HamadUP

I discovered a leaking point in the hydroboost unit, is it rebuilable? anyone have done it before? and where can I get the kit needed for the rebuild?

Also I'm really worried about the pressurized canister, I think I have to take the pressure out somehow, but I don't know how to re-pressurize it again!

CA-Legal-Vette

Seal rebuild kits are available. I got mine on ebay but if you know the donor of your unit or have a knowledgeable parts store, you can certainly get the kit there. This should keep the fluid in the unit but the actual internal mechanism is not rebuildable. It's fairly tightly machined.

As for the canister, if you press the pedal a couple of times (or the rod if the unit is out) there shouldn't be any pressure remaining. Take precautions just in case though when removing it. There should be a new pressure canister in your rebuild kit. These are charged with nitrogen so don't remove the protective tab until you're ready to install it. Again, it isn't under pressure, you just don't want to dilute the nitrogen with the other non-inert gasses in air.

You represurize the unit by running it. Think of it as the same reserve provided by a power brake booster in case the engine cuts out only using gas pressure instead of vacuum. Both will only provide a couple of assisted applications before the reserve is used up.

CA-Legal-Vette

I found a nice schematic on line that also includes some troubleshooting:

http://www.tpub.com/content/construc.../14050_160.htm

The diagram properly shows the pressure cylinder to be called an accumulator, which is a better way to think of it.

HamadUP

Thanks CA , the unit came from a '94 astro van, I will go to the parts store and ask them about the kit.

73 stingray

did you ever find a rebuild kit for your hydrobooster?

I just got 2 hydros from a junk yard and need to clean them up