friends 77 240D, they took it to a corner brake shop, had front calipers and hoses replaced. a few days later while braking, the pedal went all the way to the floor, pumping it restored the brakes. has been happening off and on since then. i told them sounds like a bad MC, maybe the shop incorrectly bled the brakes and overran the seals in the MC... anything else to suspect? could incorrect brake hoses cause this? fluid level is fine and doesnt seem to be disappearing.

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1981 NA 300D 310k miles