The braking issue is possibly either a partially seized calliper or a blocked flexible. Suggest that you replace both sides. Most likely I would have thought, to be a partially blocked flexible that inhibits fluid flow to that side and means that the brake on the opposite side starts to work harder, sooner. I assume that you have also checked that the brakes actually release fully on the side that it drifts towards?
Tracking to one side or another 'hands off' could be a range of things. Drift to the left is usually down to road camber in the UK, so drift towards the crown of the road has to be something physically wrong with steering/ suspension. I assume that you have checked for broken springs, etc.? Steering geometry is the obvious place to go, but check your tyre condition and pressures as a starting point.
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