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Thread: Automotive Booster rod measuring tool

  1. #1
    Supporting Member
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    Mar 2012
    Ontario, Canada
    Thanked 6 Times in 4 Posts

    dtech's Tools

    Automotive Booster rod measuring tool

    Automotive Booster rod measuring tool-20150904_090457s.jpg

    Hi I needed a tool to properly measure a brake booster rod to master cylinder for proper adjustment.
    Here is what I made:
    The tool is made from 3/4 by 3/16 inch by 7 inch long steel pieces.
    The brace is welded in approx 2/3 of the way of the legs leaving 2 1/2 inches and 3 1/2 inches to either side. The width of the legs apart is 2 3/4 inches on the outised and 2 3/8 inches on the inside. The screw is simply 5/16 inch threaded rod exactly 7 inches long (precisely the length of the legs of the tool) The one end is chamfered to fit inside the the brake booster plunger and the other end has a nut welded on and is ground flat.

    I use it to quicly check adjustment and booster or pedal return on a system I end up replacing a master cylinder on.

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    Last edited by dtech; Jun 2, 2016 at 06:59 PM. Reason: To add details for readers to build one.

  2. The Following 2 Users Say Thank You to dtech For This Useful Post:

    Jon (Sep 4, 2015), kbalch (Sep 4, 2015)

  3. #2
    kbalch's Avatar
    Join Date
    Jun 2012
    Clermont, FL
    Thanked 531 Times in 383 Posts
    Thanks dtech! I've added your Brake Booster Rod Measuring Tool to our Brake and Measuring and Marking categories, as well as to your builder page: dtech's Homemade Tools. Your receipt:

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  4. #3
    Content Editor
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    Aug 2013
    Thanked 1,857 Times in 1,657 Posts
    First time for me to see a measuring tool like this. Beat the trial and error method I'm used to.

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