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Showing results for tags 'brake caliper vibration rust'.
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as the weather warmed up, my 2001 OBW started vibrating under braking. like i imagine a warped rotor would feel. in the last couple weeks, however, it's bad enough that i can feel it in the steering wheel and it causes the brake pedal to pulse. so i finally had a peek at it today. i pulled the driver side caliper and rotor and found that the rotor is clean on the outside, but pitted and rusty on the inside. the caliper slides nice and smooth but the pistons are tough to move in. i'm using one of those quick grip type clamps to push the pistons in. they will push out when i press the pedal so they're not completely frozen. the brake pads look the same as far as condition/wear. it doesn't make sense that on a caliper like this, the inside pad would NOT be causing some wear on the inside face of the rotor judging by the smoothness on the outside face. doesn't the inside have to contact in order for the outside to contact? background: had same/similar vibrating issue in winter of '14 after car had been sitting unused for a couple months. turns out rear brakes were completely non-functioning and i assumed all the braking load on the front was causing vibration. braking was very weak too. after replacing pads and rotors and cleaning caliper in the rear, issue was gone. issue returned this year with the warm weather with no other changes to the car as far as other problems. braking otherwise feels fine this time. car does need new axles in the front but no noise, grinding, etc. from that issue aside from play in axle. that doesn't seem to have gotten worse either. not sure if that has anything to do with things. my questions are: should i clean up this caliper and rebuild it, or simply replace it? my instinct is to lube the pistons. i don't want my instincts to get me killed, though. also, are the pistons supposed to move in and out fairly easily or does it require some force? thanks in advance for the help!
