I have built at least 5 Mars Landers and I second what tbzep said just above.
Robart hinge points are great at their intended usage, but lousy for this application.
Not designed to handle the direction of stress from Mars Lander legs.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !