1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Geo Tracker/Suzuki Sidekick Disc Brake Solution For Early CJ5's

Discussion in 'Early CJ5 and CJ6 Tech' started by tarry99, Mar 23, 2018.

  1. May 17, 2018
    tarry99

    tarry99 Member

    Northern California
    Joined:
    Oct 29, 2012
    Messages:
    3,784
    It's all about piston bore sizes in the calipers / wheel cylinders & fluid volume at both ends.......... Comparing master bore sizes vs caliper bores / wheel cylinders bores , pedal ratio & brake force torque needs is important information to stop a given weight while also giving some consideration to larger tires and auto transmissions.....

    A good brake system only becomes good when you spend the time to do the calculations............
     
  2. May 17, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    My 71 has a factory 1977 Dana 30 disk axle with the thick disks swapped in. I did this swap in late 2005.
     
    71CJ54WD likes this.
  3. May 17, 2018
    Daryl

    Daryl Sponsor

    Bonney Lake, WA
    Joined:
    May 25, 2006
    Messages:
    2,819
    And yet some how us rednecks have always figured out how to make a Jeep stop.:D
     
    tripilio, Muzikp, Bowbender and 4 others like this.
  4. May 17, 2018
    tarry99

    tarry99 Member

    Northern California
    Joined:
    Oct 29, 2012
    Messages:
    3,784
    That is amazing!
     
    tripilio likes this.
  5. May 17, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    Are you running a 2lb Wilwood residual valve on the front brakes or did you use something different?
     
  6. May 17, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    Yes! The Wilwood 2lb RPV.
     
  7. May 20, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    So here are my line from the master. I believe these are stock lines. Looks like rear port is going to rear brakes and front port to front brakes. Can anyone explain why the lines go to a block and then back to the rear axle? It doesn’t look like a proportioning valve. Just looks like both lines split at that block. I’ve also attached a picture of the service manual components.

    [​IMG]

    [​IMG]
     
  8. May 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    Flow divider, its to divide the oil flow equally from R to L side on the brakes. Also on the front to back.
     
    Last edited: May 21, 2018
    71CJ54WD likes this.
  9. May 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    When you hook this master cylinder up for disk brakes you will need the larger rear reservoir to run the disk front brakes. Otherwise it will not stop right. The disk take much more fluid than the drums so it needs the largest volume.
     
  10. May 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    Here is a picture of my setup. The 10lb (red) RPV is attached to the front well of the MC and runs to the rear drums. The blue 2lb goes to the rear well and to the front disk's.

    Sag-9.jpg
     
  11. May 21, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    Thanks all. The plan was the move the front to the rear port and move the rear brakes to the front port. I will add a 2lbs valve for the disks.

    In regard to part 2, the flow divider, could I remove that and replace it with a true disk/drum proportioning valve. Recently I swapped front disks and hydroboost brakes onto a 65 GMC. I installed a proportioning valve from a 2 door Tahoe from the 90s. This was to get the correct proportioning. Would this flow divider be set at 50/50? If so then it would seem I should swap in a disk/drum unit.
     
  12. May 21, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    The flow divider did not really do anything other than balance from right to left. I can't remember but I think my original setup had different sized brake lines to the front than to the rear and thats what acted like a proportioning valve. Buy setup hs no proportioning valve but we did install one on my buddy's cj6 setup.
     
  13. May 22, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    What is strange about the divider you can see in my pic (as opposed to the one closer to the front of the jeep that splits left to right) is that a line goes into it and then immediately toward the back of the jeep. I am confused what it is doing that requires 1 in and then immediately curves on back. Why isn't that line going from the master straight back to the rear? That is what makes me think its a proportioning valve inside.
     
  14. May 22, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    Well now we see why my lines were installed what would be considered backwards had my Jeep been supplied with a bigger front brake reservoir. Alas it was not. I have the older style 50/50 with bolt on lid. So I get to purchase a 71 master and likely flush some interesting material out of the remaining brake lines...

    [​IMG]
     
  15. May 22, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    Not necessarily, if it has the stepped piston it may still work fine. I would clean it out and hook it up the way I showed you. My reservoir is only minimally larger in the back but the rear stepped piston makes all the difference.

    Mine has the bolt on lid also!
     
    71CJ54WD likes this.
  16. May 22, 2018
    fesser

    fesser Napa, CA 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Napa, CA
    Joined:
    Oct 16, 2014
    Messages:
    547
    I may have missed it, but has anyone found a bolt in master cylinder that would be a good match to running 4 of these discs?
     
  17. May 22, 2018
    47v6

    47v6 junk wrecker! 2021 Sponsor 2020 Sponsor

    USA
    Joined:
    Oct 25, 2006
    Messages:
    5,285
    I really think that rear disks are over rated. If you have the 11" drums with the Ebrake stuff, its superior. The front disk setup on the rear gives no Ebrake option other than the d18 transfer case. you can try your hand at eldorado calipers but others have had issue.
     
    71CJ54WD likes this.
  18. May 22, 2018
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    6,168
    Subaru. :sneak:
     
  19. May 22, 2018
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,265
    With front disks and the rear 10" drums I can stop on a dime with a 1500lb trailer on the back. No real reason for rear disks.
     
    cookieman likes this.
  20. May 22, 2018
    71CJ54WD

    71CJ54WD Sponsor

    DC
    Joined:
    May 3, 2018
    Messages:
    326
    I'll give it a go - probably gonna take a lot of bleeding even after I wash out the reservoir because that gross stuff is probably in the lines too!
     
New Posts