Laguna Seca Track Day Brake Issue

dua564

Hi everyone,

I currently have a base, manual 2013 370Z with 18k miles. All I have done to it is replace the tires to wider 275R, 245F Michelin Pilot Super Sports.

The first time I went on a track was in Feb. on stock everything (except tires) to Laguna Seca and I noticed that after running 5 sessions throughout the day, my front brake pads were still great but my rear brake pads were completely worn to the backing plate. This was to the point that the TCS light on my console turned and stayed on. I decided to upgrade my stock OEM pads to something better, EBC Red Stuffs and also upgrade and flush my brake fluid with Motul RBF600. This combination initially felt great and pedal feel was amazing!

However, yesterday I went to Laguna Seca again (having flushed my brake fluid with Motul again and brakes still with a lot of pad left) and noticed that after three sessions, I started getting steering wheel vibrations whenever I braked from high speeds. I also drove the car around the paddock after every session to cool the brakes. Usually for the first 10 mins of every session, I didn't have the vibration issue but it would come back towards the second half to the point it got really violent and make it harder to control the car.

I inspected the car afterwards and noticed that my front pads held up fine and barely weared, however, my rears had again worn down almost close to the backing plate! There was also a lot of black crusty (burnt pad material I believe?) that I found on the wheels.

I was wondering, if the braking power of the car comes from the front:
-why did the rears wear down exponentially faster than the fronts?
-what could be the root cause of the vibration when braking?
-Should I use better (Carbotechs?) next time for track and also have the rotors resurfaced?

Your inputs would be greatly appreciated!

-Nik