htwheelz67

I have a 67 with stock kelsey hayes front discs, I am installing my versailles rear end but swapping out the brakes for 2000 cobra units. I have the stock style booster, disc drum m/c with adj prop valve installed. What master cylinder should I use, bore size etc...some say I can use mine if there is no res pressure valve in it, I have been told anywhere from 15/16 to 1 1/4 bore......I want a master cyl with the outlets in the stock location and that will fit with the stock booster......HELP!

2+2GT

Mustang SVO master cylinder will do.

htwheelz67

outlets are on the wrong side and the end needs to be shaved.......

JMD

The stock 67 m/c for disk brakes SHOULD work fine.

While I don't KNOW, I THINK that the volume produced by the 67 m/should be ok for the rear brakes. In any case, a stock 67 m/c is cheap enough to buy and simply try it out. Of course front brake function will be right, the only consideration will be rear brake function. I think it will work fine.

I don't THINK the 67 has RPVs in the outlet ports, but if so they will come out easy enough.

If rpvs are not present in the m/c IMO 3 psi rpv's should be used.

My son's 66 uses Wilwood fronts, SSBC rears, through a SSBC adjustable proportioning valve, from a stock 67 m/c.

We did not need to make any adjustments to the prop valve but if bias would have been an issue we could have made some adjustment.

I did not use a prop valve on the conversion of my 55 Lincoln to a dual m/c, just RPVs for the stock drums.

A prop valve is not always needed... but still something to consider... If the bias produced by the stock m/c is not right, a prop valve shoud be able to make it right.

<< EDIT - Oh yea, since we are talking about a 67 and not a 66, you already have a proportioning (combination) valve, I think the RPVs are in this combination valve.>>