What was found
AIRCRAFT WAS NOT GROUNDED: BRAKES PULSATING WITH EVEN MANUAL BRAKE PEDAL PRESSURE FROM 70 KNOTS TO 20 KNOTS. NO INDICATION ON TRIPLE INDICATOR OF FLUCTUATION. MAINTENANCE REPLACED ALL 4 TACHOMETERS PER AMM 32-42-57. MAINTENANCE ALSO FOUND THE SHAFT BENT ON #3 TACHOMETER AND REPLACED IT. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED. SEE AALA202302286089 (#1 TACHOMETER), AALA202302283393 (#2 TACHOMETER), AALA202302287451 (#3 TACHOMETER), AALA202302283206 (#4 TACHOMETER) AND AALA202302289927 (SHAFT)