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Old 12-19-2003, 09:46 AM
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which master cylinder?

My brother in law has given me a brake pedal assembly from a 66 buick special for use in my 39 chev PU. Anybody know what master cylinder will work with this assemly? I considered a stock Buick cylinder but they all list for drum/drum and are single resevoir and I am set up for disc/drum.

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Old 12-19-2003, 10:13 AM
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Most aftermarket brake installations use the Corvette dual master cylinder with a 1" bore.

Vince
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Old 12-19-2003, 10:47 AM
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But do all master cylinders have the same mounting pattern?
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Old 12-19-2003, 12:41 PM
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Most auto mfgs make very few changes in this area. GMs seem to interchange easily. The big Buicks of the mid 70's thru mid 80's all run disk/drum. A trip to your local wrecking yard ( the ones that let you go in) should help you find what you need. My mc/power booster on mt Vette project was rusty and I went hunting in the local yard and wound up with a 1976 Buick Century set up. I had to modify the push rod slightly and am using my proportioning valve as the Vette has four wheel disks. The unit is about 10% bigger and should reduce pedal pressure the same. It bolted thru the firewall, cleared the engine and lined up with the pedal perfect. Generally speaking a bigger booster/master cylinder will give you a better brake system.
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Old 12-19-2003, 07:33 PM
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I would just go with a disc/drum master cylinder from a 70's mid sized vehicle ... as the post above states, these are plentyful in the boneyards if you can find a good one or even one to use as a core ... even at the parts store these masters are relatively inexpensive.
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Old 12-20-2003, 06:31 PM
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Use one from a wrecking yard as a core, rebuilt or new master cylinders are just too cheap to be using wrecking yard stuff.

Vince
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Old 12-20-2003, 07:28 PM
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Are you planning on putting the brake pedal on the firewall or in the original position under the floor?
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Old 12-21-2003, 12:28 PM
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poncho, Implanning on the firewall.
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Old 12-21-2003, 12:33 PM
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You will need to reinforce the firewall. Mounting a hanging brake pedal and master on the firewall puts a lot of strain on it. You don't want it to flex when you push on the brake.

It shouldn't matter if the nounting of a master that you decide on is the same as the Buick, you have to drill new holes anyways.
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Old 12-21-2003, 04:20 PM
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thanks guys, Firewall has been taken care off, I doubled up the metal when I smoothed it, its pretty stiff. I also welded a support brace behind the dash from side to side to hang the column from. Should be able to add additional support to the pedal assembly from this point too.
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Old 12-22-2003, 01:30 AM
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When I added power brakes to my 53 Ford sedan I used the pedal assembly from a mid 70's T-Bird. Along with a place to hang the pedal I got steering column mounts and the assembly bolts up to the firewall and the brake booster then mounts to it. I used the T-Bird unit because it was handy and fit with almost no altering.

p.s. Page 2 in my gallery has a pretty good pic of the booster from the engine compartment.
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Old 12-22-2003, 01:42 PM
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HEY STEA: On www.mpbrakes.com they show a number of universal street rod set up pedal and master cylinder combo's. It might give you an insight on what parts to use. I agree not to waste time and money on a wreck yard special ...The master clylinder may be the reason it is in the junk yard... GOOD LUCK...DAVE
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Old 12-22-2003, 02:09 PM
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Check out a MC from a 68-69 chev. Impala disc drum. I bought one from NAPA for about 40 bucks brand new, no core charge needed. works perfect...........GlennK
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Old 12-22-2003, 05:01 PM
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booster diameter??

What was the diameter of the 68-69 Impala booster? I have the tall Edelbrock valve covers for my rollers and have an interference problem.
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Old 12-22-2003, 05:57 PM
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The Booster I have is 11 inch but you can use a smaller one. I have the same problem you do with the valve covers but I can just barely get them off with much jockeying and afew choice words... I am going to get a smaller one in the future, but right now its working ok....GlennK
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