If you clamp off the brake line with a set of locking hose pinching plyers you will not get any air into the ABS/DSC metering module. A proper full system flush requires the OBD2 hookup to cycle the valves in the block, this removes/replaces the fluid in the module.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!