C4 Master Cylinder Size?
Thread Starter
Instructor
Joined: Dec 2007
Posts: 184
Likes: 4
From: Hilliard OH
C4 Master Cylinder Size?
Hey Gang,
I removed the brake booster from my '85. Would like to bump up to a slightly bigger master cylinder to get a little less pedal effort, but don't want to disassemble the stock unit to measure the bore.
Anybody happen to know he bore diameter on the factory units?
Thanks,
BeerMan
I removed the brake booster from my '85. Would like to bump up to a slightly bigger master cylinder to get a little less pedal effort, but don't want to disassemble the stock unit to measure the bore.
Anybody happen to know he bore diameter on the factory units?
Thanks,
BeerMan
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Increasing the MC bore diameter decreases the hydraulic ratio. Brake pedal travel will be reduced however additional force on the pedal will be required to stop the vehicle in a comparible distance.
For less pedal effort the MC bore size will need to be reduced which will increase the hydraulic ratio at the expense of longer pedal travel.
Suggest an 84 MC with bore size .8125 (13/16).
For less pedal effort the MC bore size will need to be reduced which will increase the hydraulic ratio at the expense of longer pedal travel.
Suggest an 84 MC with bore size .8125 (13/16).
Last edited by Churchkey; Apr 17, 2012 at 10:59 AM.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 184
Likes: 4
From: Hilliard OH
Thanks Churchkey. That makes sense. I guess I've been out of school too long, & didn't think it through properly.
I think a little longer pedal travel might be good anyway, cause it would be a little easier to modulate the brakes.
BeerMan
I think a little longer pedal travel might be good anyway, cause it would be a little easier to modulate the brakes.
BeerMan
