Hydroboost Mounting Plates

[1971gophercatcher]

I am currently converting my Power Front Disc Rear Drum brakes to hydroboost on my 71 Cheyenne Super. I pulled a hydroboost off a Astro Van. My question is do I need a Proportioning Valve for this new setup?

I am replacing the master cylinder and power steering pump. (Going new on these that would go on 1982 3/4 ton suburban diesel)

Thanks a ton in advance.

[DonLeverton]

Originally Posted by 1971gophercatcher

I am currently converting my Power Front Disc Rear Drum brakes to hydroboost on my 71 Cheyenne Super. I pulled a hydroboost off a Astro Van. My question is do I need a Proportioning Valve for this new setup?

I am replacing the master cylinder and power steering pump. (Going new on these that would go on 1982 3/4 ton suburban diesel)

Thanks a ton in advance.

If I understand you correctly, you had a vacuum booster that was in working order previously?
The way that I understand it, you need a dual master cylinder and a proportioning valve from any disc front / drum rear braking system.
I used a proportioning valve, formed steel brake lines, and mounting bracket from an Astro Van. I like it because it’s neat and compact.
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[Captainfab]

Yes you still need a proportioning valve with a hydroboost just as you do with a vacuum booster. You should be able to use the same one you had with the vacuum booster.

[mcmlxix]

Just sent you an email .... I bought the booster bracket from you back in 2011 and was using the OEM plate from the donor truck.... Well the other day I ruined the little anti-rotation tab during disassembly.... so I need a replacement plate...

[Captainfab]

I replied to your email.

[Blue hauler]

Have you ever had someone use your hydro boost brackets on a square body truck?
Thank you!

[Captainfab]

Not that I know of, but not everyone tells me what they are doing. There is really no need to use one of my hydroboost mounting plates on a squarebody since the squarebodies were available with hydroboost from the factory. All you need is a hydroboost for a squarebody truck and it'll bolt right up to the factory mounting holes. Additionally using one of these mounting plates will not mount the hydroboost to a squarebody firewall correctly and without modification.

Originally Posted by Blue hauler

Have you ever had someone use your hydro boost brackets on a square body truck?
Thank you!

[mcmlxix]

Originally Posted by mcmlxix

Just sent you an email .... I bought the booster bracket from you back in 2011 and was using the OEM plate from the donor truck.... Well the other day I ruined the little anti-rotation tab during disassembly.... so I need a replacement plate...

Here is the #captainfab HB plate and firewall mount with my 2005 HB and MC. I added a bracket for the Wilwood proportioning valve to the side of the firewall mount... Just need to sort out the lines..

Can someone confirm the Hydro-Boost Lines:
HI input - FROM Power Steering Pump
HI Output - TO Power Steering Box
LO Output - RETURN to reservoir