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What do you buy from McMaster?
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<blockquote data-quote="patooyee" data-source="post: 429931" data-attributes="member: 483"><p>I've had that issue before for 2 different reasons.</p><p></p><p>1. The pinion seal housing flange, while relatively flat, is not machined flat, its just cast flat. I've seen some that have enough variation in thickness to where the caliper bracket will bolt on slightly crooked which makes the caliper crooked also. The pads will sometimes chatter back and forth if this is the case. I have always been able to fix the issue by simply putting a washer between the caliper and its bracket on one of the ears.</p><p></p><p>2. Bad / loose pinion bearing will allow the rotor to have play in it which pounds the pads back and forth in the caliper. The only fix for that is replacing the pinion bearings or removing some shims to tighten them up.</p><p></p><p>Before I realized these two issues I tried a residual pressure valve in the system to essentially spring the pads thinking they just needed to stay on the rotor better. This just made my issue worse because the pads would still move with the play in the rotor but now they had some extra pressure clapping them back.</p></blockquote><p></p>
[QUOTE="patooyee, post: 429931, member: 483"] I've had that issue before for 2 different reasons. 1. The pinion seal housing flange, while relatively flat, is not machined flat, its just cast flat. I've seen some that have enough variation in thickness to where the caliper bracket will bolt on slightly crooked which makes the caliper crooked also. The pads will sometimes chatter back and forth if this is the case. I have always been able to fix the issue by simply putting a washer between the caliper and its bracket on one of the ears. 2. Bad / loose pinion bearing will allow the rotor to have play in it which pounds the pads back and forth in the caliper. The only fix for that is replacing the pinion bearings or removing some shims to tighten them up. Before I realized these two issues I tried a residual pressure valve in the system to essentially spring the pads thinking they just needed to stay on the rotor better. This just made my issue worse because the pads would still move with the play in the rotor but now they had some extra pressure clapping them back. [/QUOTE]
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