Wow!!! I'm not sure where to start. I'm not sure what they could have done to cause the exhaust issue. As far as the brakes, again, I have no idea why they would have done anything with the brakes. As far as the engine, what type of fluid is leaking out under the vehicle? Also, you said it smelled like there was burnt coolant in the oil. By chance, is there a creamy tan substance that is mixed into the oil? That could indicate a bad head gasket. See this link:
https://www.2carpros.com/articles/head-gasket-blown-test
If at all possible, record the noise you feel is the timing chain and upload it so I can hear it. Also, let me know what is leaking. Is it coolant, engine oil, transmission fluid, and so on.
Take care,
Joe
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Saturday, March 27th, 2021 AT 10:27 PM