+1 on the booster being at fault.

Replacing the rear hoses can be an issue as well, as pressure in the system affects them all.
Used after used caliper makes no sense.

Either rebuild yours, or get remans. Change BOTH as a set, so you dont get uneven braking.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!