DSC Light

I am really enjoying my new toy specially now the weather is great but after a period of use,10 miles/20mins, the DSC light flashes and then turns on with the brake light warning light glowing orange. Today I heard a suspension clunk and the drivers side front brake snatches followed with the warning lights coming on. I understand that the warning light could be the switches on the brake master cylinder or dirty/faulty wheel speed sensors, but what could caused the brake to grab. Help please Daveu

DSC Light