Gday Jim,jimcroisdale wrote: ↑Tue Apr 03, 2018 12:43 pmHi all,
Building a brake system on a gravity racer using a balance bar style setup. Original master cylinders didn't have enough volume to move the calipers enough, so we are buying new ones and dropping them in. The new master cylinders are Wilwood types with 0.75in bore. Here's my maths. Does it look right to you?
Max gap between pads at rest - 4mm
Disc thickness - 2.5mm
Distance to move before pads clamp onto disc - 1.5mm
Piston diameter - 30mm
Volume required to move ONE piston 1.5mm is 1060mm cubed
Now the Master Cylinder:
Bore - 19mm
Stroke - 35.6mm
Displacement - 10,093 mm cubed.
So TWO calipers will need 2120mm cubed, and the master cylinder can provide 5x that. Should be fine? Will account for brake wear etc etc no problem?