Quote:
Originally Posted by marinabrian
The ABS ECU runs it's internal return pump briefly on engine startup, and additionally while the ignition is in position 2 without the engine started ...
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It is important for readers to bear in mind that the operation of the return pump described by Brian above will have no effect whatsoever upon the fluid (and air, if present) in the hydraulic circuit from the master cylinder to calipers. This is because the pump is isolated from these circuits by the outlet solenoid valve which is normally closed.
It should therefore not be concluded that this brief operation of the return pump requires the use of T4 in any subsequent bleeding operation.
Simon