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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » 8.8 rear disc brake conversion

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    4/09/2017 12:24 PM  #1

    scott66
    FYI FORD Member

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    From: Florida
    Registered: 6/17/2013
    Posts: 15

    8.8 rear disc brake conversion

    I hope someone can give me some insight. I found a Craigslist post stating:
    " a rear disc brake conversion for a ford car or truck using 15" wheels ,if you have the same axle bearing bolt pattern as an 8.8 ford this will fit all brackets,cables,clamps,hoses,bolts and brake line for an easy install".  I think the 8.8 bolt pattern is the same, 5x4.5.
    I have a v8 66 coupe with factory rear end.  Will this "kit " work? I have 17" wheels and installed front power disc kit years ago.
    Thx in advance

    Parkinson's, it's not just for old folks
     

    4/09/2017 12:35 PM  #2

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,627

    Re: 8.8 rear disc brake conversion

    I'm not sure what they mean by "axle bearing bolt pattern", but I don't think it means wheel bolt pattern.  I would assume they are referring to the bolt pattern for the drum brake backing plate.  On 8" and 9" rears this is also where the axle bearing retainer bolts to the axle housing, but 8.8 rears use c-clips and consequently do not have axle bearing retainers. 

     

    4/09/2017 1:14 PM  #3

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,900

    Re: 8.8 rear disc brake conversion

    Be careful...
    I suspect they are referring to the axle housing to backing plate/caliper bracket bolt pattern.  Last year I bought a complete rear disc setup from Blue Oval Ent. that fits the "late 9" rearend.  I took a chance that it would bolt up to the Explorer 8.8 I have under the 66.  Well, the bolt pattern at the housing flange is the same but it's oriented about 90 degrees off of what the caliper brackets are designed for.  I was hoping it would be an easy way to get the Cobra type parking brake and can the Explorer expanding shoe P-brake setup....No joy! 

    Due to the horizontal orientation of the Exploder housing flange this setup puts the calipers were one would not be able to connect the parking brake or effectively bleed the rears. 

    AS for that bolting to your stock 8", small brg. rearend...I would seriously doubt it.

    If they give you an FRP part number I will check against what I have...might save you some grief and $$$.

    BB
     

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    4/09/2017 1:42 PM  #4

    scott66
    FYI FORD Member

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    From: Florida
    Registered: 6/17/2013
    Posts: 15

    Re: 8.8 rear disc brake conversion

    Thx guys for the responses....I'll check the PN and let you know

    Parkinson's, it's not just for old folks
       •Thread Starter
     

    4/09/2017 2:23 PM  #5

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,900

    Re: 8.8 rear disc brake conversion

    I just spoke with MS about what I have and he tells me they are Mustang 05 - 09 GT and Six brakes but the brackets are different.  I will look into making a set of brackets or buying a set from MS.  If the price is cheap enough you could probably buy the MS brackets and not have crazy money in the rear discs.  The good part about these is the P-brake actuation.  Easy to connect and works fine with the stock pull handle which the expanding shoe type will not.

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    4/09/2017 9:41 PM  #6

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,383

    Re: 8.8 rear disc brake conversion

    You CANNOT use 15" wheels with the 2005-2014 rear discs.  They require at least a 16".  My GT2008-RSM brackets will install those brakes on small bearing 8" or 9" rears.  The GT2008-RLG is for the large bearing 9".
    The gold 68 has those brakes on it.



    You CAN use a 15" wheel  with the 94-04 Cobra rear brakes.  Matching fronts in either case require 17".
     

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

    4/09/2017 10:19 PM  #7

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,627

    Re: 8.8 rear disc brake conversion

    The rears are only 11.65" in diameter.  Its those 13" pie plate fronts that don't fit.

     

    4/12/2017 1:14 AM  #8

    scott66
    FYI FORD Member

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    From: Florida
    Registered: 6/17/2013
    Posts: 15

    Re: 8.8 rear disc brake conversion

    So it looks like I can order the proper bracket set for a small bearing GT2008 RSM from MS. And with my 17" wheels, it should fit.  Does that sound accurate?

    While I'm at it, I oughta order MS modified brake pedal for my 66 a long with his boooster.  I installed a set from Master Power Brakes for the front a few years ago. While they perform as intended, I cannot get used to the long pedal travel, almost to the floor. I've bled them multiple times and checked each line independently and still no change.

    Parkinson's, it's not just for old folks
       •Thread Starter
     

     

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