Bench bleed problem

[swamp rat]

Bench bleeding the master cyl today the way a friend taught me, Chuck into a vice, plug the ports on the side, put some fluid in the reservoirs grab a philips screwdriver and start pressing the piston in and out till the air bubbles stop.

I noticed today that every time i press the piston inward brake fluid squirts back thru the rear wheel brake reservoir inlet port about 2" high, however the front wheel reservoir inlet port only push's the fluid up about 1/4 to 3/8" high.

First off I have no idea if pushing fluid back thru the reservoir inlet port is normal.

Secondly, before i removed the master i was having trouble bleeding my brakes, i had plenty of fluid to the rear wheel calipers but next to nothing at the front calipers.

Am i doing anything wrong bench bleeding?

Is it normal for the master to squirt fluid back thru the inlet like that ??

I don't mind saying that this is the first time i have had a master and booster replaced so not a lot of experience with it.