Brother replaced all 4 corners pads and rotors. Bled the system with new fluid. Everything was OK for the first few days now the pedal starts out firm but I can push it to the floor. Replaced the master cylinder with a new TRW one and the same thing. I'm thinking air in the system but my brother says no arguing that air would give a spongy feel not a firm feel. Would an ABS pump cause this? No indication of a fluid leak at the master or any of the calipers. The car stops straight so no indication of a frozen caliper.

He bled it the old fashioned way with a person on the pedal and arson cracking the bled screw. I told him to get a pressure bleeder and it will be so much easier and no chance of sucking air.

Any ideas?

Thanks

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