What was found
RESIDUAL BRAKE FLUID WAS FOUND ON LT BRAKE LINE AND THREADS. WHEN DEPRESSING BRAKE PEDALS, PEDALS FEEL SOFT AND BOTTOM OUT TO THE STOPS, THEN MASTER CAUTION WITH LOW BRAKE PRESSURE ANTISKID INOP ANNUNCIATOR ILLUMINATES. BRAKE FLUID RESERVOIR LEVEL IS GOOD AND BRAKE BYTE INDICATORS DISPLAY GOOD. COULD NOT DUPLICATE IAW DECIDED TO CHANGE LOW PRESSURE SWITCH. REMOVED SUSPECT SWITCH INSTALLED NEW CUSTOMER SUPPLIED SWITCH, BLED SYS. TAXIED ACFT. OPS LEAK AND TAXI CHECK GOOD. WORK DONE IAW MM CHAPTERS 32-42-06 AND 32-44-00.