mx5 Rear big brake question!

Dorimx5 · Postby **Dorimx5** » Tue Mar 22, 2011 9:56 pm

hey guys! i was just wondering if the rear big brake kit for the rear is equipped will it enable the handbrake to lock i know u retain the stock caliper just spaced higher with bigger disc but does it drastically increase braking strenth to the handbrake?

thanks

zossy1 · Postby **zossy1** » Wed Mar 23, 2011 8:52 am

No, not really.

Is your handbrake in a high-intensity usage environment? Autocross? Stunt driving?

project.r.racing · Postby **project.r.racing** » Wed Mar 23, 2011 10:53 am

same caliper = same oem handbrake function. doens't matter if it has moved 10mm further away from the hubs.

braking is increased, but not drastically increase. as the pads are further away from the hubs.

mazdatenfive · Postby **mazdatenfive** » Wed Mar 23, 2011 11:59 am

Is this a case for a hydraulic handbrake system??

PaulF · Postby **PaulF** » Wed Mar 23, 2011 4:08 pm

zossy1 wrote:Is your handbrake in a high-intensity usage environment? Autocross? Stunt driving?

I believe Dorimx5 is building a drift car, so that could certainly provide high-intensity usage.

project.r.racing wrote:same caliper = same oem handbrake function. doens't matter if it has moved 10mm further away from the hubs.

braking is increased, but not drastically increase. as the pads are further away from the hubs.

My basic understanding of physics/mechanical engineering would suggest that the braking torque is basically directly proportional to the distance from the centre of the hub (T = Fd). So a 10% increase in distance from pad to centre of the hub = 10% increase in braking torque. But I imagine there would be other factors which would alter this.

project.r.racing · Postby **project.r.racing** » Wed Mar 23, 2011 5:40 pm

PaulF wrote:
project.r.racing wrote:same caliper = same oem handbrake function. doens't matter if it has moved 10mm further away from the hubs.

braking is increased, but not drastically increase. as the pads are further away from the hubs.

My basic understanding of physics/mechanical engineering would suggest that the braking torque is basically directly proportional to the distance from the centre of the hub (T = Fd). So a 10% increase in distance from pad to centre of the hub = 10% increase in braking torque. But I imagine there would be other factors which would alter this.

yup sounds like you got it right. and yeah there would be other factors as you said.

if building a drift car. id go straight for a hydrulic setup for the rears. a NA8C 250mm rear rotors with hydrulic setup would have far better rear braking than NB8B 276mm rotors on oem handbrake.