Quote:
Originally Posted by SD1too
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
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But this part which you have omitted from your quote
does have a bearing Simon the wording you have replaced with a "......"
that the ABS ECU remains in diagnostic mode, which leads on to this other important omission
Quote:
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Originally Posted by marinabrian
If a "fault condition" occurs, such as failure of one of the primary circuits, the associated shuttle valve will operate to minimise fluid loss, and the ABS ECU will determine an open bleed nipple and loss of pressure on any of the two primary circuits as a fault condition.
This can result in air being trapped in either accumulator which requires a secondary bleed using T4, the symptom of air trapped in this area is commonly described as sinking pedal syndrome.
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So the answer is simple, leave the ignition turned off while you are bleeding the braking system, and you will have 40ml of old fluid left in the system, and no air introduced.
Brian
