That's not a surprise, my rear right is also VERY heavy, not suprising as I've got the battery, jack, charcoal can, tail pipe, ecu, breather system, air filter, afm, alternator, fog light...which are all absent on the left.
My front right however is particularly light, maybe my screenwash needs a refill?
I measured my braking system on the Arex also, devastating and now on paper, I need a scanner and a new thread..
Matt