Let’s talk master cylinder size

[Dbotelho]

Purchasing new parts for my new build what is a good master cylinder bore size for floor mount pedals 4 wheel disc brakes 4 piston in the frt. 6 piston in the rear , clutch slave cyl  weddle s4d  any info is appreciated thx

 

[Chingon619]

Clutch is usually a 5/8 for more throw and easier pedal. Same on brakes but have seen some run 3/4 even 7/8 on brakes. The bigger bore is harder pedal less throw, is what I recall. I believe I'm running 3/4s on my brakes. A little hard but fine. Good luck, seems everyone is out having fun. They'll chime in. 

 

[SeanRitchie]

Clutch will require 5/8-3/4.

Smaller = Softer pedal, but longer throw.

Larger = Harder pedal, shorter throw.

For what it's worth, the larger clutch's for the S4D/S5D (10.4" and 11") can actually use upwards of a 7/8" master if desired, and still have a decently soft pedal.

 

[Jtmoney714]

I went 3/4 clutch and 3/4-3/4 on 4 piston fronts and rears. Clutch I like the feel. I think for the brakes I may have preferred 5/8. It feels like I’m pushing a wall. Stops well though. 

 

[John@Outfront]

I went 3/4 clutch and 3/4-3/4 on 4 piston fronts and rears. Clutch I like the feel. I think for the brakes I may have preferred 5/8. It feels like I’m pushing a wall. Stops well though. 

i run all three 5/8 

 

[Jaybird95]

Some manufacturers make a .70 also, if you want to be between 5/8 & 3/4.