Has anybody taken their Z circuit racing with OEM non-Brembo brakes? Ever since then, my brakes started squeaking. Car still brakes fine at least.

 

Make sure they aren't squeeling from the wear markers. If they are, you need to swap your pads. Tracking can take alot off the pads, based on your milage and driving style, it may be that time.

If its the wear indicators, the squeel will be very consistant under braking. If its just squeel off the pads, it will be intermitant based on speed, conditions, etc.

If its just the pads, you take take the pads off, clean everything with brake cleaner, and put some hi-temp grease on the back of the pads and between the shims. The auto-store will have grease for this specific task.