09-20-2021, 07:43 AM
Worn brake pads seat themselves into the minute grooves of the disc, and thus have the greatest contact area. Changing to new pads means they have to bed into those grooves and wear down the peaks, so thus have less contact area, and require more effort for the same amount of stopping.
This also depends on different pad compounds from different manufacturers. All this may be normal, including the noise, as Tev62 stated previously.
While it seldom hurts to bleed the brakes (correctly, that is) it is probably not the cause. However, because you have to push the pistons into the caliper to make space for the thicker pads, the square-section o-rings are now sweeping a different area of the pistons, an area that had been more exposed to dirt/corrosion, as Max says.
This also depends on different pad compounds from different manufacturers. All this may be normal, including the noise, as Tev62 stated previously.
While it seldom hurts to bleed the brakes (correctly, that is) it is probably not the cause. However, because you have to push the pistons into the caliper to make space for the thicker pads, the square-section o-rings are now sweeping a different area of the pistons, an area that had been more exposed to dirt/corrosion, as Max says.