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Thread: Master cylinder replacement, 1987 m35a2c

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    Default Master cylinder replacement, 1987 m35a2c

    Hi.
    This is Bill in pa.
    Im finally replacing my master cylinder.
    As I said I have a 1987 M35A2C.
    Was a U.S.A.F. truck.
    Has duel air paks
    I ordered a new one based on what the truck is. Master Cylinder New.jpgMaster Cylinder New.jpgMaster Cylinder Old.jpg
    Master Cylinder Old.jpgThe one my wife is holding is the new one.
    The other is the one that's in there now.
    What do I need to order?
    Thanks for any help
    Last edited by gringeltaube; 10-19-2019 at 14:05. Reason: title, specified

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    Sergeant Major Nomad1's Avatar
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    I believe the part # is 5934071 maybe it was because you said dual air not dual circuit

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    4 Star General rustystud's Avatar
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    That new master cylinder you have there is not a "dual" master cylinder but a single one. A new "Dual" master cylinder will run you about $250.00 to $300.00 easy. That one you have is for all the single circuit brake systems used on all the Deuce's until the late 1980's "Air Force" dual brake circuit Deuce's came out.

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    Colonel davidb56's Avatar
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    I have the same year/model truck...I believe he needs a Raybestos MK 1624 master cylinder repair kit.

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    Thanks for the help.
    I completely explained to the guy what I have.
    1987 M35A2C.
    duel air paks U.S.A.F. truck.
    Thats what he sent.

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    Quote Originally Posted by rustystud View Post
    That new master cylinder you have there is not a "dual" master cylinder but a single one. A new "Dual" master cylinder will run you about $250.00 to $300.00 easy. That one you have is for all the single circuit brake systems used on all the Deuce's until the late 1980's "Air Force" dual brake circuit Deuce's came out.
    Rusty, I dunno, that is not a FE777 MC, the outlet(s) are on the side and not at the rear, (single line) like the others I have seen. Also lokoks like a plastic reservoir. Looks like two outlets. Where do those two lines go?
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    Super Moderator gringeltaube's Avatar
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    Quote Originally Posted by WillWagner View Post
    Rusty, I dunno, that is not a FE777 MC, the outlet(s) are on the side and not at the rear, ....
    Guess Rusty was referring to the new MC held in hands, not the one installed.
    Definitely not the correct replacement part.

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    4 Star General rustystud's Avatar
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    Quote Originally Posted by gringeltaube View Post
    Guess Rusty was referring to the new MC held in hands, not the one installed.
    Definitely not the correct replacement part.
    Yes.
    Though after looking at the picture again, it appears to have two ports. Confusing. Need some better pictures of the new unit. For sure it is not a M35A2 Dual master cylinder though.
    Last edited by rustystud; 10-20-2019 at 01:43.

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    Yeah, I was referring to the mounted pic. The replacement is the FE777 style. Sorry for the confusion.
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    4 Star General bigmike's Avatar
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    Sure looks like the one held in her hands is for the single circuit brake system. The old one still mounted to the truck is a dual circuit MC.
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