These bushings came with the car when I purchased it, new in box. This is the first time they are being installed. I am trying to install them on a new set of calipers. My question lies in the rubber o-ring that you have to insert inside the bushing. Once I insert the ring, the guide pins provided no longer have clearance to slide through the bushing. It is a complete blockage and grease/lube made no difference. Has anyone had this issue?
I've not installed these, however it appears there needs to be grease on the o-ring and guide pin. Then thread the guide pin into the o-ring and probably tap the pin in the remaining distance.
Could remove the o-ring from bushing.
I have had to "ream" or "hone" caliper bushing bore to get them to fit without binding.
I used a strip of emery paper in a very large cotter pin in a drill motor to "hone" the bushings till the caliper slides freely on the pins.
In your case I would remove the o-ring and test fit the caliper/pins and 'adjust' the Bushings as required.
I have seen the results of caliper bind and you don't want to go there.
http://enews.ecstuning.com/q/MCLXY-K...sUQrzUv3-tFkgg
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Last edited by bluptgm3; 09-21-2017 at 08:23 PM.
Interesting S50B32 just uses the pins. No bronze bushing.
I have these bushings.
Yes, the O-rings stick out a bit to far and make it difficult for the guide pin to get past at first. Just force the pins through a few times, either by screwing them into the caliper carriers or by tapping/pressing them through by hand, and it'll grind off the excess o-ring material and move freely enough. Once you can slide them through by hand, clean up the rubber debris on the pin and inside the bore, grease it up, and you should be good to go. I discovered this through trial and error after being confused as to what it was binding up on while trying to screw them in the first time. I just had several hours on the track with mine a couple weeks ago with zero issues.
For grease, I'd suggest a light coating of copper anti-seize as it seems that's what most people use on these, though any high-temp grease should work.
Oh, and make sure you regularly pull the guide pins to clean and re-grease them and the bushings. If it's a street car, at least as often as you change the oil. If it sees the track, clean them before every track day as well. You don't want one of these to seize.
Last edited by TostitoBandito; 09-22-2017 at 06:44 PM.
1999 M3/2/5 - Titanium Silver - Track/Weekend Toy
I ended up not using the o-rings. It’s a track car so I plan on cleaning the pins regularly anyways.
American Grease Stick Co. Sil-Glyde Silicone Brake Lubricant
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As TostitoBandito said, they are a SUPER tight fit with the o rings in place. On my car it took a ton of fidgeting to get everything set up with the o rings/seals/etc.
-James
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