Yeah, well mine does drop when I pump it up and switch the motor on. Maybe sitting around and not being used for the past 6 years has caused the callipers to harden up. Maybe I need to just put some heat into it again and see if they free up some. I have more than enough things to fix currently such a pain. You'd think it'd be working perfectly by now.
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Ongoing Project: 1972 Datsun 510 S13 SR20Det.
http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18