Thanks for all the replays. Can someone tell me if you have to bleed the front system if you replace a caliper in the back. The question comes from having a hard time getting the pedal to pump up, even there is no air coming out the back bleeders.
Standard practice is to bleed all points if they need it or not,
DO NOT let the system drain or run the brake reservoir empty, or you will end up with air trapped in your abs pump.
If this happens you will need to connect it up to bmw dis software or inpa and put the abs pump into a service mode to be able to remove the air. Or take a trip to mini or a local place that has software to activate the pump.
Never hearts to give the system a good flush with new clean fluid.
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