I had a leaking master cylinder on my 75 that I changed out today. Did everything right, bench blead and then blead the rest of the sytem. Under hard stops the brake light comes on. Pedal feels hard and it's not touching the floor when the light comes on. Could do 10 light stops without the brake light on and then a hard stop (hard enough to lock them up on dirt) and the light comes on again. It was pain to bleed. Plus I blead it again after the first test drive. Even tapped on the prop valve trying to get air from it. After the 2nd bleed job the pedal feel is consistant, solid with not an ouce of sponginess. Brakes stop well, just still turns on the light under really hard panic type stops. So I'm thinking I got a crap master cylinder or got an air bubble in the prop valve or something else I missed. Looking for any suggestions.