Hello I just replaced all the pads on my 02 660 and I have no back brakes. To be honest they did not work that well prior. The pistons were pretty stiff to push back (used C clamp). I have manually bleed them and used a vacuum pump. I can only get fluid out of the rear bleed valve. I can not get anything out of the front valve. I removed the line and had very little fluid coming through with each pump. It makes me think the rear master cylinder needs rebuilt/replaced. Any advice is greatly appreciated.

Disclaimer: all this started because I had a fluid leak between the rear brake calliper and the rear differential. I replaced all oil seals on the rear differential.