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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » New Master cylinder

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    9/21/2022 5:18 PM  #1

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 477

    New Master cylinder

    As some of you saw my dilemma with my brakes dragging at the bash, i am trying to troubleshoot.the problem. I am leaning toward replacing the mc that came with the car with something from an explorer. Right now it has the corvette style mc with the prop valve i assume that came from CSRP kit that they sell. Everything I read about it says it has 1-1/8" bore. Question is, can i use an explorer mc with 1-1/16 bore and a built in prop valve and take out both the mc and the prop valve installed now?  Or what are the options for the master cylinder?
    I have Granada discs on the front and Crown Vic discs on the back.

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
     

    9/21/2022 6:21 PM  #2

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,050

    Re: New Master cylinder

    Sounds like the Explorer has disc/disc brakes.

    Were you able to determine if it was fronts, rears, or both dragging.

    I believe your existing master cylinder is opposite a Ford master cylinder.
    Front -front brakes
    Rear- rear brakes



     

     

    9/21/2022 6:46 PM  #3

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 477

    Re: New Master cylinder

    All four are dragging

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
       •Thread Starter
     

    9/21/2022 7:50 PM  #4

    mustangermike
    Administrator

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    From: Cleburne
    Registered: 4/13/2017
    Posts: 202

    Re: New Master cylinder

    I can't remember Alan if you had a booster or not.  If you do have a booster I'd suggest a 1" bore master cylinder.  If you're running manual brakes then stick to a 15/16" bore master cylinder.

    Owner of MustangSteve - 1967 Mustang Coupe 302, 2005 Mustang GT
     

    9/21/2022 7:54 PM  #5

    BillyC
    I FYI 24-7

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    From: Chesapeake, Va.
    Registered: 4/02/2013
    Posts: 965

    Re: New Master cylinder

    I’m not sure of bore size but I have power discs front and rear. I’m running a mc from a 2000 6 cylinder Mustang. 

    "anyone that stops learning is old, whether at twenty or eighty"Henry Ford
     

    9/21/2022 8:44 PM  #6

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 477

    Re: New Master cylinder

    Have a booster, am going to check the push rod to make sure it has not loosened and pushing on the MC all the time. I know it had clearance when i installed it, but anything can happen.
     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
       •Thread Starter
     

    9/22/2022 10:38 AM  #7

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,192

    Re: New Master cylinder

    I have a hydroboost system for my disc/disc setup.  I used a 95-97 Explorer MC, 1-1/16" Bore, Raybestos #MC390217. 
    Note that I have seen where a vacuum booster got stuck in the in the ‘brakes applied’ position. 

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    9/23/2022 10:20 AM  #8

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,458

    Re: New Master cylinder

    -FLASH-.......
    IF you have GM calipers more than likely you will need GM type MC to make them work right.
    I had /have GM calipers and used the Maverick MC and never was satisfied with the pedal nor the stopping power.
    (S-10 calipers...Ford Ranger discs...Cadillac brake lines...a real cluster F of stuff / Scarebird kit)
    Another web site  (HAMB) had a couple guys that told me the difference.
    It did require some mods to make it work right (made an adjustable push rod as other stuff) but I am happy with it now.
    Best solution.......use KH stuff (all FoMoCo stuff)...I believe MS has all the stuff!
    6sally6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/23/2022 3:03 PM  #9

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,725

    Re: New Master cylinder

    For power boosted disc drum use 1” master cylinder from 1970 Mustang power disc drum.
    For disc/disc use 2000 Mustang v6 non traction control 1” bore

    On both, the fitting nearest the firewall is the front brakes.

    Both have 1.0” distance from the bottom of the bore where the rod actuates it to the booster mounting surface.

    74 Maverick 15/16” bore manual disc/drum master cylinder works for manual disc/drum system.

    I would not recommend larger than 1” master cylinder bore in any scenario except maybe a properly functioning hydro boost or excessive leg effort and lower line pressures will result.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/23/2022 4:57 PM  #10

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 477

    Re: New Master cylinder

    Right now i have the Chevy Disc\Disc PV4 proportioning valve in the system
    ..https://www.ebay.com/itm/233692041843  mine is aluminum.

    I assume i will keep that with the new mc.

    Ports will be on the passenger side, opposite of what i have now but i can run new lines.
     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
       •Thread Starter
     

     

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