I have an 1997 E300D. I recently replaced the brakes and rotors and decided to replace the old brake fluid. I bleed the brakes until the fluid was clear. I bled each brake however when I dive the car I need to pump the brakes to build up the required pressure to stop the car.

I have bled brakes before and never had this problem. The brake system worked fine before I replaced the parts and cant see how the master cylinder would go bad at this time.

Does anyone have any suggestions? Thanks