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You may have an air directional flow issue. This could be caused by the cables that are connect to the control levers in the dash, and connect to the levers that control the various flaps in the air duct system. These cables my be either unclipped from their respective supports or unhooked altogether (come unhooked) due to the angle they connect at. (hope you know what I mean). Check that out first. If you look up under the dashboard on the passenger side, you should see at least part of these connections.
If you are going to replace the brake shoes, try to purchase ceramic ones. They do make them now for your Canyon. I plan to do just that when I replace my brakes.
First, I have the same squeal in my rear brakes. Yes it is brake dust causing it. But it is only heard on certain braking conditions or after the vehicle has slowed down to almost a stop (with your foot still loading the brake pedal firm). Now I haven't done this as yet, but will be soon enough. I will soon be replacing my brake shoes and pads. I found out that you can purchase ceramic shoes for the rear brakes - which I will be doing. Your truck has ceramic front pads and semi metalic rear shoes.(from the factory) Ceramic pads do not heat up and also do not shed brake dust particles like the asbestos or semi metalic ones do. I don't think you can purchase asbestos brake shoe now, or can you? Anyways, I never use those ones.
I am loosing coolant. I cannot visually see any signs of a leak. The coolant loss takes a long time to show up in the resevoir. The radiator itself is always full. Is the Engine burning it? (small internal leak?)