Hi all

I have read nearly all threads about bleeding therefore I ask🤯

I have just mounted a new brake booster and has to bleed the brakes.

The MC is new and I think I would  mount all parts together and start bleeding the MC on the car and not on bench.

Should I start bleeding the Rear or the front-line on the MC ?

Just do both at the same time.  Make sure that the MC is tilted upward at the end so that the bubbles will be forced out.  You can do that by leaving the bolts loose or by lifting the front of the car.  The MC bleed screws are at the ends of the stroke you want the the bubbles to rise to that area so that they'll push out.  Both front and rear are actuated at the same time, because they're in the same bore, so you can just run two hoses up in to the reservoirs and pump away.

Yeah, run 2 short hoses from the bleeders up into the reservoirs and pump away.

....you are truly a pair of gents, thanks for help.