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Calipers For 1.125" Disk Brakes

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Jw60, Jul 17, 2019.

  1. Jul 17, 2019
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    266
    I'm working on 4wheel disk brakes using the tutorial:
    Front Disc Brake Tutorial

    I have these:
    Caliper - '71-'78 Chevy K10 - Oreillys Part #: 18-4046 Left
    Caliper - '71-'78 Chevy K10 - Oreillys Part #: 18-4045 Right
    I am looking for the calipers to use on the rear or front to generate a little bias front to rear. I need to know if anyone is using any other calipers with a slightly smaller or larger piston on the gm brackets.
    All I can find are 75mm or 2.9" piston calipers.
    Thank you
     
  2. Jul 17, 2019
    Vanguard

    Vanguard Chief Cook and Bottlewasher Staff Member Sponsor

    Brighton, MI USA
    Joined:
    Aug 30, 2006
    Messages:
    1,580
    The normal way to do this is with a proportioning valve - usually embedded in the master cylinder. Wilwood or another aftermarket company may make an adjustable standalone valve. Otherwise, I would match a set components from the donor application to what fits your axles and wheels.

    When I upgraded to 11" drums, I matched all the components to a '73 or '74 CJ5 - so master cylinder, drums, shoes, wheel cylinders and hardware.
     
  3. Jul 17, 2019
    Jw60

    Jw60 Recovering Jeepaholic

    Sedalia MO.
    Joined:
    Oct 5, 2018
    Messages:
    266
    My idea was just to get a small bias with the caliper sizes and still us this wilwood valve to fine tune. My hard top is soo heavy it will throw off any fixed ratio, add the snow plow and it gets back out of whack.
    https://www.summitracing.com/parts/wil-260-8419/

    Most of what I've seen are 75mm k5 calipers on the front with 1.125 thick rotors and caddy or s10 calipers around 60mm on the rear with the 7/8" thick rotors. Then again bam bam is running the opposite with a proportioning valve without issue.
    I might be chasing my tail a little.
     
  4. Jul 22, 2019
    davet

    davet Member

    Andover, MN
    Joined:
    Jul 30, 2003
    Messages:
    162
    —I use same GM parts all around without any stopping issues but I’ve never had to emergency stop on the street.
    I have read somewhere about Suzuki Sidekick calipers being used for this because they’re lighter and smaller.
    Not sure about backing plates with those.
     

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