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      12-28-2016, 09:25 PM   #2
deansbimmer
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Drives: 2011 E93 M3
Join Date: Nov 2014
Location: DFW, Texas

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1988 E30 M3  [0.00]
2006 E46 M3  [0.00]
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If you remove the master cylinder completely then you would need to bleed the system as you would have introduced air into the lines. That isn't necessary however to replace the sensor. If you simply remove the reservoir to gain some room for your hands, then you can just fill the reservoir when you're done. My hands are small enough to reach in to remove the sensor with everything intact, though it does usually tear my arms up a bit.

For the pump, it's an easy swap. Just detach and pull the fender liner forward and you will have access to replace it. Pinch the connector clip to remove the hose and detach/slide upward the pump/bracket assembly to remove it. No need to pinch any hoses or anything. It's just a vacuum hose and the car should obviously be off and on jack stands.
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