I worked in a Canadian Tire when in university, and I buy a lot of my parts there. They are replacement artists. When you go in with a problem, they start replacing parts (at your cost) until the problem goes away, rather than doing proper diagnosis. The only time I use CTC is for E-tests.
A brake job is not difficult, but if you don't have the tools or the inclination to do it, you might be OK going to CTC since you are going in for specific work, rather than asking them to diagnose an issue. Make sure you use their premium pads and rotors, and before you commit to anything ask if there are any sales coming up on brake parts in the near future.
The exhaust is a different matter. If you go into CTC and ask them to see what is wrong with your exhaust, you will end up paying for a whole new system.
In other words, the only time you should use CTC is when you can tell them exactly what parts you want replaced, not when any diagnosis is required.
2001 Bonneville SSEi (retired at 365,000 Kms.)
2014 Jeep Grand Cherokee Overland (yes, I know its not a GM)