1" or 1 1/8" bore master cylinder ?

[lenguini]

Looking for feedback on this.Im using a disc clip of an early 80's p/u with original drums at the rear.Still using the factory brake pedal.

I have not been able to get a direct answer on this to date.1" or 1 1/8" bore master cylinder ?

Thanks in advance !

Ed.

[lolife99]

I would use 1" bore for manual brakes.
And 1-1/8" bore for power assisted brakes.

This is a good article on brakes.
http://www.popularhotrodding.com/tec...s/viewall.html

[lenguini]

Originally Posted by lolife99

I would use 1" bore for manual brakes.
And 1-1/8" bore for power assisted brakes.

This is a good article on brakes.
http://www.popularhotrodding.com/tec...s/viewall.html

May I ask why you would suggest the 1 1/8" bore for power assist.

Cheers,
Ed.

[lolife99]

Originally Posted by lenguini

May I ask why you would suggest the 1 1/8" bore for power assist.

Cheers,
Ed.

Did you read the link?

Generally speaking, if the master cylinder bore is too large, the driver will feel a very hard pedal feel with minimal pedal travel, and will have a difficult time generating the necessary pressure to effectively operate the brake system.
If the master cylinder bore size is too small, the driver will be able to generate a lot of pressure, but the pedal may have an excessively long stroke or a very spongy feel.
And if the bore size is way too small, the pedal or master cylinder may bottom out before enough volume is pumped to operate the calipers.
The best advice would be to consult with the manufacturer of the brake system you will be using and work with them to pick the right size for your application.
Read more: http://www.popularhotrodding.com/tec...#ixzz2IYuBwgHn

Hard pedal effort with the larger bore M/C will be eased with the use of a power assist booster.

[lenguini]

Originally Posted by lolife99

Did you read the link?

Generally speaking, if the master cylinder bore is too large, the driver will feel a very hard pedal feel with minimal pedal travel, and will have a difficult time generating the necessary pressure to effectively operate the brake system.
If the master cylinder bore size is too small, the driver will be able to generate a lot of pressure, but the pedal may have an excessively long stroke or a very spongy feel.
And if the bore size is way too small, the pedal or master cylinder may bottom out before enough volume is pumped to operate the calipers.
The best advice would be to consult with the manufacturer of the brake system you will be using and work with them to pick the right size for your application.
Read more: http://www.popularhotrodding.com/tec...#ixzz2IYuBwgHn

Hard pedal effort with the larger bore M/C will be eased with the use of a power assist booster.

Thanks for the advise.It make good sense ,so Ill talk to the manufacturer as you suggested.

Cheers,
Ed.

[Captainfab]

In the past I have used a '73-'80 C10 master cylinder with good results. Those have a 1.125" bore for use with power assist.