Why did you have to bleed the system? If you run the brake pedal all the way to the floor, either during bleeding, running the pistons out after installing new pads, or being surprised by a sudden leak in the system, you are likely to damage the master cylinder. Typically you can pump the pedal to build up some resistance, then it slowly sinks to the floor again when you hold pressure on it.

Answered by caradiodoc (expert)
17,665 answers provided