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JB7 Conversion?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by btolenti, May 25, 2006.

  1. btolenti

    btolenti 1/2 ton status

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    Anyone know if a JB7 master will bolt onto a stock K5 power booster? I have seen posts saying yes, it will bolt right on, and no, it will require the JB7 booster.

    My master has a small leak, so it needs to be replaced, so I figured if I could upgrade....I should.....

    I have an 86 K-5, and was considering a master from a 86 K20 with JB7 brakes... From what I can tell, the difference, if any is booster pushrod length, but like I said, some have posted that the 3/4 ton master swap is a bolt on deal....
     
  2. muddybuddy

    muddybuddy 3/4 ton status

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    jb7 should bolt right up, jb8 wont (hydroboost)
     
  3. Jonny-K5

    Jonny-K5 1/2 ton status

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    is there any increase in stopping power going to the 3/4t master on 1/2 brakes? or is it just a "this will also fit" kinda deal. i could see it helping maybe if you've done a 3/4t or 1t axle conversion, but what about an otherwise stock truck?
     
  4. 79k20350

    79k20350 3/4 ton status

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    everything that ive read say the master has a bigger borer and wont fit...:confused:
     

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