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Feeling of “slack” at start of brake pedal travel

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  • #599803
    Gareth RandallGareth Randall
    Participant

      Ever since I got it 4 years ago, my 1993 Jeep Grand Cherokee 4.0L has had a feeling of “slack” at the start of the brake pedal travel – you have to press it down past the slack before you start feeling any resistance. I want to feel resistance as soon as I start pressing the pedal.

      It has new front calipers and hoses, rebuilt rear drums (including new cylinders), and has been thoroughly bled. None of that has made any difference to that annoying bit of slop at the start of the pedal travel. It doesn’t affect actual braking performance, it’s purely a “feel” thing.

      Would I be right in thinking that if I’m able to push the brake pedal a certain distance before I feel any resistance, it’s probably something to do with the booster and/or master cylinder, given that the pedal acts directly on the booster which acts directly on the cylinder?

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    • #599944
      Rob megeeRob megee
      Participant

        It is possible that the rear drum brakes are not adjusted correctly. If they are too loose the shoe will need to travel too far before making contact with the drum.

        Bleeding issues will usually be a spongy pedal but can also cause excessive pedal travel. If the Master cylinder fluid level got too low during bleeding you may need to do a bench bleed.

        #599948
        Lorrin BarthLorrin Barth
        Participant

          I was just looking at the service manual for my car. There is a check and adjustment for pedal height, pedal clearance from the floor and free play. All stuff I’m supposed to be checking at service intervals but never do.

          #600087
          EricTheCarGuy 1EricTheCarGuy
          Keymaster

            Before you try and adjust the pushrod, attempt a rear brake adjustment first. If you adjust the pushrod and later do rear shoes, they may lock up if they were not adjusted properly when you did the pushrod adjustment. More info here.

            http://www.ericthecarguy.com/faq/solving-brake-problems

            keep us posted.

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