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Old 02-17-2017, 01:41 AM   #1
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About new calipers...

I just installed a brand new caliper. Before I put it on the car, I checked the slider pins. One slid easily, the other didn't move. I had to carefully, with an upside-down screwdriver (handle against the pin) with a folded cloth pad over the end of the pin, hammer it out. It was completely dry, no lube at all. The other side was lubed, but I took it out and added more anyway, after I lubed the dry one. After that they both slid, though the first one slid more easily than the one that had been dry. It'll probably loosen up a little in use.

So it's good to check them. They should be pre-lubed with silicone paste or other non-petroleum lubricant for brake parts, it won't hurt to check, just in case. Glad I did.


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Old 02-17-2017, 07:24 AM   #2
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I'd take a light fine grit to the pin.
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Old 02-17-2017, 09:19 AM   #3
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I always check those pins. I also have like 4-6 extra because I kept melting the seals on the re-manufactured ones from the parts store. I went through a caliper a year for awhile. Resolved the issue by getting SVT brakes.
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Old 02-18-2017, 08:40 PM   #4
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Quote:
Originally Posted by bringler26 View Post
I always check those pins. I also have like 4-6 extra because I kept melting the seals on the re-manufactured ones from the parts store. I went through a caliper a year for awhile. Resolved the issue by getting SVT brakes.
Melting the seals? You mean the rubber pin boots? How? I replaced mine this time, but I bet the ones I pulled off were at least 7-8 years old, and actually were fine, I just replaced them because they were old. They weren't melted or otherwise damaged.

(That was when I rebuilt the caliper, before I broke off the bleeder valve, which necessitated getting a new caliper.)

What are SVT brakes?
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Old 02-18-2017, 08:48 PM   #5
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I'd take a light fine grit to the pin.
If it pulls at all or seems off in any way, I will. Maybe I should anyway, but I'm getting tired of back tracking. Just another chance to screw up something else. Break another part, lose another part...not taking it apart again if I don't have to.
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Old 02-20-2017, 05:10 AM   #6
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X2 post #2, the pin should not drag even dry. The tighter it is the faster it will seize in service. They generally tighten rather than loosen in use. A wee bit of slide in there means the rust has to build up further to lock it up.
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Old 02-20-2017, 08:33 PM   #7
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Thanks for explaining. Sanding it is.
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Old 02-22-2017, 07:25 AM   #8
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Pins should be plated with chrome or similar. Check inside the caliper to make sure there's not rust there. I'd suspect the caliper inner surface before the pin.
That said, as long as they slide smooth and have some grease, I think you'll be okay regardless of which one you put sandpaper to.
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Old 02-23-2017, 03:50 AM   #9
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The caliper isn't rusty. The part the pin was hanging up in was the rubber pin boot. I'm going to take the pin out and scrub it down with super fine steel wool. If it still seems too stiff, I'll swap it out with one of the pins from the old caliper. They're fine, smooth, no rust or pitting, and they were sliding easily.
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