ieplaced my front brake discs and pads about 6 months ago and now after rebuilding the engine over the winter i've started to use it again and i get a judder through the pedal when i brake.The judder appears to be from the drivers side. I have taken the discs off and checked the hubs to make sure they were mounting correctly and i've also had the discs checked for any warping and there was only 2 thou run out. What else could be causing this??

Any ideas