Modulator Operation - Honda GL1800 Service Manual

MODULATOR OPERATION

• Pressure DECREASE:
When the ABS control unit detects any tendency towards wheel lock, it rapidly reduces hydraulic pressure to the brake
caliper by rotating the crankshaft to lower the control piston, closing the cut-off valve.
• Pressure HOLD:
Following a predetermined decompression interval, the crankshaft is rotated up slightly to move the control piston into
the pressure hold position, which permits the slipping wheel to recover its rotational speed.
• Pressure INCREASE:
Once the ABS control unit detects full wheel-speed recovery, it rotates the crankshaft back into its highest position. This
rapid cycle of pressure DECREASE, HOLD, and INCREASE makes possible nearly instantaneous correction of changes in
wheel rotation while ensuring highly accurate control of hydraulic pressure to both independent sets of brake caliper
pistons.
BS DE CTIV TED:
MOTOR
From master
cylinder
GE RS
To
caliper
CR NKSH FT
PISTON
Pressure DECRE SE:
B CK-UP
SPRING
Caliper
TECHNICAL FEATURES
Pressure INCRE SE:
Caliper
24-11