brakes are dead, agine

[MasterMan]

alright so a few weeks ago my brakes almost stoped working, so i bled the brakes and the lines were filled with air and evertime i would pump the pedal it would get frothyer, so i replaced the master cyclinder and brake booster... it was working *alright* for about 2 weeks (no where near the orignal brakes but it would stop me) now today i was drivin around with friends, i went to brake tourq my wheels (spin the back tires) and the car wouldnt stay still, it just went forward.. so i stoped and the brakes got really squshy.. so i pull over and check the brake fluid levle and it sucked about half of the fluid out of the master cyclinder (not enough to suck air tho) so i buy some brake fluid and refill it... now my question is... the lines are all metal untill u get to the wheel whells right? (im almost positive because i checked with we did the master cyclinder) none of the hoses were leaking.. so im looseing fluid somewhere... with the main stuff replaced i have no clue as to where it would be going (and possably sucking on air)... i have a 91' 240 with ABS.. im thinking next ill chck the ABS but i dont know.. i really need help cuz im driving around with vary little brake power (no emergecy stops)

thanks for anyhelp

[240canuck]

maybe your pistons at the calipers are leaking look for moisture near the wheels.

[GodDrivesA240sx]

maybe your pistons at the calipers are leaking look for moisture near the wheels.

Yeah, the rubber boot that goes around the piston will tear and let fluid leak out, which also would make it harder to stop with trace amount of fluid on the rotor/pads

[GodDrivesA240sx]

oh yeah.....you can buy a repair kit for them at napa for like 10 dollars. It's kinda easy, just have two people. The hardest part is getting the piston back into the caliper while holding the rubber boot open and also not getting any dirt inside the cylinder.