I did this: Removed one line at the master and installed a plug . Test pedal for travel. Removed second line at master and plugged. Tested pedal, should be rock solid. Reconnected first line disconnected then tested pedal.
I had air trapped in the rear lines so plug and tested it first. Bet you'll see an improvement. I had to buy (about $60.00) a Motive Products power bleeder to get it out. Nothing, and I mean nothing else worked.