new brake behavior Qs

[p00t]

sorry, i hate to double post but im getting no help at the wheel/tire forum.

http://www.nissaninfiniticlub....42669

thanks.

[Q45tech]

You are correct many pad compounds designed to work at hotter temperatures have very poor cold pad performance.

These pads need to be warmed up to 100-150F to have the same friction coeffienct as oem pad do at 40F!

[Q45tech]

http://www.edccorp.com/products/brakedesign.html

In the middle of page is a graph showing how friction varies with temperature and sliding speeds.

Amazing one would buy aftermarket pads [to redesign their braking system] without understanding the physics and securing a graph for the proposed pads vs. oem.

At best some great aftermarket companies copy the friction material curves of the car specific oem pad at worst they use a generic curve for their composition.

95 out of 100 times the oem pads are better for street and single stops from 80 mph!

[Q45tech]

http://www.shotimes.com/brakes/survey/b ... fs/104.pdf

Unfortunately the first test is at 250F [pad edge codes 2nd at 600F] so there is no easily acquired data at 32F or 70F or 100F for that cold first stop!

http://www.nlectc.org/pdffiles...0.pdf

Note that even in the police car test cold pads were at 70F!!!!!!

http://www.akebonobrakes.com/c...h.pdf

Watch out for wear vs. temperature curves and pressure vs friction curves on ceramics!

http://mysite.verizon.net/roma...r.pdf

[p00t]

q45tech thank you for the info!

now i must read :squint