New Brakes, now no brakes

Had new brakes ( old rotors re turned ) put on a 94 Rodeo 2000 miles ago, they worked OK till now, now hear a clunk under the dash when applying brakes (pedal seems intact and not sloppy), but I have to pump about 3 times
to get stopped, what might the problem be? Thanks JMC
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sounds like it could be the master brake cylinder.

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