"Mxsmanic" wrote in message
Is the parking brake on a large aircraft a separate mechanism from the
regular
brakes, or does it use the same mechanism?

Typically alternate pucks in the calipers will be powered by different
hydraulic systems. The parking brake will use one set of pucks.

Which reminds me ... I once took off from LAX in my 747-400, and after a
bit I
happened to look at the gear page on the EICAS, and it showed all the
brakes
in the yellow range for temperature

Did you retrack the gear into the wheel-wells with elevated temperatures?
That could be a major fire hazard.

D.