I've noticed a thumping sound that increases or decreases with the speed of the car. It's coming from around the front passenger tire. It's most noticeable when I'm slowly taking off from a stop light or if I'm braking. I don't really hear it during regular driving, just stops and starts. I don't know if this has any relation to this problem but I recently had the master cylinder replaced and one of the calipers on the rear brakes.I'm just trying to get an idea of what the problem is and how much the repair might cost before I take it to a mechanic. Thanks!