Master Cylinder upgrade

truedson87truedson87 Band Wagon
in Suspension, Braking & Wheels
Ive got a 91 RT and am looking to do a huge brake setup on it for future time attack events and so forth. I picked up some 05 Acura RL front calipers and am working on the rear setup but need to change it to disc brakes first. My real question is a master cylinder upgrade. Id like to go with a 1 inch bore but it seems difficult to find one that is a direct bolt on. I know about the 15/16" masters that can be used but I'm looking to go bigger in order to fill these massive calipers with enough fluid. Anyone have any suggestions?

Comments

  • DarrenDarren Wagonist
    5th gen accord?
  • LowFlyin'LowFlyin' Moderator
    '94+ Integra GSR. You'll have to move one brake line and you'll need the booster, too. I have one in my CRX.

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  • truedson87truedson87 Band Wagon
    is the booster a direct fit?
  • jt223539jt223539 New Wagonist
    If the booster turns out to be a direct fit, you can swap to a ITR 1" master cylinder with either a EK or ITR brake booster onto your car.
  • turbo_tegturbo_teg Council Member
    Do u keep the GSR booster or use an RS? I did an ABS reomoval on my teggy back in the day and i used the RS booster but cant remember why.....
  • LowFlyin'LowFlyin' Moderator
    You'd have to keep the GSR booster and it is a bolt-on with the exception of moving the brake line. It's bolt pattern on the MC is opposite of the ED/EE.

    ...and the GSR is a 1" 2-port MC already.

    EDIT - 12/16 -

    I do remember having to replace the fitting on the brake line that is moved with the fitting from the master cylinder. The ID is the same, but the OD is bigger.
  • 1988rt1988rt Senior Wagonist
    I just put a 2005 RSX Type S on my 88 rt and it works awesome :)
  • jt223539jt223539 New Wagonist
    LowFlyin' wrote:
    ...and the GSR is a 1" 2-port MC already.

    After reading this I did some checking, and apperently any Master Cylinder on any 98+ integra (Excluding the RS model) had a 1" bore.
  • LowFlyin'LowFlyin' Moderator
    I wouldn't lie to ya! :) ...and if I remember correctly, my MC is off a '95 GSR.

    Edited my post above, as I remembered I had to swap fittings on the line that was moved.
  • unlimited02unlimited02 Senior Wagonist
    i jsut picked up a 15/16 MC from a 88-89 prelude and it lines up with the break booster..
  • jt223539jt223539 New Wagonist
    LowFlyin' wrote:
    I wouldn't lie to ya! :) ...and if I remember correctly, my MC is off a '95 GSR.

    Edited my post above, as I remembered I had to swap fittings on the line that was moved.

    Haha nah man wasn't hinting at that at all. But found it interesting that a 98+ Type R MC is around 100ish, while a 98+ GSR MC (which is the same bore) is around 80ish.
    unlimited02 wrote:
    i jsut picked up a 15/16 MC from a 88-89 prelude and it lines up with the break booster..

    Yea I did this swap my self, since I was sticking with drums in the rear. The only "mod" I had to do was slightly re bend one of the brake lines, but nothing I couldnt do with my muskules.
  • SpeedLogicSpeedLogic New Wagonist
    Can someone go to Ebay and give me a link for what part I need to buy to upgrade to the 15"/16" Master Cylinder off a 1989 Accord Lxi. I tried myself but there are a bunch of different options and prices I didn't know what I need. I am trying to upgrade to the following:

    Slotted Rotors
    Upgraded Pads
    Braided Brake Lines (While we are at it, are the lines the same for all civic's?)
    and this 15"/16" MC

    Any opinions on this set-up would be great! My brakes are ready to go, I need this done this week! Thanks!
  • Mandalore88Mandalore88 Senior Wagonist
    SpeedLogic wrote:
    Can someone go to Ebay and give me a link for what part I need to buy to upgrade to the 15"/16" Master Cylinder off a 1989 Accord Lxi. I tried myself but there are a bunch of different options and prices I didn't know what I need. I am trying to upgrade to the following:

    Slotted Rotors
    Upgraded Pads
    Braided Brake Lines (While we are at it, are the lines the same for all civic's?)
    and this 15"/16" MC

    Any opinions on this set-up would be great! My brakes are ready to go, I need this done this week! Thanks!


    for the master cylinder, the 15/16 comes on many models. Preludes, accord LX-i and SE-i, 88-91 Civic EX, probably more.
    For the master cylinder I don't know if ebay is the best route if its a made in Taiwan type of deal.

    If you are just added slotted rotors and nice pads I don't think the 15/16 is absolutely necessary. If your MC is bad and you are replacing it anyway that's another story.

    For the stainless lines, Earls and Goodridge seem to be the most affordable brandnames. You can get them on Amazon.com or Summitracing.com. If I remember right, for a wagon with rear drums you would want to get ones for a Civic sedan 4 door. Some one with more experience can chime in on this, I just know they need to be the right length and not be for rear disc applications.
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