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Hydro-Boost ? (I have searched)

sandawgk5

sandawgk5

3/4 ton status
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Oct 28, 2003
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Kitsap County PACNORWEST
I just picked up a Hydroboost set up from a 3/4 ton Suburban from my local Ecology Autoparts and my question is should this be a direct bolt on to my K5 with 350 and is the 3/4 ton master cylinder adequate or do I need to buy a 1 ton master cylinder. I will be installing D60/14ff with large drum. I will go with rear disc in the future.

Thanks

Ira
 
There is a change in the fittings between the years. It will bolt up but the Hydro lines are the issue. I do not remember the dates off hand. What years are your engine and hydrobooster?
 
My hydroboost as well as my steering box both have O-ring hoses. I was more curious about the Booster rod and if the mastere cylinder was adequate.

Ira
 
I believe 1981 is when they started using o-rings. Make sure you get the pedal and pushrod assembly, they are different than the vacuum setups. If your pushrod length is too long, your brakes will drag, too short = low pedal feel...
 
That is one thing that confuses me some say you have to change the pedal and others have said that theres was a direct swap. I did read that write up and it seemed very convoluted. It seemed like a lot of words were used for transmit little information.
 
When I swapped mine I used everything from the pedal to the pump from the donor truck. I compared the pedals, and the pivot point is different, and the pedal has a bigger stud for the rod end to attach to. If I had used my original pedal the rod would have had some play, and been angled a small bit going towards the master cylinder.

The whole affair does bolt in very easily. I got new hoses, master cylinder and pump, and everything works like a champ. Best brakes I've ever had. The system is sensitive to rod length, do a search a pirate board to see how some people have had to work to nake an adjustable rod to get it to work...
 
What is the rod they are talking about. Is it the one that the pedal attaches to or is it the one between the booster and the master cylinder.

Ira
 
DAMN!! i didnt grab the brake pedal from the donor!

is the whole pedal assembly that bolts in different or just the pedal arm itself??
IE in theory just snag the pedal from a Hydro vehicle and swap it into my pedal assembly? (i would look for the correct pedal assembly at the junkyard, but i have yet to see a truck with hydro and a manual tranny).
 
I just bolted the booster and master on in mine. Never changed the pedals and I have no issues. FYI, mine came out of a 79 1ton, all the PS fittings were oring.
 
I am going to put mine in and try it out if I need to get a new pedal I will head back to the yard and pick one up. Is it possible to redrill the pedal that I have or is that not the issue boy am I confused. :doah:

Ira
 
sandawgk5 said:
I am going to put mine in and try it out if I need to get a new pedal I will head back to the yard and pick one up. Is it possible to redrill the pedal that I have or is that not the issue boy am I confused. :doah:

Ira
Click to expand...

Give it a try. Its hard to describe without pics...
 
I installed mine without swapping pedals. The donor truck was a 89 Chevy R/V series 1 ton and the receiver was a 84 Chevy 3/4 ton 2wd. I had to press the middle two studs out of the hydroboost unit cause all 6 were on the firewall on the receiver truck. The middle bolts are really hard to get to and I couldnt get them really tite but they arent that bad. Just use the master cylinder that came with the booster, its easier that way and will work better.
 
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