dual port master

i need to find a dual port master desinged for a car with power brakes and 4 wheel drum brakes anyone have any ideas thanks guys

 

Late 60's early 70's Chevy's with your description will work. Like 69 Chevelle, Nova, Camaro with all drum power brakes.

 

You really need to check to get the right diameter for each seperate installation as they are different.

 

I used a dualport M/C and power booster from Pirate Jacks for my Caddy with drums all around. Really good customer service.

 

i agree witk krylon, dogpatch just installed a 1 1/8 bore and its like a rock, being resleeved to smaller size now.

 

the car is a 58 edsel that someone put a boster on with what looks like a vete master the car has a very hard brake pedel with very little movement a guy from mp brakes told me the master bore is to big

 

Have you taken it off to see what bore it is ?

 

1 inch

 

Take a read on our reply to matt2491 on his corvette m/cyl. it also applies to your problem.

 

woldnt the need of a rpv give a pedel you need to pump

 

Thats why its so hard. General rule 1" bore for manual brakes and 1 1/8" bore for power brakes.

 

power brakes always do have smaller diamter bore....

 

Perhaps something was lost in translation, or its a metric thing. But by the 60s, the automakers all settled on 1" manual or 1 1/8" power master cylinders. Then the cars got smaller and all the rules changed. But for what we do, this is a good start.

 

I may be wrong and im no rocket scientist but i think its the opposite, manual brakes have the smaller bore

 

Yup, the smaller bore gives more line pressure but less volume.

I could post up the math on the hydraulic principles involved but it's morning and I have to go to work.

Try google if you need more info. I found some really good stuff on a couple of the aftermarket brake company websites.

Shawn