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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Power 4-wheel disc brakes on 1968 Mustang

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    7/10/2026 2:48 PM  #26

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,585

    Re: Power 4-wheel disc brakes on 1968 Mustang

    TKO, is that an S-10, Blazer, Jimmy, etc master cylinder?
    What years?

    A GM part number might be easier to cross reference.
    I thought GM p/n had 8 digits.

    Last edited by Nos681 (7/10/2026 2:56 PM)

     

    7/11/2026 5:07 AM  #27

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 8,007

    Re: Power 4-wheel disc brakes on 1968 Mustang

    I believe it is for the Blazer, etc.  Just Google "GM 390572" and you'll get a bunch of hits taking you to the part.

     

    7/11/2026 10:37 AM  #28

    GPatrick
    Senior 24-7 FYI Addict

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    Registered: 4/01/2013
    Posts: 1,150

    Re: Power 4-wheel disc brakes on 1968 Mustang

    This is the Raybestos part.  The RockAuto page has some good photos.  In particular pay attention to the mounting hole orientation and spacing. This is for the GM left hand drive vehicles and note that the outlets are on the engine side.
    =13pxhttps://www.rockauto.com/en/moreinfo.php?pk=369894&cc=1303850&pt=1836&jsn=17

    I have the right-hand drive version on my car with outlets towards the fender wall.  From several searches, this part does not seem to be readily available anymore but there may be some equivalents/cross references on Ebay.

    https://www.summitracing.com/parts/agb-mc390572?srsltid=AfmBOop_kUQ7gRfVoaSnzgbdJV31hiPPMmJO0n-a7OT_YhQ-OQHI4E4o

    A number of the Hydroboost kits use the right hand drive version - or at least they used to.  It works perfectly with a GM Astro Van Hydroboost and I have no idea it it will even mount to a Ford booster.

    The overall length is 6.75" from flange to tip.  Rock Auto had a clearance 3 years ago and I bought a spare just in case.



     

     

    7/11/2026 7:09 PM  #29

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,762

    Re: Power 4-wheel disc brakes on 1968 Mustang

    This would be a great opportunity for someone from MustangSteve company to offer some factual data.

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

    7/11/2026 8:03 PM  #30

    50vert
    Senior 24-7 FYI Addict

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    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,515

    Re: Power 4-wheel disc brakes on 1968 Mustang

    MS wrote:

    This would be a great opportunity for someone from MustangSteve company to offer some factual data.

    This doesn't happen often enough anymore.
     

    "Those telephone poles were like a picket fence"
     

     

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