I can answer that argument. You never never ever back bleed brakes. The piston seal in the master is a cup type. When back bleeding more times than not the fluid will force lips of seal to pop out in the opposite direction ruining the seal. When installing the master it must be bench bled first before the lines are connected. When everything is connected and master is full open the nearest bleeder, open valve then push pedal down, holding pedal down close off bleeder. Repeat this step until a good stream of fluid comes out than go on to next nearest brake and repeat until all 3 brakes have a good stream of fluid. You have to make sure that master does not go dry or you will have to start all over. Now that you have a good stream of fluid using the 1 pump method you will repeat again but this time pumping the pedal 5 times and holding then bleed off that brake until no sigh of air comes from that line. Repeat this as well for all brakes starting nearest to master to furthest. If done in this manner you will use less fluid and time. Possible that you can have a bad master cyl.
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