I'd mainly look at the calipers. It's possible that one (the right-hand caliper) is sticking.

However, don't stop there. Look at your brake lines too. If the lines are the originals, it's possible that they could be deteriorated inside, causing them not to free-up pressure.

Also, look at your alignment. It's probably a brake issue, but alignment can contribute.

And make sure that if you change one side, change both sides. You shouldn't change (for example) only one caliper.

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Stay the Trail!