Passenger side. Also finished up the entire brake system tonight with bleeding of the system. Previously I had rebuilt the metering valve with the rebuild kit from MCR. First attempt fluid was pouring out of the back of the valve.. I thought great.. Pulled it off tore it apart looked at the orientation of the seal thinking I'd screwed that up.. Nope put it back on and still blowing fluid out the back.. Got to reading the MCR rebuild article online and noticed it said make sure the pocket that the seal sits in is extremely clean. Sooo, back off and torn down and got out the pick and it had a small little piece of rust down in the crevice and threw it back together and back on the car and bingo.. No more leaking and a very firm pedal..