# Interesting

Posted by MIKE (93VE) on September 08, 2002 at 17:10:56:

In Reply to: Uhhhh, the axle? Since that's where it's turning around, and attached to the moving part of the car. hmmmm. nm posted by Matt on September 08, 2002 at 14:58:42:

To begin with, if I'm being slow in seeing you guys point of view forgive me but this is what a open forum discussion board is about.

But you mention the axle as being the pivot point, isn't the axle part of the steer/susp components instead of a braking system component? I realize the steer/susp system could effect the braking system and visa-versa in a driveability factor but I'm still unclear on how a larger diameter rotor will increase the "clamping force" of the caliper on the rotor if the caliper/pads are kept the same size.

Will you agree on this statement?
The hydraulic pressure behind a caliper piston, times the square area of the piston, times the square area of the pad(s) will equal the psi being exerted on the rotor. If you agree, that means if any factors in the above statement changes it will effect the pressure being applied to the rotor.

The whole idea behind any big brake kit upgrade is to increase the clamping force (pounds per square inch) on the rotor by what ever means neccesary. And since most, if not all big brake kits only involve the caliper, pads and rotor I won't talk about other factors like brake pedal length, master cylinder piston diameter as stated before.

Most big brake kits involve changing the single piston caliper to either a dual or quad piston caliper to increase total square area of the caliper. This is why you and other decided to upgrade your front brakes to quad piston Wilwood, Z brakes, etc.

If you feel you're only repeating yourself, I'll leave it alone and ask a couple of my other associates on their opinion on this matter.

Thanks, MIKE
(The jury is still out)

Replys:

- I would say you're correct as far "clamping force", but thats only part of the "Stopping Force" equation.... mentat (93se 5spd) 18:20:37 9/08/2002 (2)
  - Thank-you MIKE (93VE) 20:26:34 9/08/2002 (1)
    - Yup, you're getting it... mentat (93se 5spd) 10:56:21 9/09/2002 (0)

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: To begin with, if I'm being slow in seeing you guys point of view forgive me but this is what a open forum discussion board is about. : But you mention the axle as being the pivot point, isn't the axle part of the steer/susp components instead of a braking system component? I realize the steer/susp system could effect the braking system and visa-versa in a driveability factor but I'm still unclear on how a larger diameter rotor will increase the "clamping force" of the caliper on the rotor if the caliper/pads are kept the same size. : Will you agree on this statement? : The hydraulic pressure behind a caliper piston, times the square area of the piston, times the square area of the pad(s) will equal the psi being exerted on the rotor. If you agree, that means if any factors in the above statement changes it will effect the pressure being applied to the rotor. : The whole idea behind any big brake kit upgrade is to increase the clamping force (pounds per square inch) on the rotor by what ever means neccesary. And since most, if not all big brake kits only involve the caliper, pads and rotor I won't talk about other factors like brake pedal length, master cylinder piston diameter as stated before. : Most big brake kits involve changing the single piston caliper to either a dual or quad piston caliper to increase total square area of the caliper. This is why you and other decided to upgrade your front brakes to quad piston Wilwood, Z brakes, etc. : If you feel you're only repeating yourself, I'll leave it alone and ask a couple of my other associates on their opinion on this matter. : Thanks, MIKE : (The jury is still out)