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02-20-2023, 07:14 PM | #1 |
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39 rear brakes dilemma
I am rebuilding the brakes on my 39 Deluxe Fordor. I bought Raybestos replacement shoes and cannot get the brake drums back on. I thought it might be some differences in the shoes, so I put the originals back on and have the same problem, but not as severe.
There are four adjustment points on each wheel and I have adjusted them to what I think is the adjustment that is backed off the maximum adjustment, if that characterization makes sense. I have clearly done something wrong or don't understand the positioning of the shoes in order to get the drums back on. What is the secret formula or what have I done wrong? It all looks fine and conforms to the photos I have and the drawing in the shop manual. At the top of the shoes, the parking brake mechanism seems like it puts limitations on how much you can back off the adjustment. I watched a Youtube of someone installing brakes like mine. I struggled to get the cross arm for the parking brake on. He had no difficulty installing it, so maybe that is my issue. I don't see any other way to put it together. Any ideas?
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1924 Model T Coupe 1928 Model A Roadster 1930 Model A Town Sedan 1939 Deluxe Fordor 1945 pickup 1951 Custom convertible Last edited by mhsprecher; 02-20-2023 at 07:20 PM. |
02-20-2023, 07:22 PM | #2 |
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Re: 39 rear brakes dilemma
Have you backed off the parking brake adjustment—- perhaps disconnect it
Have the shoes been fitted to the size of the drum? |
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02-20-2023, 08:33 PM | #3 |
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Re: 39 rear brakes dilemma
Yes and yes.
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02-20-2023, 08:54 PM | #4 |
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Re: 39 rear brakes dilemma
The bottom adjustment helps center the shoe on the backing plate. When you hold the drum up to the shoes take a look and see what direction the shoes need to go, and adjust the bottom to make that happen. The top adjustment moves the shoes apart or in, you need to start with them fully in.
This is assuming stock 39 backing plates, not post-war or Lincoln or something else. |
02-20-2023, 09:01 PM | #5 | |
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Re: 39 rear brakes dilemma
Quote:
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1924 Model T Coupe 1928 Model A Roadster 1930 Model A Town Sedan 1939 Deluxe Fordor 1945 pickup 1951 Custom convertible |
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02-20-2023, 09:05 PM | #6 |
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Re: 39 rear brakes dilemma
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02-20-2023, 09:06 PM | #7 | |
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Re: 39 rear brakes dilemma
Quote:
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02-20-2023, 09:11 PM | #8 |
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Re: 39 rear brakes dilemma
Yes to all of the above. There is a drawing in the shop manual that is better. I can take a pic of mine and post it, plus the diagram from the shop manual.
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02-20-2023, 09:13 PM | #9 |
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Re: 39 rear brakes dilemma
38 Coupe: yes to your questions. I will take a pic of my brakes and post it. I probably can't get to it until Weds.
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02-20-2023, 09:32 PM | #10 |
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Re: 39 rear brakes dilemma
Here are pics of my brakes as I disassembled them. Hope they help
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02-20-2023, 09:41 PM | #11 |
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Re: 39 rear brakes dilemma
On the lower adjuster make sure the dots are facing one another. That’s the high point on the adjustment cam. Brings the shoes all the way in.
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02-21-2023, 05:54 AM | #12 |
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Re: 39 rear brakes dilemma
Is you wheel cyl seized, or possibly expanded a little during the install? The wheel cyl should collapse and give you the clearance. In one picture it looks like its stuck out a little .
Are your shoe tabs aligned with the piston slots ? Last edited by Ggmac; 02-21-2023 at 07:07 AM. |
02-21-2023, 09:08 AM | #13 |
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Re: 39 rear brakes dilemma
"IF" it is any help to you, sometimes a picture is worth 1000 words. My 39 Mercury
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02-21-2023, 09:19 AM | #14 |
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Re: 39 rear brakes dilemma
This might help or not. I believe it was from a posting either here on the Barn or the HAMB.
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02-21-2023, 10:44 AM | #15 |
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Re: 39 rear brakes dilemma
When installing the shoe return spring make sure it is installed in a way so it does not touch any of the linkage. If the ends of the spring are under any of the linkage it will bind the shoe operation.
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02-21-2023, 04:57 PM | #16 |
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Re: 39 rear brakes dilemma
I rebuilt the wheel cylinders as a part of this project.
I will check and make sure the dots on the adjusters are closest to one another. I think I did that, but will check again. I think the return springs are installed properly, but I will check again.
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02-21-2023, 07:32 PM | #17 |
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Re: 39 rear brakes dilemma
If you are still having problems, you could start by fitting just the shoes, like on a front brake setup. If they fit ok, then try with the emergency brake parts also fitted. If the shoes alone do not go on you can at least limit the investigation to the shoes.
If the shoes alone go on ok, and it's not ok with the emergency brake parts fitted then that will tell you where to look. I would leave the cables unattached for the initial investigation of the emergency brake parts. It's just a step by step sanity check approach. Mart. |
02-22-2023, 08:09 AM | #18 |
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Re: 39 rear brakes dilemma
Thanks for all the suggestions.
I took a pic of my setup last night and looking at it and some of the comments, I am thinking that the parking brake cable is the culprit. I will move the parking brake lever out, which should bring the rear shoe in. I am hoping that is the problem. I have the parking brake fully released, but it may not be enough to get the drum on.
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02-22-2023, 09:58 AM | #19 | |
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Re: 39 rear brakes dilemma
Quote:
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02-22-2023, 10:24 AM | #20 |
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Re: 39 rear brakes dilemma
"Maybe its me BUT the shoes at the top at the wheel cylinder seem a little too far out compared to my photo. ALSO did you compare your old shoes in this area to the new ones??? IF Memory serves me right, the new shoes have a slightly longer tang for the wheel cylinder cup than your old ones????"
I compared the new and the old shoes. They look pretty similar, but I will check again when I take the brake apart again. Your point about the shoes being farther out at the top is probably due to the parking brake. I will check that out today and see what that does.
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02-22-2023, 10:33 AM | #21 |
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Re: 39 rear brakes dilemma
You could check the E-Brake lever real quick, just disconnect the cable and leave it, push the lever in and try the drum and see IF it fits.
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02-22-2023, 10:48 AM | #22 |
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Re: 39 rear brakes dilemma
It looks like the parking brake is applied. Compare the picture of your brake with the picture of Rockfla's in post #13, the lever is much more forward on your brakes than on his. You can also see that the spring on the emergency brake cable is almost fully compressed on your brakes.
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02-22-2023, 11:12 AM | #23 | |
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Re: 39 rear brakes dilemma
Quote:
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02-22-2023, 12:27 PM | #24 |
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Re: 39 rear brakes dilemma
The wire going from the center of the car out to the backing plates "should" have a "little" slack in it. IF Its banjo tight...BINGO!!!!
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02-22-2023, 02:14 PM | #25 |
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Re: 39 rear brakes dilemma
The vertical handbrake arm in its relaxed position should be back against the shoe ,Back of the hand brake cable at the gear box , Ted
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02-22-2023, 04:45 PM | #26 |
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Re: 39 rear brakes dilemma
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I figured it was something simple or something stupid I had done. It helps to get other eyes on a problem.
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02-23-2023, 04:18 AM | #27 |
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Re: 39 rear brakes dilemma
The cable would have been adjusted to suit the wear on the old shoes. It is often the case that it needs readjusting (slackening off) after fitting new shoes.
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02-23-2023, 08:54 AM | #28 |
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Re: 39 rear brakes dilemma
Agreed, but I am surprised it was off as much as it was as the old shoes (shown in pic) were not that worn. In any event, an easy, if embarrassing, fix.
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02-23-2023, 12:50 PM | #29 |
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Re: 39 rear brakes dilemma
On a positive note, that means you kept your E brake properly adjusted !
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02-23-2023, 03:04 PM | #30 |
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Re: 39 rear brakes dilemma
Well, that is true! Hard to believe that they weren't too tight, but I have not driven the car much in the last few years. I am redoing the wheel cylinders, master cylinders and will replace the shoes if need be. I am finishing up the rears. The fronts are next, now that I have this "duh" problem figured out.
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02-27-2023, 02:00 PM | #31 |
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Re: 39 rear brakes dilemma
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