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Shuddering on braking - is it suspension?

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    #1

    Shuddering on braking - is it suspension?

    This has got me beat.

    Braking has always been a little rough since I have had the car ('86 TownCar).

    Front (Disks):
    - New pads L & R
    - Both rotors turned last week (absolutely no change!)

    Rear (Drums):
    - New shoes L & R

    Nothing let to change!

    So .. got me wondering - maybe is something in the suspension?? Or the brake assembly ??

    What do you experts reckon??
    Last edited by RobClark; 08-18-2007, 08:00 AM. Reason: more info
    Rob the Aussie
    Photos
    Founding (and only) member of the CLIPPer Club.
    (Continuous Lincoln ImProvement Program).

    Car: '86 Lincoln Town Car
    Engine: 302 Windsor
    Tags: None
    #2
    Did you turn the rear drums? They get pretty bad some times.

    Comment

      #3
      Yeah, rear brakes usually have a lot to do with making the whole car shake, if they are out of round.
      1983 Grand Marquis 2Dr Sedan "Mercules"
      Tremec TKO conversion, hydraulic clutch, HURST equipped!

      Comment

        #4
        Check your tie rod ends, pitman arm and idler arm. A caliper hanging can cause problems also.

        Comment

          #5
          Oh! I was under the impression that drums never go out of round.

          Guess I was wrong! How common is this?

          Meanwhile - Will rip them off and have 'em done.

          Thanks

          Rob
          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

            #6
            There are tons of causes on a car as old as ours.

            The drums, tie rods, and other worn steering parts can cause it.
            Builder/Owner of Badass Panther Wagons

            Busy maintaining a fleet of Fords

            Comment

              #7
              if your parking brake works, lightly apply it while coasting at like 40 mph......if you feel the shaking, the rear drums are warped.....make sure to keep one hand on the release lever lol

              1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
              2006 Lincoln Town Car Signature. Stock for now
              1989 Ford F-250 4x4 much much more to come, sefi converted so far.
              1986 Toyota pickup with LSC wheels and 225/60/16 tires.
              2008 Hyundai Elantra future Revcon toad
              1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

              please be patient, rebuilding an empire!

              Comment

                #8
                :stupid:
                2008 Mercury Grand Marquis GS Bone Stock

                The modern definition of "racist" is "someone who is arguing with a Liberal".--updated Peter Brimelow quote.

                Comment

                  #9
                  The Handbrake test was definitive! Yep - same 'shudder'.

                  So ... will focus on the drums (shoes are new) when I get time.

                  Should I go straight for sending them to a shop to be machined - or some other plan B?
                  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

                    #10
                    I'd try having them machined first. They should be able to check to see if they're in tolerance enough to be machined. It will most certainly be cheaper than replacement drums, especially for you considering the shipping. If they can't machine them true again, I guess you're stuck buying new drums.
                    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

                      #11
                      machine to is 10.060" for 10" drums or 11.090" for 11" drums

                      1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
                      2006 Lincoln Town Car Signature. Stock for now
                      1989 Ford F-250 4x4 much much more to come, sefi converted so far.
                      1986 Toyota pickup with LSC wheels and 225/60/16 tires.
                      2008 Hyundai Elantra future Revcon toad
                      1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

                      please be patient, rebuilding an empire!

                      Comment

                        #12
                        Could be tires too. Real worn out tires will give a vibration while braking.

                        Comment

                          #13
                          i think that's before brakeing...
                          '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
                          '95 Ford Bronco XL -

                          sigpic :rebel:

                          Comment

                            #14
                            tires will just shake and shimmy, it won't show up only with the emergency brake like he's describing. Thats an out of round drum symptom.
                            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

                              #15
                              Oh ok I see.

                              Comment

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