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Hydro-boost pedals

Discussion in 'The Garage' started by johnnychimpo, Jul 20, 2006.

  1. johnnychimpo

    johnnychimpo 1/2 ton status

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    I'm converting to hydro-boost in my '79 K20 4spd. How can I tell any differences in 1/2-3/4ton vs 1ton brake pedal assemblies? I have searched the forums and know that a set from a 1ton will give more piston travel ,but after pulling some from a K30 4spd I found that the truck had been converted from auto to man.So I'm not sure what they came out of. Anybody help me out so I don't have to pull my current pedals just to compare. Pics maybe?
     
  2. sapper

    sapper 1/2 ton status GMOTM Winner

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    I pulled the pedal on the donor truck I had for hydro boost to find that it was identical to the pedal I had in my 89 K5, so I threw it away
     
  3. mouse

    mouse 1/2 ton status

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    When I converted the pedals were different, so I just used everything from the donor.
     
  4. dremu

    dremu Officious Thread Derailer Premium Member

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    The pedal for a hydroboost is mostly the same as a vacuum, but the hinge point for the booster connection is about an inch farther up. I would not say it's 1/2-vs-3/4-vs-1-ton so much as vac-vs-hydro ... remember, the diesels came with hydro in 1/2 and 3/4's.

    If you don't have them side by side they look damn identical, but as I discovered, they ain't :doah:

    -- A
     
  5. johnnychimpo

    johnnychimpo 1/2 ton status

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    Thanks dremu, I'll get out the measurin' stick and check before I pull the ones in my truck.
     
  6. mouse

    mouse 1/2 ton status

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    Thats what I did, and why I used the one from the 1/2 ton diesel the system came from.
     

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