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Master cylinder question....

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Ben Malinski, Dec 26, 2002.

  1. Ben Malinski

    Ben Malinski Guest

    Will a similar year (84) 1 ton K5 master cylinder fit a 1/2 K5? Any differences? If so, what? Thanks!
     
  2. Sandman

    Sandman 3/4 ton status Author

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    Yep, Mine bolted right on. since I used the 1/2 ton Vacuum brake booster, I had to put a spacer in between the booster and the plunger on the MC. If you get the 1 ton booster, Its all a bolt on.
     
  3. Ben Malinski

    Ben Malinski Guest

    Please explain the spacer between the booster and master? What? 1/2 or 1/4 inch washers? A solid piece of metal? Thanks!
     
  4. Sandman

    Sandman 3/4 ton status Author

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    The 1 ton boosters (at least on my year), the rod that comes out of the front and into the MC sticks out like an inch or so. The 1/2 ton boosters are flush with the surface. I just used a rod that I cut down to an inch or so. I plan on getting the 1 ton booster eventually.
     
  5. m j

    m j 1/2 ton status

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    the question would be "why do that?"
    is your current master to small?
    or just a 'since i was changing it' type swap?
    what bore size do you need?
     
  6. MudFrog

    MudFrog 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    If you get the 1 ton booster, Its all a bolt on.


    [/ QUOTE ]

    It might be for an 84 but not for an 89. I had to lengthen the shaft that goes to the pedal. This was using a 1 ton MC and Booster from an 89 1 ton.
     
  7. Sandman

    Sandman 3/4 ton status Author

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    No kidding? I didnt know that. I wonder what the changes are?
     
  8. m j

    m j 1/2 ton status

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    I am really tired here so forgive the stupid question...

    89 still old body style in 1 tons?(I recall they are but that could be the difference)
     
  9. 79Jimmy

    79Jimmy 1/2 ton status

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    Only in the Crew Cab I believe.

    James
     
  10. m j

    m j 1/2 ton status

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    So if you are correct, does this not solve the "why a 89 1 ton booster didnt fit the old style cab balzer" question?

    by the way, Hello there.
    I dont think we have spoken much or at all.
    If you are out in the Chilliwack area and need a field repair look me up.
     
  11. Sandman

    Sandman 3/4 ton status Author

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    Thats a good point. The 1 ton and the 1 ton extra cab where newer style while the 4 door 1 ton was still the older. I wonder what booster he got?
     
  12. MudFrog

    MudFrog 1/2 ton status

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    I'm assuming I got the 89 1 ton from a 2dr. I let my dad order it through his company so who knows. I told him to just order the 1 ton booster/master from an 89.
     
  13. supernaut

    supernaut Registered Member

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    I have a '75 half ton and would like to upgrade the booster/mastercyl combo to 1 ton.

    Napa shows a one ton part #: NBB501023 for a K30 1 Ton 4WD - Pickup of that year

    Will those components bolt up OK?

    I guess I should make sure I replace the flexy rubber parts in my brake lines before I increase pressure.

    Anything else I should worry about?
     
    Last edited: Dec 4, 2007
  14. supernaut

    supernaut Registered Member

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    I'm concerned about blowing out other half ton parts in my brake system with a 1 ton master cyl/power booster. If no one has any words of wisdom today then I'll just get a 1/2 ton master cyl tonight and install that instead.
     
  15. 3/4 Ton Blazer

    3/4 Ton Blazer 1/2 ton status

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    There was no 1 ton K5.
     
  16. 1977k5

    1977k5 3/4 ton status Vendor

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    I wouldn't worry about upgrading master cylinders. IME, if your brakes aren't good then the blame is with something bad in the system. I have the stock 1/2 ton Blazer master cylinder and can lock up all four tires (42's) at any speed with relatively little effort.

    Swapping from a 1/2 ton to a 1 ton master cylinder does require messing with pushrod lengths.
     

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