C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Selecting a Master Cylinder and Booster

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Old May 5, 2014 | 11:07 AM
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Default Selecting a Master Cylinder and Booster

Hey all! Need some help selecting the right master cylinder and booster for my truck project. Right now I have a IFS from a 90 C4 and getting a IRS from a 96 C4. Both are complete with brakes. Since I'm finishing the cab repair, I need to think about the MC and booster setup I want to run so I can add support under the dash. Stock truck had the setup under the floor. I want to run a fire wall mounted setup but not sure what setup I need to purchase. I would like to get a chrome or polished aluminum setup.

With what brake setup I already have, I don't know what setup I need to get. Can you all lend a hand? I appreciate it.
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Old May 5, 2014 | 12:02 PM
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Originally Posted by FarmerSid
Hey all! Need some help selecting the right master cylinder and booster for my truck project. Right now I have a IFS from a 90 C4 and getting a IRS from a 96 C4. Both are complete with brakes. Since I'm finishing the cab repair, I need to think about the MC and booster setup I want to run so I can add support under the dash. Stock truck had the setup under the floor. I want to run a fire wall mounted setup but not sure what setup I need to purchase. I would like to get a chrome or polished aluminum setup.

With what brake setup I already have, I don't know what setup I need to get. Can you all lend a hand? I appreciate it.
Hydra-boost and there are a few ways to accomplish it. The later Astro vans seem to be the least expensive and there are also some specialty vendors out there. That would certainly give you the better performance. There's of course many firewall mounted possibilities and I would maybe find a truck with similar components and drive-line to see how it was accomplished. Myself if I were doing it - hydra-boost! You'll see reference to hydroboost but I've never seen hydraulic spelled with an O so I'll stick to the Hydra-

Last edited by WVZR-1; May 5, 2014 at 12:06 PM.
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Old May 5, 2014 | 01:08 PM
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Thanks man! I am looking for builds similar to mine for idea's. Kinda looking for a nice show piece for under the hood.
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Old May 5, 2014 | 07:19 PM
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So none of you Vette guru's know what MC booster Hydroboost specs I should be looking for in a new setup? It would be nice to have a sharp looking setup under the hood.
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Old May 5, 2014 | 07:28 PM
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Originally Posted by FarmerSid
So none of you Vette guru's know what MC booster Hydroboost specs I should be looking for in a new setup? It would be nice to have a sharp looking setup under the hood.
Since you want firewall mount I'd take a walk through a "pick & pull" to see what makes you happy OR just spend the several hundred dollars more for the "pretty stuff". You need to be concerned with your power train because you'll need a PS pump that can be plumbed for the HB.

I would think you would want a Saginaw Type II pump likely with a remote reservoir similar to the C4 but be able to be plumbed for the HB.

Every thing would depend on the front accessory drive that you're intending to use for whatever engine!
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Old May 5, 2014 | 07:38 PM
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Thanks WVZR-1. Regardless what I want, I need to know what specs of the parts I should get for the C4 brakes I already have. Like if I wanted to order a setup from Wilwood. I do want the "pretty stuff" or a nice looking setup. What's HB? I'm running a 1995 LT1 for an engine and also have the power steering pump that came with the 1990 Vette IFS.
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Old May 5, 2014 | 07:48 PM
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HB - hydra-boost I seldom use acronyms but I thought HB might fly. You'll need an LT1 pump I'm quite sure, I'd have to study that a bit. Now if you were using maybe someone's front end drive package for AC, alternator and the like then their pump arrangement would be the desired regardless of the type of brakes.
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Old May 5, 2014 | 09:04 PM
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Should have thought about the HB a bit more. Looking at the March Performance kit. This is getting to be more tricky than I thought.
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Old May 5, 2014 | 10:19 PM
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Wilwoods are cheap look good and will work on stock brakes
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Old May 6, 2014 | 02:28 AM
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Be careful about choosing the Hydraboost. The '90 LT1 pump was designed for the Corvette power rack , but may not have the capacity to supply the rack and the brakes at the same time. You may feel a little "kick" in your steering if you're in a corner and jump on the brakes at the same time. How big a "kick"? I don't know, I'm just looking at the engineering design, and the comments of other street rod builders. I'd recommend a double diaphragm vacuum booster for best performance.
Classic Performance Products has some well designed and attractive vacuum power booster set-ups. They're in Placentia CA, 800-823-1068. They have a good tech department, too. They may ask you to call on their other number 714-522-2000 for tech information.
I worked on an Olds with the Hydraboost, and it had an oversized power steering pump.


Last edited by Hot Rod Roy; May 7, 2014 at 02:25 PM.
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Old May 6, 2014 | 08:27 AM
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Thanks for the reply and info Roy. I will call them and see what they say. Just to make sure everyone knows what parts I have already. I have a 1995 LT1 still in car running and driving. A complete 1990 Vette IFS with rack, power steering pump and reservoir with rotors and calipers. On it's way is a 1996 D44 IRS complete with rotors and calipers.

Thanks again everyone.
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Old May 6, 2014 | 09:07 AM
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Originally Posted by Hot Rod Roy
I worked on an Olds with the Hydraboost, and it had an oversized power steering pump.

Not "oversized" but just a P-series pump. Hydraboost systems use an accumulator for some of what you're attempting to influence are the downfalls of the Hydraboost. I believe you used the term "kick". True that the Saginaw Type II pump creates more aeration than a P-series but with a proper remote reservoir and maybe even a cooler that becomes a non-issue. The pump can also be tuned for pressure and volume so there's little reason not to do a hydraboost if it "desired" or more appropriate for the build.

There are certainly many options available to the OP and each likely have their own pro and con points.

Only the OP can determine that and make decisions. regardless of the decision there's a good bit to make the choice effective. Pretty not as difficult - effective maybe more difficult.
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Old May 7, 2014 | 02:26 PM
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Originally Posted by WVZR-1
Not "oversized" but just a P-series pump. Hydraboost systems use an accumulator for some of what you're attempting to influence are the downfalls of the Hydraboost. I believe you used the term "kick". True that the Saginaw Type II pump creates more aeration than a P-series but with a proper remote reservoir and maybe even a cooler that becomes a non-issue. The pump can also be tuned for pressure and volume so there's little reason not to do a hydraboost if it "desired" or more appropriate for the build.

There are certainly many options available to the OP and each likely have their own pro and con points.

Only the OP can determine that and make decisions. regardless of the decision there's a good bit to make the choice effective. Pretty not as difficult - effective maybe more difficult.
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Old May 7, 2014 | 03:21 PM
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Buy new & buy stock components
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Old May 7, 2014 | 06:18 PM
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This is getting harder than I thought. All I'm looking for is a unit that will work with stock C4 brakes but is much better looking under the hood. I don't know all the technical stuff that's been mentioned. That's why I asked. Has no one here installed a nice Wilwood or other unit in their Vette that's a direct replacement?
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Old May 7, 2014 | 06:41 PM
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Originally Posted by FarmerSid
This is getting harder than I thought. All I'm looking for is a unit that will work with stock C4 brakes but is much better looking under the hood. I don't know all the technical stuff that's been mentioned. That's why I asked. Has no one here installed a nice Wilwood or other unit in their Vette that's a direct replacement?
You aren't the first to use a C4 IFS and IRS so what I would do is find a similar build truck that has IFS/IRS and speak to the owners and find out how it works and what they might do differently if they had it to do over. I understand your thoughts BUT still for your build you need to find something that someone mentions "works well" - fits the firewall and has appropriate pedal location for operation.

I've seen several on custom chassis but not in a truck application so firewall size and available real estate for the mounting I'm certainly not familiar with. I've participated in a couple of builds.

Your firewall and pedal mounting can't actually be compared to a C4 install.
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Old May 8, 2014 | 01:21 AM
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Originally Posted by FarmerSid
This is getting harder than I thought. All I'm looking for is a unit that will work with stock C4 brakes but is much better looking under the hood. I don't know all the technical stuff that's been mentioned. That's why I asked. Has no one here installed a nice Wilwood or other unit in their Vette that's a direct replacement?
Sid, let's be honest here. You're working with a life-or-death situation when you're building a truck!! If you don't understand the suggestions you've been given, you need to do more of your own research. Nobody can answer the conflicting requirements you have posted here! It's your truck, after all, and you are responsible for building a safe vehicle. Nobody here wants to be blamed if something goes wrong!!!

You might also try Flat Out Engineering www.flatout-engineering.com They do Corvette suspensions in a variety of trucks and other non-Corvette's.


Last edited by Hot Rod Roy; May 8, 2014 at 11:58 AM.
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