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    Light shudder on braking.

    Team,

    I have a light shudder/roughness on braking moderately hard. Here is all i know:

    SYMTOMS:
    - Light braking = No Probs
    - Moderate braking = light shudder

    CHECKS SO FAR:
    I assume this is a front brake problem so have done these checks:
    - Front pads: Tons of thickness. 1/2" at least
    - Rotors:
    - No shiny spots I can see. Sandpapered them anyway
    - thickness = about 1.1" both rotors
    - thickness variation = +/- 0.004" (same L and R rotors, measured in 5 places on each rotor)
    - rotor warp: can't see any. Rotate each disk by hand. Gap under pads remains constant and absolutely tiny.

    Any ideas what to test next?

    Car:
    - '86 Town Car, 302 EFI

    Rob The Aussie
    Rob the Aussie
    Photos
    Founding (and only) member of the CLIPPer Club.
    (Continuous Lincoln ImProvement Program).

    Car: '86 Lincoln Town Car
    Engine: 302 Windsor

    #2
    Could be worn steering/suspension components if it's not the rotors.
    Builder/Owner of Badass Panther Wagons

    Busy maintaining a fleet of Fords

    Comment


      #3
      Sounds an awful lot like rotors, but possibly out of round brake drums. I'd have the rotors turned and see if that doesn't fix it. Nobody turns those drums so thats a possibility too. If you can find a brake shop with a lathe to do rotors and drums, have them both turned.
      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

      Comment


        #4
        Sounds Exactly like a Problem I have had a few times in the past. Make sure your Lug Nuts are tight and check the tie rod end's. Once they start getting sloppy, you'll get a slight vibration out of them.
        Other then that, One of your rotor's may be slightly heat warped.


        293 RWHP & 312 RWTQ
        Many Bolt-ons and Dyno Tuning

        Comment


          #5
          Tires could be flat spotted. Mine are and it shudders but thats my own fault.
          1989 Grand Marquis LS
          flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mph

          Comment


            #6
            Update:

            Did all of the following and the problem reduced 90% (ie .. MUCH better now). I have no idea which thing below fixed the problem.
            • sandpapered front rotors
            • removed both back drums, shook out all brake material dust, adjusted shoes out a small amount (maybe one or two turns on the adjusting wheel)




            Rob The Aussie
            Rob the Aussie
            Photos
            Founding (and only) member of the CLIPPer Club.
            (Continuous Lincoln ImProvement Program).

            Car: '86 Lincoln Town Car
            Engine: 302 Windsor

            Comment


              #7
              More to this theme:

              - I also have a gigglyness (That is an Australian technical term that roughly translated to gigglyness) when not braking - just going along a flat road at 35 mph. Like any roughness in the road causes more vibration than it should.

              So .. I am guessing front shocks. (rear ones are 2 months old)

              Any advise on how to check shocks (never done it before).

              The old lean-on-the-hood-and-watch-it-rise-up-once test seems to pass OK.

              Rob The Aussie
              Rob the Aussie
              Photos
              Founding (and only) member of the CLIPPer Club.
              (Continuous Lincoln ImProvement Program).

              Car: '86 Lincoln Town Car
              Engine: 302 Windsor

              Comment


                #8
                check for fluid leaking onto the shock body, that's a definate sign.
                Builder/Owner of Badass Panther Wagons

                Busy maintaining a fleet of Fords

                Comment


                  #9
                  alot of the time... a pulse felt when braking is a result of warped rotors. If you don't want to drop the $$ for a new set, find a shop with a lathe and take a light cut.
                  1987 LTD CROWN VICTORIA, 5.0 EFI, MAGNAFLOW DUAL EXH, RED LANDAU
                  FRESH AOD, 3.27 OPEN DIFF, 57K MILES, B&M SHIFT KIT AND R134A A/C


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