So as the title says my disc brakes are not locking up. They are gripping but not locking. My older brakes were leaking and i changed them with Shimano Deore BL-M596. I have searched online and found some things about pads. I checked for any contamination on my pads and my rotor but they seem to be fine. No oil or anything. How do i get them to lock? Thanks!
New brakes need to be "bed-in" (not bled), with their rotors: Get up to speed, then drag the brake for 5-6 seconds (builds up heat) and then increase lever pressure until the bike stops. Do this about 10 times.
More on bedding-in brakes here: http://www.bikeradar.com/us/gear/article/how-to-bed-in-disc-brake-pads-31337/