Hi there,
They may be referring to the periodical flushing of the brake fluid and the coolant, this is a standard service item the brake fluid should be flushed and re newed as it is hygroscopic, that is it attracts moisture and this moisture in the fluid can case brake fade and if left it can also start to case rust, the coolant also brakes down over a period of time and should also be flushed and re newed, this is not mandatory but it is advisable to have it done.
Mark (mhpautos)
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Thursday, April 9th, 2009 AT 8:42 AM