First drive after brake upgrade, then - BANG!

No. Suggesting that I'm here to have my *** wiped is childish. Go berate someone else.
My observation is Rusty and Rat have their own demons. Patience is a virtue.
Seems like what you bought is like a new Russian car. I have a friend from Cuba. With the American sanctions, if they could get a new car it came from the CCCP. Under communism people got the same as long as they showed up for work. So cars came with one bolt in the upper door hinge and one in the lower. Engine mount bolts might be finger tight. So the first thing they did with a new car was to take it to a trusted mechanic to be inspected for all bolts in place and properly tightened.
When Chrysler phased out the Gen 2 Sebring, Russian manufacturer GAZ approached Chrysler about rights to all the tooling. Magna Int'l helped relocate the assembly line to just outside Moscow. Engines and electrics were manufactured in Mexico. The plan was for a base model with the 2.0L engine and a loaded model with the 2.4L engine. It was introduced as the Volga Siber in 2008. The plan was for 10,000 cars in the first year, 20,000 in 2009 and 40,000 in 2010. Less than 10,000 were produced in the entire run. The first vehicles were sold to guvment agencies, then to Sberbank employees. The Sebring was not known for reliability here. The poor sales in Russia was blamed on the financial meltdown of 2008, but the Russian population sees poor quality also. At the same time a plethora of European and Japanese models were available.
The older Volga 21 is known in Ukraine as "Russian Mercedes". Thousands of Ladas are used by taxi drivers and private citizens. Moscovitch is recognised as the poorest quality.
Just a FYI tidbit.
Right now Russian tank turrets have more air time than their airforce.