The e-brakes pads wear out when the car is tracked or heavily cornered, and is normal.
We remove the pads on the cars we track, to avoid the wear and prevent the e-brake from being welded to the rotor when they are hot parked.
Cracked control arms are very rare.
In the ACR-x cars, we have 99% stock parts and they call for the replacement of the control arms every 250 hours.
Since they are near impossible get, we remove them and have the magnafluxed for cracks.
Not one has needed replacing.
In a wreck with a side hit so hard it shattered the brake rotor, the control arm was not only un-cracked, it was not even bent.
I would insist on seeing the crack and have the control magnafluxed by a third party.
There are many lines on the control arms that resemble cracks but are the casting marks.
More likely you have a bearing issue which sounds like a pop or crack when you go from parked to backing up or from backing up to forward, due to bearing clearance.
This is more pronounced in cars with race alignments and may occur during turning or changing ride height over speed bumps or driveways.
Viper hubs take a terrible beating with the lateral G load and the wide tires.
We replace all four hubs every 9000-12000 miles on the street cars and every 2000 miles on the ACR-X's.
You can get the original Timken hubs at autopartswarehouse.com for around $180 each and cheaper hubs for under $100 each.
We have used both without issue.
You can get used parts from JohnB at Partsrack.com or X2 Builders
http://www.x2builders.com/.
A never raced, never wrecked car should not have a broken control arm.
Not sure who the dealer is, but I would do some real research on this one first.
It sounds like your going to the dentist for a root canal you don't need.
Good luck.
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