Rear brake not working, foot pedal hard. Opened bleeders on caliper no fluid. Opened union on top of rear master cylinder fluid when pedal pressed, open pipe at ABS unit fluid there too. Open return pipe to caliper at ABS unit no fluid, ignition on no fliuid. Does this look like my ABS pump has gone faulty ? Option A buy another ABS unit. Is option B even possible, put a link pipe to join the two pipes and just have a standard non ABS rear brake ?