I recently replaced the master cylinder in my car because it had very little pedal pressure and was leaking some fluid under the dash. I did not bench bleed the new master cyl i just bled the whole system at the slave cyl. Two days after replacing it, it started to grind when selecting a gear so i bled the system again and it was good for a few more days. On the way to class this morning everything was fine then i left for lunch. Now i can hardly get it into gear and there is a awful grinding when selecting gears. If i shut the car off it shifts fine, if i start it in gear with the clutch in the car lurches forward. Ive read as many threads as i could about bench bleading but never got a straight answer. Im just wondering if the proper way is to bench bleed it first or could i just power bleed from the slave.