HELLO EVERYONE JUST GOT DONE RIPPING HAIR OUT ON 92 FORD F350 WITH DAYTON DUAL PISTON CALIPERS. TRUCK WOULD EXPERIENCE LOW BRAKE PEDAL ANYTIME THE BOOSTER HAD VACUUM, W/O VACUUM TRUCK HAD REASONABLE PEDAL. THROUGHLY CK'D TRUCK FOR LEAKS AND FLUID LOSS ENDED UP... Login to read more.