The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Suspension

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-21-2016, 01:59 PM   #1
C30Seenemall
Registered User
 
Join Date: Sep 2015
Location: Englewood, CO
Posts: 48
HydroBoost to Vacuum Assist?

Anyone know if it is feasible to convert my 75 Chevy C30 lousy hydro-boost setup to a vacuum assist setup?

The hydro-boost is giving me nothing but trouble!
It has always made the most horrible gurgling, squishy sounds and braking while turning has provided some hairy moments!
Then I accidently over-filled the power steering pump and the noises went away except if I use the brakes now while steering, the power steering capability drops to ZERO!
I'm 64 and trying to steer this beast in tight places is aging me fast!
truck is a Scottsdale Camper Special and I never intend to run a camper or tow anything major with this truck in the foreseeable future.

Any suggestions?
Thanks!
Wayne
C30Seenemall is offline   Reply With Quote
Old 01-21-2016, 03:50 PM   #2
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,934
Re: HydroBoost to Vacuum Assist?

I did this swap for my 89 crew-cab dually so yes it can be done.

Like yours, my hydra-boost never worked properly & leaked everywhere. I based my vacuum system off of a similar year model 3/4 ton suburban. The brake booster has to be swapped & you'll need the correct pedal for a vacuum set-up.

While it may not be 'as good' as a 100% new
hydra-boost set-up, it works much better than what was there.
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides
@rattlecankustoms in IG

Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
SCOTI is offline   Reply With Quote
Old 01-21-2016, 03:59 PM   #3
C30Seenemall
Registered User
 
Join Date: Sep 2015
Location: Englewood, CO
Posts: 48
Re: HydroBoost to Vacuum Assist?

Quote:
Originally Posted by SCOTI View Post
I did this swap for my 89 crew-cab dually so yes it can be done.

Like yours, my hydra-boost never worked properly & leaked everywhere. I based my vacuum system off of a similar year model 3/4 ton suburban. The brake booster has to be swapped & you'll need the correct pedal for a vacuum set-up.

While it may not be 'as good' as a 100% new
hydra-boost set-up, it works much better than what was there.
Thanks for the response!
Would a vacuum booster for a Scottsdale of the same size and year work?
I already have a new one of those.
What is different about the pedal? Or is it the rod from the pedal?
(I'm proving this is my first mid-70's pick up)
Wayne

Thanks!
C30Seenemall is offline   Reply With Quote
Old 01-21-2016, 09:21 PM   #4
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,934
Re: HydroBoost to Vacuum Assist?

Quote:
Originally Posted by C30Seenemall View Post
Thanks for the response!
Would a vacuum booster for a Scottsdale of the same size and year work?
I already have a new one of those.
What is different about the pedal? Or is it the rod from the pedal?
(I'm proving this is my first mid-70's pick up)
Wayne

Thanks!
The pin for the pedal is located in a different place (vacuum brakes require a different ratio vs HB). The rod from the pedal can be re-used. For my dually, Hydra-boost was the JB8 brake system. I sourced parts for a JB7 system.
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides
@rattlecankustoms in IG

Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
SCOTI is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:52 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com