Pedal Struck Road Surface

While cycling at Taman Mutiara and negotiating a sharp right corner, I noticed a car (silver Viva) coming very fast in the opposite direction. I pressed the rear brake, and suddenly I felt a grinding sound from my rear tire. I thought that the tire skidded. Only when back home that I realized that my left pedal struck the road surface. The long crank arm 172.5mm did help.  it didn't throw me off but took a fair bit of the carbon off the Look Keo blade pedal. Lucky that the blade is still intact.
*** Always REMEMBER this:   KEEP THE INSIDE PEDAL UP while cornering