Quote:

Dividing by 4 brake pads gives you a total of .0041" of movement.



Kevin - this is where modeling the system gets really "fun". Not picking on you or anything, this is the good stuff. All the numbers and ratios and everything you are tossing out there all assume a steady state A/B type ratio. Those numbers are what comes into play when the brake pads are in contact with the rotors and we are slowing down. What is really cool - and may be one of the more important things is what happens before that. The actual travel you have before the pad - or shoe - engages is going to be different front to rear. So you actually have several different states each with a different model. #1 - foot on pedal, no pads touching yet; #2 - first set of pads engage; #3 second set of pads engage. Before contact the pistons in the rear are moving at a different speed than the ones in the front. If we assume the force to get the piston / pads moving is about the same, the front pistons have more leverage and thus less reflected force back into the system. This means you would get considerably more movement on the front and they will engage first, then, as they meet more resistance at the pad rotor interface the slack in the rear would be taken up. Interesting - be nice to go out and slowly press the pedal with someone turning each wheel to see if this is indeed what happens. The only way around this would be separate master cylinders and a balance bar, you could then tune it to your liking.

I feel like a nerd... forgot how much I like this stuff.

Michael Plano, TX 68 Barracuda Notch Pro Patina