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      08-26-2013, 04:34 PM   #16
Z K
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Drives: E90 M3, G20 M340i
Join Date: Jul 2011
Location: San Francisco

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Quote:
Originally Posted by radiantm3 View Post
Would love to know the right way to do it on our cars. Widening the calipers while the caliper is off the car AND with the bleed screw open seems like an increased chance of something going wrong. With my luck the bleeder bottle hose will pop off and I'll have fluid everywhere.
With a single piston caliper like the stock one, it should be fairly easy to push in with a standard piston pusher tool. Multi-piston calipers, I tend to use c-clamps to push the pistons in. Or your hands if you have a strong grip... The problem with multi-piston is that when you push one of the pistons in, the others move out a bit so you are constantly pushing them one by one until they are all retracted.

Also, the brake fluid needs to be bled afterwards when retracting pistons with the bleeder open to make sure you get out any air that may come in while open.

As for spraying fluid.. can't help you with that one!
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