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  1. #26
    FEP Super Member gr79's Avatar
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    Default add 79

    Quote Originally Posted by gmatt View Post
    from the 1981 specifications booklet:
    T-bird, XR-7 3 way alum. 400psi/.43 slope
    F/Z (sedan) 2 way alum. 300psi/.43 slope
    F/Z (sta. wagon) 2 way alum. 400psi/.43 slope
    Mustang/capri 2.3L 2 way alum. 400psi/.28 slope
    Mustang/Capri 2 way alum. 300psi/.28 slope
    Granada/Cougar 2 way alum. 300psi/.43 slope
    Adding F/Z 1979 from 1979 Ford Shop Manual Chassis Volume. No engine apps were listed:
    F/Z sedan 2 way alum 300/.43 slope port primary 3/8 in/out, sec 7/16/out
    F/Z sta. wagon 2 way brass 400/.43 slope, port primary 3/8 in/out, sec 7/16 in 3/8 out

    Mustang is listed as Mustang II. 1979 manuals have one or the other listed.
    Chart for 1979 Brake Control valve usage has old versions of Lincoln and Tbird 70's.
    Certain Fox specs may not have made it in time for publishing 1979?
    No Capri listed so assuming data for Mustang II and Pinto Bobcat may not mean Fox.
    Anyway says 2 way brass 300/.28 slope primary 3/8 in/out, secondary 7/16 in 3/8 out.

  2. #27
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    Glad this thread is continuing to document more specs. Thanks all!
    '85 GT

  3. #28
    FEP Super Member gr79's Avatar
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    Default adding 1985

    Note: Back cover of 79 Helm Ford shop manual shows publishing date of September 1978.
    In the complete manual set, some other 1979 Mustang/Capri specific data missed the bus too.

    Really helps to see multi year part number and compare spec patterns to replace exact or interchange parts.

    From 1985 Car Shop Manual Part I of II, Vol.B Sept 1984 publishing.
    All car lines used 2 way aluminum housings. Ports are either 3/8 or 7/16 no metric ports.

    Brake Proportioning Valve split points and slope performance specs:
    Mustang/ Capri 2.3 manual= 400/.36
    Mustang/Capri all others= 300/.28
    LTD/Marquis sedan= 300/.36
    LTD/Marquis wagon= 400/.43, 300/.43
    Tbird/Cougar= 400/.43
    Mark VII/ Continental 4 wheel disc 300/.36
    Mustang SVO 4 wheel disc 200/.28

    Brake system pressure at bleeder ports=
    F- 1000 psi
    R- 500/600 psi
    Per shop manual under general brake service:
    Top part of 2 way control assy contains the Pressure Differential valve. Senses unbalanced F to R brake pressure.
    Bottom part contains proportioning valve that regulates rear brake pressure.
    Split point is where lower prop valve starts to reduce rear brake pressure.

  4. #29
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    Great info there gr79!
    '85 GT

  5. #30

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    Data below is from first page, and what stood out to me is most of these cars are in the 300psi split .28 slope range, with SVO 4-wheel-disc being 200psi (earlier) .28 slope, and the bigger/heavier cars 400psi (later) with .43 slope...

    '80 Mustang/Capri, Fairmont/Zephyr 3.3L, 4.2L, 2.3L Turbo = 300 psi / .28 slope
    '80 Mustang/Capri 2.3L = 400 psi / .28 slope
    '81 Mustang/Capri 2 way alum = 300 psi / .28 slope
    '84 to '86 SVO = 200 psi split / .28 slope
    '87 Mustang (All engines) = 300 psi split / .28 slope
    '87 to '93 Fox (Unknown Engine) = 300 psi split / .28 slope

    T-bird, XR-7 3 way alum = 400 psi / .43 slope
    F/Z (sedan) 2 way alum = 300 psi / .43 slope
    F/Z (sta. wagon) 2 way alum = 400 psi / .43 slope
    Mustang/capri 2.3L 2 way alum = 400 psi / .28 slope
    Mustang/Capri 2 way alum = 300 psi / .28 slope
    Granada/Cougar 2 way alum = 300 psi / .43 slope
    Last edited by OldFox; 06-12-2024 at 03:08 PM.

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