I installed my new 400E 4pot front calipers on my 87 260E but the brakes are very spongy. I have to put it all the way to the floor for it to even "feel" like it is braking. I replaced rotors + pads + fluid + brake lines...but this is not a bedding in mistake. The brakes are beyond normal for new rotors and pads -- Far, far too spongy.

I figure it is air in the lines and I may need to bleed the brakes again.

I was using a motive power bleeder before...How do I know when to stop bleeding since the fluid is new in there and how can I make sure there is no air? (It was my 1st time bleeding so maybe I made a mistake?)

Any other ideas on why it could be spongy?

Thanks

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k