Spongy means you still have air in the system, low peddle or having to pump it could be the calipers are not floating very well and the pads have not contacted the rotors OR the master is not big enough for the volume of the slaves.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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