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Old Apr 21st, 20, 11:22 AM   #1 (permalink)
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Installing Manual M/C with Factory 4-Wheel discs

I am building an 81 Trans Am for a friend. We are considering ditching the factory M/C and booster and go with a Wilwood manual setup.

I contacted Wilwood to recommend a M/C but they said their biggest M/C, 1 1/8", isn't big enough to supply enough volume for this system. I was surprised to hear that.

Now, it's possible I screwed up in giving them the specs for the system. I gave them the pedal ratio for a manual setup, 6:1, and the caliper piston diameters, 3" front and 2 1/2" rear. I can't measure the rears at the moment so looked around and found the 2 1/2" dimension online. Is this correct?

Has anybody gone with a manual system with 4-wheels discs? We realize the pedal pressure will be increased and he's prepared to deal with that. Hopefully, it won't be too much effort.
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Old Apr 21st, 20, 02:31 PM   #2 (permalink)
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Re: Installing Manual M/C with Factory 4-Wheel discs

Get a 4-wheel disc master cylinder for a 69 Corvette. They have a 1" piston. But you might want smaller than 1" for the manual application .
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Old Apr 29th, 20, 04:19 PM   #3 (permalink)
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Re: Installing Manual M/C with Factory 4-Wheel discs

I just put in 12.7 wilwoods on all four corners and used a GM 19288642 master cylinder non power assist . Has a good pedal
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Old Apr 29th, 20, 04:36 PM   #4 (permalink)
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Re: Installing Manual M/C with Factory 4-Wheel discs

My 70 LT-1 Corvette came from the factory with four wheel disc and no power brakes.
Shouldn't be that hard to set up.
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Old Apr 29th, 20, 06:10 PM   #5 (permalink)
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Re: Installing Manual M/C with Factory 4-Wheel discs

I run 4 wheel discs on my Protour Cars with the Wilwood Master. They work great
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