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Thread: Brake Booster Push Rod Adjustment

  1. #1
    BackDoorZ BackDoorz's Avatar
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    Default Brake Booster Push Rod Adjustment

    I havenít seen anything like this in the forums and it maybe another way that everyone is doing this. Anyway, thought I would add my way.

    I recently installed a Brake Booster on my 1976 280Z. When it came time to bolt up the master cylinder to the brake booster, I knew that I was going to have to make an adjustment on the push rod that goes into the master cylinder from the brake booster. If you have ever done this job, it's sort of guessing game on just how much you should turn the push rod in or out.
    After looking at the whole setup for awhile, I think I have come up with a way that will get you pretty close.

    - Insert a small screwdriver into plunger opening of master cylinder until it
    stops.
    Click image for larger version. 

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    - Make a small red mark on the screwdriver at the end of the master
    cylinder that goes into the brake booster.

    Click image for larger version. 

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    - Take the screwdriver and lay it next to the master cylinder.

    - Line up the red mark even with the end of the master cylinder and make a
    blue mark on the screwdirver next to the face of the flange (where the
    bolts go through) that goes next to the spacer on the brake booster.

    Click image for larger version. 

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    - The distance between the end of the screwdriver (tip) and blue mark is
    how much the rod from the brake booster can go before it starts to move
    the master cylinder plunger.

    - Take the screwdriver and place the tip to the diamond shape spacer on
    the brake booster. Compare the distance of the rod from the brake
    booster against the distance from the tip of the screwdriver and the blue
    mark and adjust push rod accordingly.

    Click image for larger version. 

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    Notes: The master cylinder actually sticks into the brake booster up to the
    flange. That is the reason for measuring from the end of the master
    cylinder to the plunger. Red & blue markings are my own choice,
    any markings will do. Any straight object will work for marking, I
    used a small screwdriver. Make sure that push rod is pushed back
    as far as it can go into brake booster.

  2. #2
    Registered User Jarvo2's Avatar
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    Default

    Thanks for the writeup! I did a round of guessing the last time I replaced the brake booster.
    Dave
    Windy City Z Club (Chicago)
    1972 240z, restoration in progress
    http://jarvas240z.blogspot.com

  3. #3
    Registered User siteunseen's Avatar
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    Default

    Yes, thank you. I have to replace on myself.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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