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Old 07-22-2008, 08:05 AM
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"Frozen Wilwood Caliper - Help!"

I have a problem with the aluminum Wilwood caliper on the front of my street rod. When you turn the wheel when it is jacked up, the wheel is hard to turn. It moves but you can tell the caliper is "dragging". The car is not driven very often. In fact, I haven't had it out this summer yet. Anyone have any advice? Help, because I am trying to get to Louisville in it next week!! Thanks in advance

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Old 07-22-2008, 09:03 AM
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It is possible that your fluid may have taken in some moisture, thus corroding the aluminum in the caliper bore, that is- if this is isolated to just one corner.

-or, the brake hose is deteriorating on the inside, keeping residual pressure on that caliper.

If you were to remove the caliper and push in the piston gently and then place it back on the rotor with pads in place and push the brake pedal- (work it a few times) this may free it up.
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Old 07-22-2008, 10:47 AM
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Thanks for the advice. I do have silicone brake fluid in the system if that makes a difference on troubleshooting. However, I will try taking the caliper off and doing as you say. Thanks again.
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Old 07-23-2008, 08:58 AM
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Have you been using the silicone brake fluid all along?
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Old 07-23-2008, 09:41 AM
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I would pull the caliper loose and let in hang. Push the pedal a few times to get those pistons to come out some and clean the corrosion/grit that has probably accumulated. Even though you are using silicone fluid, which reduces the chance of moisture into the system,the pistons and calipers are still different materials and moisture can form around/between the seal and piston because it is moving in and out. That's a common problem on bike calipers because they set for extended periods but the process I suggested usually remedies the issue. Once you start using them again any remaining corrosion will lilely be removed by the heat transfer into the caliper.
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Old 07-23-2008, 10:39 AM
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Yes, I have been using the silicone brake fluid all along. When I called Wilwood, they said to put new o-rings in and clean the pistons good with silicone brake fluid. I have a set of o-rings on its way from Summit as we speak. I've never had them apart so I guess I am going to find out how hard it is to do. Wilwood assures me that it is 15 minute job that an idiot can do. I should be fine!
Thanks everyone for your help. If anyone is considering joining this website, I can tell you that I have gotten more good advice here than any other place over the last few months. It is an asset belonging here if you are any kind of a car enthusiast.
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