Years ago I converted my 70 GS from manual aluminum drums to power by just adding a booster and master cylinder to the factory setup. Years later I installed a Wildwood setup on the car and they recommend that I use a Corvette manual disc master cylinder with this application. I purchased a new one but of course it has a few difference's....the brake lines on the GS are the same size for both bowls while the vette master cylinder is two different sizes. My questions are: 1) Can I use the existing brake rod (from the booster to the brake pedal or do I need to locate a replacement? 2) Which hole (or does it matter?) do I use to connect the brake pedal to the rod from the master cylinder? I belive there are two on the brake pedal..... 3) I assume I can just swedge the vette master cylinder fittings up or down to accomadate the different size of the GS brake lines? Anything else I need to be aware of when using this other master cylinder? Thanks for the help.....
Think About This. If you could return the Vett master cyl. I would consider using the correct GM Booster and Master cyl. for your car. From what I can tell, your saying years ago you converted from manual Drum Brakes to power Drum Brakes , your now wanting to convert to Disc? #1 Using OEM correct parts for the car will look factory correct under the hood and be easied to install, Less mods. When converting from manual to power master cyl you can get aftermarket oem style tubing, or if you have to bend your own and change the fittings . you will need a flaring tool capable of doing a double flare. Also dont forget that when converting from manual to power brakes you should change the proportioning valve. As far as Rotors and Calipers if your aftermarket set up should be fine. Note :When changing Brake Caliper hoses from drum to Disc.the hose frame brackets some cars {71 Buick GS} have a different shaped mounting hole to lock the hose to the frame.
Keith, I have no idea why they would recommend a Vette master since all Vettes since 65 had 4 wheel disc brakes. I agree with Freak...get the original set-up and redo yours. Your 70 has a distribution block on it and not a combo/prop valve. The 70 disc versions had a hold-off valve under the master bolted to the booster and a rear L-shaped delay valve. See the article on the site below for changing from drums to discs. Reason why the Buick line doesn't work on the vette cylinder is the line you have is for drums and not discs. Disc cars use a larger front line because the calipers require/use more fluid flow compared to drum wheel cylinders. I would not bother reflaring/bending your own lines.....visit www.inlinetube.com and get the correct lines. They also carry the correct combo/prop valve frame mounting bracket for $20. I have the original AC Delco combo valves for sale for $40. See attached pic.
Good point, Great deal George, I was not aware there was a difference between 70 and 71 set up on the valves. So thats why,,, I was confused when I saw Master/Booster sales pics. with the valve mounted under it. Also I agree with new line. Great price on the valves you have for sale.
