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Front Disc Brake Tutorial

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Focker, Oct 9, 2015.

  1. Dec 10, 2017
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

    Tri-Cities WA
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    I actually never went through with it. :oops:
     
  2. Dec 10, 2017
    cj6/442

    cj6/442 Sponsor Sponsor

    Fallbrook, Calif
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    20171210_172313.jpg heres my setup jeep dana 30 with ford bronco outer axles and locking hubs and chevy backing plates and chevy /wilwood calipers
     
  3. Dec 21, 2017
    jim warren

    jim warren Member

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    Doing this modification on my sons 69 gladiator. Does anyone know if I need to remove the check valve in the front mc reservoir? The mc is for a 69 do I’m assuming I will have to.
     
  4. Dec 21, 2017
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

    Tri-Cities WA
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    Yes.

    I posted it so you can see how hard it was for me to remove. I ended up having to buy a new MC.
     
  5. Dec 21, 2017
    jim warren

    jim warren Member

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    I did some research after my initial post and found out that I will have to remove the check valve. I was advised that a MC from an early 70s ford f100 pickup with power brakes and front disc brakes will work without any modifications as it was designed for disc brakes. I will keep the forum updated as I proceed with the project
     
  6. Dec 23, 2017
    cj6/442

    cj6/442 Sponsor Sponsor

    Fallbrook, Calif
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    my lines were backwards ,,,,,,for about 20+ years ....
     
  7. Dec 30, 2017
    cj6/442

    cj6/442 Sponsor Sponsor

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    Mr. Focker ,,,,, did you use the same full drums master ? or get a disc/drum master ?
     
  8. Dec 30, 2017
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

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    I was going to use the original one until I ruined it trying to remove the valve. I ended up buying a new MC. I'll look at my records for the one I bought. I believe it's for a Ford?
     
  9. Dec 30, 2017
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

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    My complete parts list:

    The MC is not a direct bolt on...It required some minor modification to the Jeep's MC mounting setup.

    Master cylinder - '76 Ford Bronco disc/drum - Raybestos MC36399 1" bore
    Brake output fitting - Napa Part #:641-3305 (front) Thread Size: 3/8"-24 x 1/2"-20
    Brake output fitting - Napa Part #:641-3306 (rear) Thread Size: 3/8"-24 x 7/16"-24

    FRONT DISCS:
    Caliper mounting brackets - '76 Chevy K20.
    Caliper - '71-'78 Chevy K10 - Oreillys Part #: 18-4045 Right
    Caliper - '71-'78 Chevy K10 - Oreillys Part #: 18-4046 Left
    Organic pads - '71-'78 Chevy K10 - Oreillys Part #: LD52
    Rotors - '77-'80 Jeep CJ - Raybestos 3550R
    Brake hoses - Napa Part #: 36761
    Banjo bolts - Napa Part #: 82698
    10 qty lug studs Dorman - Part #: 610106
    12 qty Grade 5 - 1" fine 3/8"- 24 thread bolts and lock washers


    REAR DRUMS:
    Buy rear brake parts for a '71 Wagoneer...Use 1" bore wheel cylinders with 3/8-24 Thread Size.

    11" Drums Wagoneer Backing Plate Numbers:
    Bendix - 315688 Right
    Bendix - 315687 Left

    Napa:
    Drums - Part Number: ND 4401123
    Shoes - Part Number: TS TS10A
    Hardware set - Part Number: UP 2238
     
  10. Jan 3, 2018
    jim warren

    jim warren Member

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    The f100 MC was not even close. There was no hole in the plunger for the push rod. The boys at NAPA gave me a MC from a early 70's F250. Its pretty close but the stud spacing is 3 1/4 and mine is 3 3/8. Mr Focker, what did you have to modify on the Bronco MC? I hope than I'm not hijacking the thread by adding a booster to the discussion. I am on the fence about hogging out the stud holes an 1/16 on each side. However, all the other measurement are pretty darn close. I can always use the original equal sized reservoir from the Gladiator.
     
  11. Jan 3, 2018
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

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    I don't remember specifics, but I do remember some drilling to make the bolt holes line up and I cut the frame a bit and the pedal arm for clearance. It's mentioned in another thread. I'll look for it and move these posts there.
     
  12. Jan 3, 2018
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

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  13. Jan 28, 2018
    jim warren

    jim warren Member

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    We installed a MC from J and W. I looks identical to the one we had from NAPA from a 76 Bronco.They said it would fit the the booster they sold us years ago. After countless attempts at bleeding the system we occasionally lose the pedal .When the brakes work, the change in the way the truck stops is awesome. My son bench bled the MC and had a hard time getting it to pump up. I told him it was air bound. Can we have a bad MC ? This MC looked like it had fluid in it at one time. Ive replace numerous brake parts over the years and never had this happen. It just doesn't seems to get better after bleeding it. There are no leaks and the lines a hooked up properly
     
  14. Jan 28, 2018
    Focker

    Focker Ran when parked... Runs while moving. Staff Member Sponsor

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    I have no experience with boosters.

    Watch this.
     
  15. Feb 12, 2018
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    So, caliper mounting brackets... I am rebuilding a dana 30 and will be converting it to disks. Its got 10" drums now from a bait and switch from the PO. Which is fine.
    Question:: whats better, original jeep bracket or the Chevy? Is the answer ' the one you can find!' haha. Wasn't sure if one or the other has more accessible parts these days. Thank you!
     
    Last edited: Feb 12, 2018
  16. Feb 17, 2018
    jim warren

    jim warren Member

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    I know that this doesn’t directly affect CJs but we finally got to the bottom of the occasional soft peddle on the Gladiator. We found that when the wheels were turned hard left or right the banjo bolt on the caliper hit the shock causing the caliper to collapse. I had to cut the mounting tab off and weld a new one about an 1/2” inward. Actually my buddy who’s real welder did the welding. Hasn’t happened since. I know that this isn’t CJ related but it’s Jeep related.
     
  17. Feb 28, 2018
    sterlclan

    sterlclan Member Sponsor

    exploring the...
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    That sounds like my luck “didn’t see that coming”
     
  18. Mar 21, 2018
    Steve's 70-5

    Steve's 70-5 Member

    Louisville, Ky
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    Use the brakes lines listed from the parts needed. The lines on the passenger side are hitting the tire. Is there a shorter line?


    [​IMG]


    [​IMG]
     
  19. Mar 21, 2018
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
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    Could it be that the calipers are on the wrong side? It looks like the hose is on the top, the bleed screw should be facing up. Maybe a pic with the wheel removed.
     
  20. Mar 21, 2018
    45es

    45es Sponsor Sponsor

    Naches, WA
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    The caliper is on the correct side. On mine, I had to roll/rotate the brake hose to a slightly different position to address the same problem you are experiencing. There may be a different hose to use, but I don't know what it would be.
     
    Steve's 70-5 likes this.

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