Master cylinder seal?

Discussion in 'General IH Tech' started by Rick Herrera, Jun 4, 2005.


  1. Rick Herrera

    Rick Herrera Farmall Cub

    Joined:
    Mar 17, 2005
    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Las Cruces,NM
    Question about the seal thats inserted into the brake booster in which the push rod goes through, between the master cylinder and brake booster. Where can I pick one up at? Autozone and Checkers don,t carry it. The seal is off my 74' scout II and it's about an 1-1/2" to 2" in diameter. Any help would be appreciated.
     
  2. Doug Shailor

    Doug Shailor Guest

    Rick,

    Your subject is master cylinder seal but what you are describing is the seal in the vacuum booster.

    [​IMG]

    You can buy master cylinder rebuild kits that will include all the MC seals but I don't believe booster rebuild kits are readily available let alone just the shaft seal. At least I have never seen any available any where and I look at a lot of parts sources.

    You are not likely to get anything in there with the MC bolted up to it. That is unless the rear seal of the MC is leaking. If that is the case the brake fluid will eventually destroy the booster. If the internal vacuum is leaking then it is time for a rebuild booster or a hydroboost to replace it.
     
  3. Rick Herrera

    Rick Herrera Farmall Cub

    Joined:
    Mar 17, 2005
    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Las Cruces,NM
    Well about the master cylinder leaking fluid into the booster, It did happen. I had to replace the master cylinder(new) and the booster(used) but had to reuse the old seal. It was worn out alittle and the rubber was really soft. It didn't make a good seal around the push rod. I noticed after I put everything together that the motor was running sluggish and rough so I smeared some silicone between master cylinder and booster caused I figured it was sucking in air. Sure enough, after silicone dried, motor runs 100% better but I think in time I'm gonna have a problem with brake fluid in the booster if I don't replace seal.
     
  4. DavidWTravelallfan

    DavidWTravelallfan High Wheeler

    Joined:
    Mar 17, 2004
    Messages:
    2,707
    Likes Received:
    4
    Trophy Points:
    38
    Location:
    Acworth Georgia
    you wont get brake fluid in, That seal is only designed to keep air from leaking in around where the cylinder bolts up. Brake fluid is sealed out by the seals or 0 rings in the master cylinder.
     
  5. Vancopbs

    Vancopbs Farmall Cub

    Joined:
    Feb 9, 2005
    Messages:
    166
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    South Gate, CA
    Call me, I'll send ya one.
     
  6. EricHinds

    EricHinds Farmall Cub

    Joined:
    Aug 25, 2015
    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    1
    Hey Rick, did you ever find a place to purchase that seal between the MC and the booster?.. I just pulled my MC and noticed that mine is completely gone and it's been causing a massive vacuume leak..
     
  7. NorCalMike

    NorCalMike Farmall Cub

    Joined:
    Mar 7, 2019
    Messages:
    31
    Likes Received:
    2
    Trophy Points:
    8
    Location:
    Northern California
    Eric Did you ever find this seal?
    I am having this same problem with my 78 Scout. I have a vacuum leak where the push rod come out of the front of the booster. I am having trouble finding this seal online anywhere. Is there a similar GM, Ford or Chrysler part that can be used?
     
  8. Sozzy

    Sozzy Farmall Cub

    Joined:
    Oct 7, 2015
    Messages:
    340
    Likes Received:
    56
    Trophy Points:
    28
    Location:
    Southern Idaho
    I'd simply replace the whole booster. Not too expensive and an easy fix. AutoZone had one for me.
     
    scout2000 likes this.
  9. scout2000

    scout2000 Dreams of Cub Cadets

    Joined:
    Nov 2, 2011
    Messages:
    4,008
    Likes Received:
    937
    Trophy Points:
    113
    Location:
    DFW, TX
    +1

    If you have a unique/oddball booster, rebuild kits are available. I (unfortunately) had to go down that path once.

    I think that the most amazing thing from your post is that (your) AutoZone, not only knew what an International was, but was able to get a part for one. I don't even try anymore at the ones in my local area.
     
  10. Sozzy

    Sozzy Farmall Cub

    Joined:
    Oct 7, 2015
    Messages:
    340
    Likes Received:
    56
    Trophy Points:
    28
    Location:
    Southern Idaho
    As luck would have it, my wife works there, and one of their managers used to drive a Terra. Everyone at the local store knows what a Scout is. I went to the local Advanced a couple weeks ago for valve cover gaskets, and the poor kid tried to sell me a set for a small block chivvy... Ewwww.
     
    scout2000 likes this.
  11. scout2000

    scout2000 Dreams of Cub Cadets

    Joined:
    Nov 2, 2011
    Messages:
    4,008
    Likes Received:
    937
    Trophy Points:
    113
    Location:
    DFW, TX
    I'm going to label you as a "blessed man", with a wife who works at a knowledgeable auto parts store.

    My hat is off to you !
     

Share This Page