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MC for disc brakes!

Discussion in 'Flat Fender Tech' started by Vhunter, May 22, 2007.

  1. May 22, 2007
    Vhunter

    Vhunter Member

    Redding, California
    Joined:
    Jun 26, 2005
    Messages:
    262
    I have a Chevy dual master cylinder were the brakes share the same reservoir as the clutch in my CJ2A. I want to put Disc brakes on my CJ2A and was wondering if I could still use this set-up. Is anyone using this MC with discs and is it working well. I noticed that Willysworker has this set-up and he has disc brakes, but have not heard back from him on how his setup is working. Does anyone else have any experience with this setup?
     
    Vhunter, May 22, 2007
    #1
  2. May 22, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    5,471
    Willysworker and I both have the AA swinging pedals setup and thier master cyl. He and I are both running Disc on the front - mine is a D30 that I just installed. My only issue is some brake drag. AA says the MC does not support DISC, but, I believe that would be for a larger setup.
     
    Warloch, May 22, 2007
    #2
  3. May 22, 2007
    Vhunter

    Vhunter Member

    Redding, California
    Joined:
    Jun 26, 2005
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    262
    That is the setup I am using, the AA swinging pedals. So, what do you mean by a larger setup. I plan on using the chevy parts on my dana 30 for the disc brakes with the thick CJ rotors and 11 inch brakes in the rear. So, other than the discs dragging, does it work fine? I saw in one of my old Rod&custom magazines where this guy ran 4 wheel discs with this MC. I want to stay with these pedals as I don't want to have to fab a new pedal setup.
     
    Vhunter, May 22, 2007
    #3
  4. May 22, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    5,471
    Larger - something that uses larger caliper setups - more pistons. I am also running 11" rear drums, my D30 is just the stock thinner Disc setup, but I don't think it would cause an issue. Right now my clutch works fine and my brake pedal is solid.
     
    Warloch, May 22, 2007
    #4
  5. May 22, 2007
    Vhunter

    Vhunter Member

    Redding, California
    Joined:
    Jun 26, 2005
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    262
    So, one last question. Does it stop good and are you happy?
     
    Vhunter, May 22, 2007
    #5
  6. May 22, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    No road time yet, but I can tell a diff just pushing it around and loading it off and on a trailer. Once I get the SM465 to use the forward gears I'll let you know :)
     
    Warloch, May 22, 2007
    #6
  7. May 23, 2007
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
    Joined:
    Aug 7, 2003
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    4,538
    Find out from AA if their MC has a pressure residual valve and if it does is it a
    2lb or 10lb. 2 lb residual valves are for discs, 10lb are for drums. If it has the 10lb you'll need to remove it and instal an inline 2lb valve for the front discs and a 10lb inline for the rears. They can be had from Summit Racing and elswhere. I'm using the AA pedals but I wanted the safety of a dual MC, so I'm using a Wilwood dual res. MC for the brakes. It bolted up just fine to the AA pedal set. If you leave the 10lb valve in the discs will drag, you'll get crappy mileage and your discs will wear out fast.
     
    Posimoto, May 23, 2007
    #7
  8. May 23, 2007
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    Shouldn't have any valve in them as the valve is only for a MC below brake level (per my understanding on the reading I have done). This is to prevent leak back into the MC.
     
    Warloch, May 23, 2007
    #8
  9. May 23, 2007
    junkfood

    junkfood Member

    Casa Grande,Az.
    Joined:
    Oct 23, 2005
    Messages:
    222
    Well yes and no.. As I understand it, it is also used to keep pressure on the drum brake shoes to keep them extended so they don't completely retract. That keeps the shoes close to the drum as they wear.
    Keith
     
    junkfood, May 23, 2007
    #9
  10. May 24, 2007
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    Apr 17, 2006
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    Drums always have 10 lb. valves. Discs only need 2 lb. valves if the M/C is below the calipers. If it is on the firewall no valves needed for discs.
     
    mortten, May 24, 2007
    #10
  11. May 24, 2007
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
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    4,275
    This is technically correct, but most disc MCs that I have come across DO have the 2# RPV in the port for the front brakes.
     
    w3srl, May 24, 2007
    #11
  12. May 28, 2007
    4dawudz

    4dawudz Dale

    ADK NORTHERN New...
    Joined:
    Nov 25, 2006
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    166
    If I'm reading this right, the MC is a single piston for the clutch and another for the brakes using a common res. (I think I have seen these) but the brake does NOT have a dual piston??? If so, I would make very sure my E brake works well, as if you pop a brake line you lose ALL brakes and your stopping power becomes... E brake and/or killing the engine in gear (go ahead, ask me how I know)!

    My setup was two single masters on a swing system from Ansen, I think Mr. Gasket owns them now and I don't know if that setup is still offered, but anyway, as soon as I had my "incident" I modified the swing pedal arrangement to a dual brake master. I drive much more relaxed now! Think about it !?! Thank you very much.

    Dale
     
    4dawudz, May 28, 2007
    #12
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