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Switching from the hydro vac system to dual resistor master cylinder
#1345985 Tue Feb 11 2020 05:29 PM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
I have 1950 GMC 450 dually it's a big truck I got it and though we have bleed the brakes it goes to the floor 1 or 2 pumps and it starts working got under it and found the hydro vac system is all disconnected so I ordered a addapter to put a dual reservoir master cylinder manual no vacum in insted with residual valves well this work in place of the stock master cylinder and hydro vac system

Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346027 Tue Feb 11 2020 10:16 PM
Joined: Feb 2004
Posts: 19,900
H
Boltergeist
No


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346046 Wed Feb 12 2020 12:22 AM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
Ok so what will work

Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346047 Wed Feb 12 2020 12:23 AM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
What can I do

Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346048 Wed Feb 12 2020 12:26 AM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
The hydro vac system is totally disconnected and the brake line comes out of the stock master cylinder with a t to connect front and back I want to drive my truck but dont know about the brakes

Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346052 Wed Feb 12 2020 12:41 AM
Joined: Feb 2004
Posts: 19,900
H
Boltergeist
Replace the Hydrovac- - - -they're available rebuilt from NAPA and several other places. Unless you find some sort of very large diameter dual chamber master cylinder from a motorhome or something similar and totally re-plumb the brake system with a booster, you're going to have a deathtrap that's a danger to you and everyone who shares the road with you. The small bore dual cylinders that are sold in the conversion kits don't move enough volume of fluid to get the shoes against the brake drums without pumping the pedal several times. It's also important to do frequent brake adjustments so the shoes don't have to move very far before coming into contact with the drums. Adjusting the brakes properly will make the truck start stopping with one pedal stroke even without the Hydrovac, but you'll need to spend a lot of time at the gym doing squats to have a strong enough leg to get stopped.

I ran a race car at the Watsonville 1/4 mile dirt track in the late 1970's in the "Northern California Sportsman" class.
Jerry



The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346054 Wed Feb 12 2020 12:53 AM
Joined: Nov 2005
Posts: 5,585
3
3B Online
Master Gabster
Hy Est2rad customs, welcome, as to your brake system, why not restore it to working condition? If you want to change to a dual master cylinder you should not replace the original master cylinder with one that has a smaller bore than the original master cylinder One or two pumps that brings the system back to a working condition would indicate the brakes are in bad need of an adjustment. If it were my truck I would remove all the wheels and brake drums and see what I am dealing with, checking for leaking wheel cylinders, brake lining condition and return spring condition. I don't think you would enjoy driving your truck with a non boosted braking system. Come back and ask questions if you need to.

Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346075 Wed Feb 12 2020 03:28 AM
Joined: Dec 2015
Posts: 2,072
Big Bolt Forum Moderator
I have to agree with Jerry and 3B. Pull the wheels off, check everything, I would at a bare minimum put wheel cylinder kits in all wheel cylinders (pretty cheap) and then replace the steel lines an rubber hoses and hook up the hydrovac (probably meed a rebuilt one). I would also put a kit in the master cylinder. You are probably into brake hoses, tubing, and cylinder kits 125-200 depending on where you buy, and then the hydrovac.


Mike

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Re: Switching from the hydro vac system to dual resistor master cylinder
Est2rad customs #1346079 Wed Feb 12 2020 03:39 AM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
Thanks everyone how could I check the hydro vac canister to see if it works I heard from a friend they do work good when they are set up right I just started working on the truck it has 85000 original miles it was a farm truck and for the last 20 or so years it's been an historic vehicle the truck is in great condition but this is my first big truck it has the stock I guess 216 and it has a 5 speed transmission with the 2 speed rear end the wiring harness has some bad spots but I have an aftermarket wiring harness and the adapter to put a alternator in to go to 12v I dont know how to put pics up to show you guys what it looks like

Re: Switching from the hydro vac system to dual resistor master cylinder
Hotrod Lincoln #1346086 Wed Feb 12 2020 04:05 AM
Joined: Feb 2020
Posts: 36
E
Wrench Fetcher
My dad when I was a kid helped a lot of the sportsman guys build and fix thier cars

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