Porsche Boxster Owner's Manual page 220

brake fluid changed in accordance with the change
intervals stated in the brochure "Maintenance".
218
Maintenance, Car Care
Warning lights
Warning light USA
Warning light Canada
The brake-fluid warning lights in the instrument
panel and on-board computer indicate:
– brake-fluid level too low,
– in conjunction with large pedal travel, braking-
circuit failure.
If the warning lights should light up when
driving:
Stop immediately in a suitable place.
Do not continue driving. Please have the fault
remedied at your nearest authorized Porsche
dealer.