Hi

I have just replaced the two pistons in my front calipers and have tried to bleed the system, I used a pressure bleader. The front right went fine, but I got nothing out of the front left. I tried cracking the joints in the brake line all the way back, and have got back to the master cylinder, and there is nothing coming out of the rear of the two lines that come out of it.

Does this mean that the master cylinder is knackered? Did I do something that knackered it while I was replacing the pistons?

Thanks for any help