Hydraulic Unit

Two relays are located under the cover of the hydraulic unit. Relay (A7K2) activates the return pump and current flows to the solenoid vows via relay (A7K1).

A diode soldered into the plug socket (13a) controls the ABS malfunction indicator lamp in the instrument cluster when the multipin plug is disconnected from the electronic control unit.

Phased in at the beginning of 1986, the diode is no longer located on the plug socket but in the solenoid valve relays. The new relay has 6 contact pin (previously 5).





In connection with the appropriate relay and fixing clamps the revised design of hydraulic unit can also be installed in vehicles produced earlier. It can be recognized on the outside by the inclined cover with the letters ABS (item A).