You know that master cylinder, the fat looking one everyone seems to use on rods and customs. What years are those from? I ordered one for a 4 wheel disc mid-60s Vette, appears "normal". Rectangular, like most for a Chevy truck, you know? Anyway, the '50 runs and stops, but not as strong as I'd like. Could I have gotten the wrong master cylinder? I've got great firm pedal, and an adjustable prop valve in back. Wilwood 2lb res valves front and rear, mounted near the master. The '50 is 4 wheel disc brakes. I don't really want to add a vacuum booster if I don't have to. Thanks in advance!
I may be wrong, so if anyone can correct me, go for it. I think they are the ones from the 68-82 bodystyle. The one I have sounds like what you are looking for and I think that is what it came from.
How heavy is the vehicle? I put discs on the front of my Chevy Biscayne with rear drums. I went manual brakes because the cam was so big. It was a complete retro system from Master Power. To lock the brakes, you gotta stand on it pretty good. If I had kept the car, I woulda put a HydroBoost on it.
It should come in at 4200 lbs when it's upholstered and fueled up. I think I got a '65 Vette master, but as long as the bore is the same, it shouldn't matter, right? Its still proportioned for 4 discs.
I had the ports hooked up backwards, didn't stop for crap. now with the 1" bore (no power brakes) vette master and discs up front with an adjustable valve on the rear (53 chevy drums), it stops real good. I would guess my car is north of 3500 lbs.
i dont think it matters with 4 wh disc the disc drum matters cause ya have 2 dif size resevours .. more fluid for frnt disc then rear drum
many years ago my buddy and I did manyfour wheeel disc conversions, and got tired of paying the inflated corvette price. We asked the parts guru at our local house to do some checking. He researched it, and it boiled down to a 72 chevelle disc/drum master. Seemed all the numbers went to this master. Started using that one and the brakes worked the same, the price just got better.
http://www.classicperform.com/Store/Master_Cylinders.htm new masters and some even have the ports on both sides of the master.
Well, I checked mine, and it's 1 1/8 bore. I think I'll swap it out for a 1 inch bore master, that should help. I really don't want to add a booster under there if I don't have to.
The 1 1/8th bore is for power brakes & the 1" is for manual brakes '67-'82 vettes. The '65-'66s used a different master than '67-'82. The later one is much more common. Some manufacturers had bleeder screws on the master.
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