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Rear Disc Brake Conversion.

Discussion in 'Early CJ5 and CJ6 Tech' started by scott milliner, Feb 5, 2017.

  1. Feb 12, 2017
    Long&Low

    Long&Low Active Member

    Geauga County, OH
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    I have Jeep rotors and chevy S10 calipers on my Warn FF kit; but no provision for an E-brake.
     
  2. Feb 14, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    Hub where done today free of charge for the machining. Brakes installed. Still need the Locking Hubs.

    [​IMG]
    [​IMG]
     
    Posimoto likes this.
  3. Feb 15, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    I shimmed the calipers to center them on the rotor. Then I made new brake lines and bled the brakes. I'm still waiting on the new locking hubs. They should be here today.
    [​IMG]
    [​IMG]
     
  4. Feb 20, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    New Warn hubs Arrived.
    [​IMG]

    I was bleeding the brakes today. I'm still fighting air in the lines. I gave up tonight. Going to retry again tomorrow.
     
    Last edited: Mar 9, 2017
  5. Feb 20, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member 2019 Sponsor

    Tri-Cities WA
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    Those Warn hubs are beautiful.

    I despise bleeding brakes.
     
  6. Feb 20, 2017
    jzeber

    jzeber Well-Known Member 2019 Sponsor

    Morgan Hill, Ca
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    I had air in my front brakes for what seemed like forever. A member gave me a person to call. He told me to take off the calipers, place a piece of wood between the brake pads (width of rotor). Hold the calipers as high as possible and bleed normally. I finally was able to get the air out with this method.
     
  7. Feb 21, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    Still fighting air in the system. Bleed, Bleed, Bleed. Oh. Done leave the cove off the master cylinder. Brake fluid will be on the garage ceiling.
     
    jpflat2a likes this.
  8. Feb 21, 2017
    wheelie

    wheelie beeg dummy 2019 Sponsor

    York, PA
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    How about one of those nifty one man vacuum pump brake bleeder things? Rubber hose hooks to the bleeder and you squeeze it/pump it and it pulls fluid through from the master cylinder.
     
  9. Feb 22, 2017
    mortten

    mortten I can’t put my finger on it

    Peninsula, Ohio
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    I have a vacuum bleeder that uses air pressure to create the vacuum. It works but still doesn't get a problem line bleed well. I replaced all of the lines on my 1997 K1500 with stainless steel. Had a hard time getting it bled through the ABS.
     
  10. Feb 22, 2017
    Norcal69

    Norcal69 Out of the box thinker 2020 Sponsor 2019 Sponsor

    Northern California
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    One thing to remember is that if you try to bleed too rapidly, you will aerate the brake fluid. It takes some time for the tiny air bubbles to work their way to one air mass that you can bleed out.
     
  11. Feb 22, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    I've bled the brakes for three days now. There is no air in the lines. I tried reverse bleeding, not luck. My pedal still goes almost to the floor before having a rock hard pedal. Going to try a Disc to Disc Master cylinder. I found out the Disc/ Drum master cylinder has a 1' to a larger rear bore. The disc to disc has a 1" bore both sides. If anyone has any thoughts on this please let me know.
     
  12. Feb 23, 2017
    47v6

    47v6 junk wrecker! 2020 Sponsor

    Washington DC.
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    I doubt you have air in your system. I had a very similar problem when I first did my own rear disk conversion. What It came down to was the caliper was not exactly centered on the rotor. I tried shimming and all manner of fixes. Nothing worked until I installed my own FF setup and used the exact same chevy parts I used to convert the drum D30 up front. I also went power brakes and my issues went away. What happened was the caliper was pushing the pad into the disk, but the other pad wasn't really close enough to give good braking action. I fought that for a year.
     
  13. Feb 23, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member 2019 Sponsor

    Tri-Cities WA
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    Are you using residual pressure valves front/rear?
     
  14. Feb 23, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    No. I installed a combination valve for 4 wheel disc. This doesn't have any residual pressure valuing in it. I also found out that the master cylinder for the disc/drum set up has a step bore. 1" for the disc/front. 1 1/8" for the rear drums. This means the rear gets more volume. (locking up first.) I need a master cylinder for disc/disc. The disc/disc master cylinder is a 1" bore front and rear.

    While taking off the calipers on the front. (To straiten out the braded brake lines. Maybe get the air out of the lines.) I noticed I have a front brake caliper that is stuck. I can not compress the piston. I'll need to replace it.
     
  15. Mar 2, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    I installed the new Master Cylinder and still had problems. I was fighting a low pedal until I found this video. I had air in the Master Cylinder.

    Now the brakes work great. The proportioning of the brakes front to rear is perfect.

    New master.
    [​IMG]

    New Disc to Disc. Combo Valve.
    [​IMG]
     
  16. Mar 2, 2017
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member 2019 Sponsor

    Tri-Cities WA
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    Great news and video.
     
  17. Mar 3, 2017
    Renegade ll

    Renegade ll Member

    Thayne Wyoming
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    Good to know.
     
  18. Mar 3, 2017
    wheelie

    wheelie beeg dummy 2019 Sponsor

    York, PA
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    That's very interesting and great info. Thanks Scott. Glad you got your brakes tuned up and working.
     
  19. Mar 9, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    Dec 17, 2002
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    I bought brake cables from Lokar. I wanted to have the cables come up though the floor below the parking brake. This wasn't possible because of the overdrive on the transfer case. I ended up running the cables through the back floor to the brake handle.
    [​IMG]
    [​IMG]
    To attach to my brake handle. I had to use a pulley.
    [​IMG]
    [​IMG]
    Now I only need the adapter for my brake adjuster. Should be here tonight.
     
  20. Mar 9, 2017
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
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    Parking Brake is all done. Works great.
    [​IMG]
     

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