Workshop Manuals Factory service & repair Rover
Rover Rover 600 Repair Manual - Volumes 1 and 2 - 2nd Edition15 · Brakes – ABS BY4
15 · Brakes

Piston/valve

Make
Rover
Model
600 Rover 600 Repair Manual - Volumes 1 and 2 - 2nd Edition
Section
Operation › Piston/valve
Brakes – ABS BY4Piston/valve
Schematic diagram of the ABS BY4 modulator unit showing internal components and fluid passages labeled A through U.
  • A MODULATOR UNIT
  • B Accumulator
  • C Pressure switch
  • D Relief valve
  • E Reservoir
  • F Solenoid valves (3 sets)
  • G Motor
  • H Pump
  • I Piston valve
  • J Sleeve
  • K Piston
  • L Cut valve
  • M to ABS control unit
  • N to right front wheel
  • O to left front wheel
  • P from master cylinder primary piston
  • R from master cylinder secondary piston
  • S to left rear wheel
  • T to right rear wheel
  • U to pump motor relay

Piston/valve

The piston/valve assembly consists of the piston, cut valve and sleeve. There are 4 piston/valve assemblies in the modulator unit to control the brake fluid pressure to each caliper. The piston/valve assemblies for the rear brakes also serve as proportioning control valves to prevent the rear wheels from locking if the ABS malfunctions or when the ABS is not activated.

Solenoid valves

The modulator unit opens and closes the inlet and outlet solenoid valves, and shifts the ABS high – pressure passage according to the signals from the ABS control unit. There are 3 solenoid valve assemblies, each containing an inlet and outlet valve, in the modulator unit; one for each front wheel, and one for both rear wheels. The inlet valves are normally open (open when the coil is not energized), while the outlet valves are normally closed.

Parts & tools for this job For Rover 600

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