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Rear Disc Brake Conversion With Parking Brake

Discussion in 'Builds and Fabricators Forum' started by FinoCJ, Oct 21, 2022.

  1. Oct 21, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Doing some prelim research on disc brake conversion for the 58....I am mostly looking at the traditional GM conversion that would be similar to the 'kits' from the standard suppliers (KW, Herm, Horsepower etc). As many of you know, there are some nice threads on various forums for individual parts and numbers etc if you want to piece it together yourself (including Fockers thread in our tech index and Nick's thread on the cj2a page etc). As I understand, the parts for the front D25 are the same as would be used for the tapered D44 rear in terms of the caliper bracket, calipers and disc to be fitted to wheel hub.

    BUT, here is the question: How are people handling the OEM rear wheel mounted parking brake as found on some non-CJ willys? I see that Herm and KW (who basically sell Herms kit as I understand) have an option for a rear kit with parking brake. It seems there a small secondary cable operated caliper that is needed - which would then need to be mounted to the caliper bracket? Anyone have information on this piece? Herm calls it 'special,' but is it just a GM piece that can be ordered? I assume it would follow in the mold of most of these parts and be a 70s era GM parking brake caliper for a K1500 or whatever?
    From Herm:
    #41 and #44 centered or offset taper or flange rear disc brake kit with E-brake — $800.00 (Includes same parts as normal rear disc kit, with Special E-brake calipers) This does not include E-brake cables.
     
    Last edited: Oct 21, 2022
  2. Oct 21, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Probably using Cadillac or Camaro rear calipers depending on what rotor, etc. he is using. Just a guess though.
     
  3. Oct 21, 2022
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    Brennans EEE parking brake is your best option for rear disc brakes. Mine hasn't let me down yet and it holds really well.
     
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  4. Oct 21, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    I am definitely interested in the electric brake he has, but this whole discussion on his webpage confused me more than helped...mostly it wasn't clear if you had to use his tracker/sidekick style brackets and calipers or if they would work with GM parts. Not sure how much mixing and matching could be done....as he says, its still in beta testing and not all the kinks have been worked out.
    https://brennans-garage.com/products/electric-emergency-brake-eebrake-rear-bracket-kit-41-75-jeep
     
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  5. Oct 21, 2022
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    Yes, those are the correct brackets. Then you need to find the calipers and use Samurai discs.

    Here they are on my jeep with a flanged D44.

    http://www.earlycj5.com/xf_cj5/index.php?threads/107180/page-8
     
  6. Oct 21, 2022
    supertrooper

    supertrooper Member

    moreno valley, ca
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    I have been running that electric parking brake setup for awhile and it works great. I'm controlling it with the wilwood controller kit. Basically you buy brennons brackets and find calipers and rotors from the list of compatible models he lists. I got my calipers from ebay for $60 each. Rockauto had the best price on new rotors, i think around $40 for the pair. The brackets came with several spacers to center the caliper over the rotor but i didn't need the spacers.
     
  7. Oct 21, 2022
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    Do you have the link to the wilwood controller kit?
     
  8. Oct 21, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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  9. Oct 21, 2022
    garage gnome

    garage gnome ECJ5 welder

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    It isn't.
     
  10. Oct 21, 2022
    Jw60

    Jw60 Cool school 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    The "big" k10 Chevy calipers don't have a parking brake equivalent that would fit on the same bracket that I am aware of.
    If i recall correctly The smaller front s10 bracket works the same with Cadillac Eldorado rear calipers. Our 2019 Expedition has e-parking brake calipers but I don't have it home to measure. We have the in-laws 2013 right now and I'll have to look at it's set-up. You could do a transfer case disk parking brake like duffer or his modified parking brake calipers that use the same rotor as the "big" chevy calipers but are seperate calipers from the service brakes.
     
  11. Oct 21, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    just to ask - what or how did they do a parking brake on those GM trucks?

    As in they also do not have a parking brake option? I have a friend with a YJ with a weird D44 rear axle swap and Eldorado brake calipers etc - have an inquiry in with him to ask about his parking brake set-up.

    Besides that such modding/fabbing is probably a bit over my head, I would need to swap out the rear D18 cap to one that is compatible with the parking brake - My 58 came with rear wheel drum parking brakes. Not totally out of the question, but certainly hoping not to go that route.
     
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  12. Oct 21, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    There are two different sizes of Cadillac ElDorado calipers with park brake. The 1980 that were the “large” Cadillac calipers that worked with the 1 1/4” thick rotors. Very commonly used with Jeep and Scout thick rotors and GM 1 1/4” rotors used on 14 bolt rear axle disc conversion. Then There are the later Cadillac calipers that work with the Jeep, Suzuki, etc. thin rotors. For awhile the larger calipers were no longer available but they are being made again.
     
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  13. Oct 21, 2022
    Jw60

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    The trucks are front calipers used on the rear for swaps. that Era still had drum rears. The YJ might have an explorer 8.8 with disks from the factory.
     
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  14. Oct 22, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

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    ahh yes....forgot about that....so back to the original question....what is Herm using for a cable actuated rear disk parking brake and how is he mounting it to the bracket?

    no...its a cut-down 44 with some sort of Eldorado caliper conversion....not sure what he uses for discs or parking brake....
     
  15. Oct 22, 2022
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I’m going to be putting together a rear disc brake setup on my Jeep this winter. I’ll be utilizing Richard from R&P’s 1/4 ton brake kit with s10 calipers and vented rotors. The e brake will use Willwood mechanical spot calipers and my current cable actuation park brake brake lever.
    I’d be willing to bet that a stock cable park brake handle and cables could be adapted to work with what I’m putting together.
     
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  16. Oct 22, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

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    those are nice (albeit pricey) - speedway has some cheaper generic ones I was looking at - but still no clue how you would mount them. Fabbing up some sort of addition to the existing caliper bracket? I should give Richard a call - I discussed quite a bit of this stuff with him a couple years ago when I bought his MC bracket and willwood MC but didn't want to dive into the full conversion at the time. Although his mounting bracket works fine, I've been a bit disappointed in the willwood MC more than anything - stupid plasticky leaky thing.
     
  17. Oct 22, 2022
    Rozcoking23

    Rozcoking23 RUN & GET BIT! 2024 Sponsor

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  18. Oct 22, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

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    Looks like Jeepsterman uses a single caliper that has a mechanical connection for the e-brake cable....
    Rear disc brake kit for the early Dana 44 with 2 piece tapered axle. Brake kit includes: CNC cut brackets, fasteners, short cable extension (connects park brake cable), stainless brake lines, and new 11 9/16″ vented rotors & New (not rebuilt) Calipers with a parking brake.
    [​IMG]
     
  19. Oct 22, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

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    that kit is for the 30 spline D44 - slightly different bolt pattern than the earlier tapered 44....would work on my cj though....his kits also use a large diameter rotor and have clearance issues with 15" wheels - even the aftermarket ones (mostly on the front).
    Trying to stay away from the kits due to price and source the GM parts individually to save a decent sum....just can't figure out the rear parking brake.
     
  20. Oct 22, 2022
    Rozcoking23

    Rozcoking23 RUN & GET BIT! 2024 Sponsor

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    It uses the Eldorado calipers with e-brake. Also came with the smaller gm rotors. You can piece this all together with a little google search. The brackets are the most important piece to get this to work. I looked at a lot of brackets but didn’t want the weld on brackets.
     
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