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I have used Toyota OEM Pads, and Wagner Thermoquiet Pads, and the O-Reiley house brand BrakeBest, and I honestly cannot tell the difference. I also swapped the Rotors out for the BrakeBest brand a few months ago, and again, I can't tell any difference. They all have been nice and smooth, good grip, no noise, no dust, etc.

I would not swap the OEM calipers out. Instead, have Toyota (or your mechanic) do a clean and lubricate service. I have never replaced the calipers on my Tundra's, but I had an issue last summer with a soft brake pedal that was very difficult to diagnosis and did not act like any brake issue I have ever had. It felt like air in the lines, but that should not have been possible because the level was never low and the system had never been opened, and the pads were in good condition. After replacing the fluid (by bleeding out the old and adding new as it was pumped through the system), I still had the soft pedal issue.

Long story short, the Tundra caliper is a 4 piston caliper and there are an extra set of sliding pins that can get corroded and prevent the calipers from moving properly. In most caliper designs, the sign of the slide pins corroding is that the brakes stick on and you end up with one pad that is worn down to nothing and you have to replace the calipers to fix it. But with the Tundra calipers, when these pins get corroded, they stop the movement of the caliper inward so instead of the brakes getting stuck on, they get stuck pulled away from the rotor and thus the extra pedal travel and soft pedal feel.

I doubt you need new calipers but definitely have the dealer or mechanic do the clean and grease service to all the caliper pins when they put the new pads on. I had newer pads already, so I just had the Toyota brake service done to all 4 calipers and it was about $130 so it was very affordable and it fully restored my brake function.
 
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