If my memory is correct Tremere clan was created during Dark Ages, and is not one of the original clans, so at that time they weren't really respected by others either, they were somewhat feared, as ages progressed respected for their usefulness in Camarilla goals, but still...
Their ranks shouldn't be any different tho, because they transfered their Mage ranks into their clan, so, those should've stayed the same.
Brujah is completely different, they were closer to True Brujah in their disciplines and the way they acted, they were highly respected warrior-scholar clan. Didn't really research much into modern Brujah, but I doubt they have any ranking structure among themselves, because that would go against their anarchistic nature (which wasn't present in dark ages or didn't present itself as such)