Isuzu 1999 RODEO Workshop Manual page 384

Brake Release
At the end of the anti-lock stop, when the brake pedal is
released, the pump will remain running for a short time to
help drain any fluid from the accumulators. As this fluid
returns into the system, the spring forces the piston back
to its original position.
Legend
(1) Brake
(2) Master Cylinder
BRAKE CONTROL SYSTEM
The isolation valve opens and fluid may return to the
master cylinder. Conventional braking is then resumed.
5A–9
C05RW013