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1986 MGM 5.0.......opinion needed

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    1986 MGM 5.0.......opinion needed

    When I replace the rear shoes should I just re-build the wheel cylinders, or just put in brand new units?

    Additionally, if it is found that the rear cylinders are dry and not leaking, should I just leave them be, or rebuild/replace?

    #2
    May depend how long they have been in there. If a "long" time (which you need to determine the definition of) I would replace them as they are cheap enough. As long as you don't screw up the brake lines (possible if they are very old) "no harm, no foul".
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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      #3
      Originally posted by friskyfrankie View Post
      May depend how long they have been in there. If a "long" time (which you need to determine the definition of) I would replace them as they are cheap enough. As long as you don't screw up the brake lines (possible if they are very old) "no harm, no foul".
      Yes!........two weeks ago I had to replace the rear drivers side brake line........rotted out with numerous tiny holes;-(

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        #4
        at a minimum peel back the dust boots and check for wetness and verify both pistons move freely. If it moves properly and isn't leaking, leave it be but don't be too surprised if they need to be replaced. Could always order them and the hardware just to have on hand. Only need what you don't have.
        86 Lincoln Town Car (Galactica).
        5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

        91 Lincoln Mark VII LSC grandpa spec white and cranberry

        1984 Lincoln Continental TurboDiesel - rolls coal

        Originally posted by phayzer5
        I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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          #5
          Do check all of the other hardware especially the rubber (or whatever they may be using) brake hoses. They may "look" fine but deteriorate from the inside by clogging up (like a person's artery and stop brake fluid from traveling to the brake and back).
          What I Own: 1993 Mercury Grand Marquis GS
          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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            #6
            Originally posted by gadget73 View Post
            at a minimum peel back the dust boots and check for wetness and verify both pistons move freely. If it moves properly and isn't leaking, leave it be but don't be too surprised if they need to be replaced. Could always order them and the hardware just to have on hand. Only need what you don't have.
            This would be what I will most likely do, as long as I am in there replace everything. Rock Auto is cheap enough!

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              #7
              Replace them. I left the ones on a 1992 C1500 when I did the rear brakes because they seemed OK when I peeled back the skirts. A few weeks later one piston seized up after a hard stop, taking the backing plate out with it. Your results may vary.
              1985 LTD Crown Victoria - SOLD
              1988 Town Car Signature - Current Party Barge

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