The Stovebolt Site Forums The Parking Lot Big Bolts Hydrovac brakes

I am looking for hydrovac brake components for my '50 GMC two ton. Does anyone have any for sale or know where I can find some?

Try an ad in the Swap Meet section right here on this site.

Also check NAPA.
There are newer versions still used, or more recently used on trucks. If you aren't going to be original you may find a cheaper and easier to get perhaps even better replacement for the original. I know my local NAPA has a picture book with a number of different newer ones to pick from.

Grigg

Thanks Grigg. I will look into it at my local NAPA. How recently did they have that kind of equipment? Do you have any idea of a make, model, and year that I could start with?

I don't know exactly, personally I would (and have) run a hydrobooster with a dual circuit master cylinder, so I haven't fully researched the replacement hydrovac units.

Seems I've seen them on 80's model ford medium duty trucks.
And on lots of imported cab over trucks usually on the right side just behind the battery box, at least that's what I think they are..

Grigg

I got mine rebuilt at fleet pride, I think their nation wide. It was pretty cheap and quick and the brakes are working well - good luck.

NAPA should also have a connection to have your unit rebuilt.
As for use, they are still built and used on forklifts. Cost can be the real issue in the long run.

hey there, I have a vacuum booster unit that came off a 54' model 630, dont know if that would help u or not, I sold my gasser and went with air brks.

Are you missing the Hydrovac completely? I couldn't rebuild mine because the end cap was broken. I had to buy a new unit. You can get one at http://vehiclesofvictory.com/. I had to change the two fittings, the inlet and outlet because they were not the same size, but that was no problem. Just be sure that when you remove them you don't let the lubricant leak out.

I just put a Hydrovac unit and master cylinder in my 73 C60. That might be something to look into. It only cost $65 for the master from NAPA and $135 for the Hydrovac. The set up looks pretty universal and would be easy to adapt to most vehicles.

Just a thought.

Bodyguy, do you have those NAPA numbers on hand?
I'm also going through my brakes and i'm missing my hydrovac.
Thanks,
Alex

$135 for a Hydrovac or a vac booster? Just askin coz there's a big difference between the 70's & 50's bolts. The cheapest I could find a new Bendix Hydrovac for my '56 was pushin $400.

If one isn't real particular about keeping it stock, I have seen a couple aftermarket brake systems that use dual m/c & saw one kit that used two small booster cans that could be adapted to our older bolts (cant seem to find that link, sorry).

Or, there's this frame mounted hydrobooster kit for $500

The Napa P/N for the master is 10-57577. I don't have a part number for the Hydrovac. I bought that from a local truck parts facility (Bott's in Woodstock, IL) I do however have a service manual - i'll try to see if they are listed in their and i'll look at my new unit to see if their is a p/n on it.

I got a direct replacement for my 65 C50 wrecker at napa.They had a part #for it and it only took two days to get. I think it was around two hundred with my old one for a core. This was only a year ago. Hope this helps.

Hey guys,

My question is about master cylinders. More specifically are there two on Hydrovac trucks?

I have a single pot under the hood and then there is another master cylinder looking device about 1/2 way down the frame rail (well past the Bendix on the drivers side) the previous owner bypassed this piece while running new lines.

What the heck is it?

Brian,

School buses in the mid 60's used a dual master cylinder with two separate hydrovac boosters. One circuit fed the front wheel cylinders and two of the four cylinders on the rear wheels. The other circuit fed the remaining two wheel cylinders in the rear brakes.

This setup may have been used on bigger trucks but it's been a while since I looked at the diagram.

If there was not a bloody monsoon going on outside right now, I'd snap a photo...

I know where you're coming from. That monsoon lasted three days here in Va. Beach...