'69 Chevelle master cylinder question
 

I'm building our '69 Chevelle wagon into a stocker. I'm leaving the rear drums, but am converting the factory front disc over to aftermarket. I've removed the vacuum booster and master cylinder assembly, as well as the factory proportioning valve. I intend to install a aftermarket adjustable proportioning valve. At this point, I plan to adapt a Mopar style master. Does anyone have any idea if a "plug and play" master cylinder set up is offerred? Strange does not make one.

Secondly, I've watched cars like this want to tip over turning corners in the pits. I do not want that with my car. I'm going to keep this project very simple and on a low budget, and am going with a air bag set up in the rear, not an anti-roll bar. If I remove the front sway bar, is it going to do the tip over deal? It does not do that now.

Thanks for any input.

Re: '69 Chevelle master cylinder question
 

Although I run a 70 chevelle, the masters are the same, I have a wilwood master cylinder with the wilwood front discs with rear drums. The master cylinder is not a 'plug and play' I had to carefully slot the holes that mount on the firewall, and the steel brake line fittings off the master had to be reversed ( rear res fitting goes to the front, and front fitting to the rear). I run the factory prop valve in mine although my car had factory front discs on it. One thing to note is you will probably want to get the wilwood master cylinder mount kit mainly for the pushrod retention deal. The line pressure went up huge from the factory master, although the pedal feel is deffinitely softer, hope this helps.

Re: '69 Chevelle master cylinder question
 

Jr,s Wagon has no sway bar and very soft front suspension/Calvert Stuff
on back...........No issues with cornering or turning. Does not drive any different
than his Sedan car. No scratches on his roof rack so far!

Re: '69 Chevelle master cylinder question
 

This one is a bolt in for what you are doing Dan.
NAPA part number M2456

$49 brand new at any NAPA you can sweet talk a wholesale price at.

We supply most of our local "frugal" GM bracket racers with these units.

Re: '69 Chevelle master cylinder question
 

Dan... I used a Wilwood (Mopar style) master cylinder in my 70' Nova. I removed the pedal assembly and ground off the original master cylinder mounting studs and redrilled the new master cylinder bolt pattern and installed 5/16 x 11/4 NF GR8 capscrews and tack welded them to the structure. This will allow you to bolt the master cylinder to the pedal assembly on the work bench. You can now make your own custom push rod and push rod retaining device. Make sure you install a jamb nut on the threaded portion of the push rod and tighten it after your adjustment. The push rod indexing hole in the back side of the master is fairly shallow, so for safety make yourself a push rod guide plate (piece of flat bar with a hole in it) between the clevis at the pedal and the back side of the master and weld it in place close to the backside of the master. You will also have to file the original holes slightly at the firewall to make a perfect fit on installation of the assembly. As for the body roll, having control of the rear suspension is the most important thing.

Re: '69 Chevelle master cylinder question
 

Thanks for the input guys!

Hopefully we can keep the scratches off, too! And frugal, I like that description...LOL...

Re: '69 Chevelle master cylinder question
 

We have a 71 Chevelle Wagon and it does the tip over routine in the pits when turning. It's annoying and looks stupid. We have put a rear sway bar in this winter, and wonder if anything else might get rid of the problem. This tip over business seems to only affect the chevy wagons.

Re: '69 Chevelle master cylinder question
 

Dan, the only thing that is going to fix the roll over with the front sway bar removed is an anti roll bar. When I ran an air bag in my old car, it always twisted on turns. Only after I put the Weibe stuff in, is when that stopped . The drag race anti roll bars do a great job of keeping the suspension level on the launch.

Re: '69 Chevelle master cylinder question
 

Sent you a PM

Re: '69 Chevelle master cylinder question
 

What motor are you going to run in your wagon? What class?

My brother and I run a 71 wagon and use the stock GM dual reservoir master cylinder. We run the stock disc brake system and stock proportioning valve. The car seems to stop fine. The only issue I have had with this set up is if I don't put enough heat in the brake pads before a burnout, the line lock won't hold the car.