ABS pressure reduction control function · gf4230p3300a · Mercedes-Benz WIS

GF42.30-P-3300A

ABS pressure reduction control function

10.3.95

MODEL 202 as of 1.9.95,
170, 208 with CODE (470a) Anti-lock braking system (ABS)

P42.30-0224-76

ABS pressure reduction control mode

The ABS control module derives the pressure reduction phase from the wheel speeds and slip values.

The pressure reduction phase is introduced by actuating (opening) the solenoid valves (y7, y9 and y21). The solenoid valves (y6, y8 and y20) remain actuated (closed) in this control phase.

During the pressure reduction phase, brake fluid flows back into the return pump (m1) via the accumulator (11). From there, the return pump delivers the brake fluid in both circuits back to the master brake cylinder against the existing pressure.

There is a silencer (10) in each brake circuit to damp the delivery noise.

b Brake pressure

e Reduced pressure

	ABS normal operation and pressure build up control function	Models 170, 202, 208	GF42.30-P-3100A
	ABS hold pressure control function	Models 170, 202, 208	GF42.30-P-3200A
	Location/task/design/function of ABS hydraulic unit	Models 170, 202, 208	GF42.30-P-4000A
	Location/task/design/function of ABS control module		GF42.30-P-4500A

Referenced documents

gf4230p3100a Normal mode and ABS pressure build-up control function
gf4230p3200a ABS hold pressure control function
gf4230p4000a Location/task/design/function of ABS hydraulic unit
gf4230p4500a Location/task/design/function of ABS control module