Quote:
Originally Posted by hugo_nz
Yeah BMW and Mercedes for the longest time used hydraulics to open and close the trunk. Nowadays it's a much simpler system. A spring is often used to "spring" the trunk fully open and then an electric actuator is used to close it. Much simpler and less costly to repair if it fails (plenty of horror stories around of the hydraulic lines rupturing)
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I assume they still use hydraulics on the convertibles because there is no room for those big hinges and springs. What the hydraulics accomplished was auto closing. True they could rupture, but compared to all the other hydraulics lines a convertible has those were not a big issue.