link down by the non-adjusting cam end first and then (somehow) rotated and cajolled (sp) the adjusting cam end past the cam and then into position. It's magic. So I will put the Center Plane brake stuff back together tomorrow (busy today with family stuff). BUT Plan B is definitely still in the picture. Edited by 56D500boy 2024-03-31 2:07 PM (PlanBScarebirdFrontDiscsThreateningTheCenterPlaneBrakeSystem.jpg) (CenterPlaneSupportPlateShowingSpringLinkContraints.jpg) (CenterPlaneSupportPlateWithBothSpringLinks_OneInsideOneOnTop_BeforeDrilling2ndSetOfDivots.jpg) (CenterPlaneSupportPlateWithBothSpringLinks_BothInsideAfterDrillngAndFilingDivots.jpg) Attachments ---------------- PlanBScarebirdFrontDiscsThreateningTheCenterPlaneBrakeSystem.jpg (183KB - 12 downloads) CenterPlaneSupportPlateShowingSpringLinkContraints.jpg (236KB - 12 downloads) CenterPlaneSupportPlateWithBothSpringLinks_OneInsideOneOnTop_BeforeDrilling2ndSetOfDivots.jpg (176KB - 12 downloads) CenterPlaneSupportPlateWithBothSpringLinks_BothInsideAfterDrillngAndFilingDivots.jpg (191KB - 12 downloads) | ||
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| 22mafeja |
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Elite Veteran Posts: 653 Location: Finland | |||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | 22mafeja - 2024-04-01 12:50 AM I think the mission of the dimples was to keep the spring link in place when you remove the return spring..am I wrong? I agree. And probably something to do with the original assembly procedure when they sandwiched the components together. Now I think I might want to add a thin retrieval wire on the exposed "loop" in case I bump the link into the support when I add the shoes and the return spring. At least I got the links back into the support. Edited by 56D500boy 2024-04-01 10:01 AM | ||
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| 56D500boy |
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Expert 5K+ Posts: 9902 Location: Lower Mainland BC | . Didn't use a "retreival" wire but I did temporarily "lose" the forward spring link during one return spring failure. I was able to get the spring link back into place using 90 deg seal "pick" through the hole in the support under the upper wheel cylinder. Eventually got the return springs back on (Always a struggle for me - bent the "sturdy" awl that I had - went back to the small screwdriver that I had been using). I might have got it all done yesterday but just as I was doing the final adjustment with the brake drum on, I heard a mechanical "Plink" which meant that I would have to back off the adjustment and pull the brake drum off to find out what the issue was. Did that this AM and found nothing amiss. Took a photo for my records (below). Put the drum back on, adjusted the bearing pre-load again and adjusted the left front brake shoes (again). Fingers crossed. (Drove the car around the block - no drama except I need to adjust the right front brake (it is backed all the way off) Edited by 56D500boy 2024-04-02 3:38 PM (CenterPlaneSupportPlateWithBothSpringLinks_BothInsideFullyInstalled.jpg) Attachments ---------------- CenterPlaneSupportPlateWithBothSpringLinks_BothInsideFullyInstalled.jpg (134KB - 9 downloads) | ||
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