Which master cylinder for Cheby disc conversion

[broncoP]

I did the chevy/ford disc brake conversion on a dana 30. I used a 76/77 master, my buddy thinks it's the wrong one and he's probably right. Which master should be used

 

[bronconut73]

Nah...It's fine...
You could get a slightly larger bore and it "may" help but go too big and you'll increase your pedal effort.
Stick with what you got Bud.

 

[Apogee]

The 1" bore Ford master cylinder should work fine. The only real difference between the Ford an GM calipers is a 1/16" in caliper piston diameter, so the GM calipers have about 3% more piston area. A 1/16" change in MC bore size will equate to about 11% difference in pressure/volume ratio.

If you like a lighter pedal effort with more pedal travel, go with a smaller bore. If you prefer a harder pedal with less pedal travel, use a larger bore MC. If you like your current pedal feel/travel, but wish you had more brake torque, run a higher CoF brake pad compound.

 

[RODRIG3911]

I used a corvette MC. I believe it was from a 1978 or so Vette and I love the feel of the brakes. Astro van Master Cylinder was too sensitive

 

[Broncobowsher]

Found the normal 1" bore fairly good. Later went to 15/16" bore and liked it better. Of course nothing compares once you go hyroboost.

I fell for the you need a bigger bore maser with disk brakes when I first put the chevy brakes on. Pedal had no stroke and was hard as a rock. Lots of leg pressure needed. It was purely a pressure based system with no travel.

 

[Skiddy]

I did the chevy/ford disc brake conversion on a dana 30. I used a 76/77 master, my buddy thinks it's the wrong one and he's probably right. Which master should be used

so your buddy don't like cheby parts on a ford;D but the cheby brakes are not made by gm anyway

 

[Vin218]

Went through this a while back and found lots of different opinions. Plenty of people used the stock one, I went with one that has a 1 1/16" bore which is just a little bigger than stock and gives a slightly firmer pedal. Its worked great for me so far, can find the part # if you want it.