If the caliper is in fact hitting the control arm, it would easily cause the knocback the opposite way it does conventionally. Normally there is deflection in the hub which causes the rotor to push the pads back against the caliper pistons. In this situation, the caliper hits the control arm and the caliper housing gets pushed towards the rotor pushing the piston into the caliper bore. Your caliper shouldn't be hitting your control arms. That could turn into a real safety issue.
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Todd
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