Hydro-boost pedals

[johnnychimpo]

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?

 

[sapper]

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

 

[mouse]

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

 

[dremu]

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?

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

-- A

 

[johnnychimpo]

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

 

[mouse]

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

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