Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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lemon-manuals.org.ua
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ABS Main Relay: Description and Operation
The return pump relay is actuated (with a negative potential) by the
control unit if required, and closes.
As soon as the relay has closed/picked up, battery + (terminal 30), is applied to the return pump, which then runs.
NOTE: The relays cannot be exchanged. When replacement is necessary, the complete hydraulic unit must be replaced.