After working on my r56 mini cooper rear brake pads replaced, I have brake pedal that sinks when engine starts it feels firm when pumped a few times when engine is off.
And, I have CEL with code P0015 camshaft sensor. Could the code be triggered by vacuum pump issues?

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This post was auto-generated based upon a question asked on our tech article page here: MINI Cooper R56 Camshaft Sensor Replacement (2007-2011) | Pelican Parts DIY Maintenance Article

Not likely. Pedal sinking is not likely vacuum either. That would be hard pedal.

You may have air in the system. Try bleeding your brakes.

- Nick

Is your MINI showing any other symptoms that are unusual? For P0015, it's unrelated to your brake pedal issue. Info here: https://www.obd-codes.com/p0015.

Could be VANOS as P0015 with MINI FC code 0x2D61 is VANOS, exahust: Closed-loop control fault, position not reached. 0x2845 is 'B' camshaft position timing over-retarded (bank 1) and 0x2D60 is VANOS, exhaust: closed-loop control fault, camshaft sticks. Depending on which one you have I've seen VANOS, skipped timing, or camshaft position sensor as the culprit. Report back with your findings!

VANOS article: MINI Cooper R56 VANOS Solenoid Replacement (2007-2011) | Pelican Parts DIY Maintenance Article

The pedal sinking could be a bad master cylinder. I had a similar problem in my old Hondas that was fixed by replacing the master cylinder.

--DD