did I screw up?

[bacfire]

I recently swapped a dual master cylinder into my '66. The previous owner had installed Granada front discs, but had left the old fruit jar in place. The power brake booster was shot as well.

Rather than using a stock-type proportioning valve/distribution block, I just created two totally separate systems front and rear (or so I thought) and put an aftermarket proportioning valve in the rear line. Now someone who should know tells me that I've not improved brake system safety at all over the single master cylinder; that if I lose pressure in one wheel, I lose the whole system. I was under the impression that the two reservoirs/outlets on the master cylinder were completely separate. Is this not true? Is there fluid transfer inside the master cylinder?

 

[rbohm]

yes you totally screwed up and now you have to ship your car to me along with the title signed over to me


as long as you plumbed the front brakes to the larger reservoir and the rears to the smaller one, you are good to go. the adjustable proportioning valve as you know will allow you to adjust the pressure to the rear drums to balance the system. it sounds like you did just fine, and the person or people who are telling you that you screwed up are wrong.

 

[2+2GT]

+1 You are right, "someone" is wrong.

He's probably thinking too conventional, with a single divider block serving both halves, and a warning sensor in the middle. Pre-67 cars do not require the sensor, therefore do not require the single block.

This is what he expected to see:

 

[bacfire]

Thanks for the peace of mind, guys. Those "someones" were local dealership techs (they quit calling 'em mechanics for a reason), one of whom had been around long enough to know better. Guess it's been a while since they've seen anything sans an ABS box.

 

[tx65coupe]

My car has Granada brakes and I set it up the same way you did.