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E12, E28, E34, E39, E60General discussion and technical help for all year 5 series cars.
Assuming you don't have air in your lines, you might have a faulty master cylinder. The fluid is probably leaking past the plunger in the cylinder. The pedal stays down because it takes time for the fluid to exit the back side of the plunger and flow back through. Braking can speed up or affect the process because they share the same fluid reservoir. When you launched, did you hold the clutch in longer than usual? That would account for it not happening as often; a typical shift may not be enough time for the fluid to leak through to the wrong side.