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Thread: Brake grease for caliper pin inside rubber boot?

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Posts: 1-9 of 9
2016-05-22 20:23:58
#1
Brake grease for caliper pin inside rubber boot?
Hey all. I did a partial rebuild on my AD22VF calipers today. I picked up a pin boot kit at AutoZone, special order since they aren't stocked, Duralast brand. The piston boots were in good shape, but the slide pins had so much dried out lube I'd never have gotten it cleared out of those rubber boots, so it was best to replace them.

I have been using Sil-glyde for the pins on other brakes, but this doesn't seem to work well within the rubber boots, not slick enough, and the pins just don't seem to slide that well, too much friction. For the pin that isn't sliding in a rubber boot, slides great.

I know with the official Nissan kit there is a special lube for the rubber parts, does anyone know something off the shelf that would work well in this area?
2016-05-22 20:43:06
#2
I hVent had bad luck with any off the shelf brands
2016-05-24 23:42:36
#3
Well, like I said, I had originally tried AGS brand Sil-Glyde:



The slider that goes in the rubber sheath just didn't slide that well at all. It seemed to take quite a bit of force to move it in and out, rotation of the bolt was fine. But since it has to move back and forth, the amount of friction I was having didn't seem good.

On the recommendation of another forum member, I gave Permatex 09973 a try, advertised as a Ceramic Brake Lubricant, good for slide pins and safe on rubber parts:



While this lube does seem to slide a bit better than the Sil Glyde, I'm still not terribly happy with now well the pin slides.


I called the local Nissan dealer, they do not sell the red lube that comes with the caliper rebuild kits separately, and the parts guy chatted with a service guy, who said that they don't even use the red stuff in the back, as they don't rebuild the calipers. I didn't bother to mention that these parts are supposed to be lubed at each service...

I did more googling on red rubber grease, but apparently these products aren't sold in the US anymore?

The search continues...
2016-05-25 01:04:27
#4
Just like blue brake fluid I suppose, we aren't allowed red brake grease anymore. This world has gone to hell with color perverted segregation in our automotive fluids.

If you want them to slide the best, ditch them all together and get a four piston setup. Win-win!
2016-05-25 18:57:22
#5
Originally Posted by Kyle
Just like blue brake fluid I suppose, we aren't allowed red brake grease anymore. This world has gone to hell with color perverted segregation in our automotive fluids.

If you want them to slide the best, ditch them all together and get a four piston setup. Win-win!


If I knew of a car at the local salvage yard that I could get these from that would fit the B13, I would. LOL

OK, more information that I've been able to dig up. The official Nissan stuff is part # 99990-00939, a 16oz tub for about $40. Courtesy Nissan showed this as discontinued, but after I emailed them they said it was a mistake, and fixed their web site, new part # is now showing as 99990-00939P, and is described as PBC Grease (Poly Butyl Cuprysil). I'm not wanting to pay $40 just to see if this stuff slides any better than what I have now, I may drop by the service bay this weekend and see if I can get a tech to get me a sample if I can confirm this is what they are using.

I've also found what seems to be a similar Toyota part #, 08887-01206, described as Lithium Soap Base Glycol Rubber Grease. Definitely not the same compound that Nissan uses, and it may not stand up to heat well, if this video is to be believed, seems to only be good to about 150 Celsius, or 302F:

2016-05-25 20:57:16
#6
I have had good luck with the permatex purple stuff you pictured.Track days ,too,but no racing just HPDE
I am also curious about the Nissan stuff so.....subscribed!
2016-05-25 21:28:57
#7
I bet Nissan will have some grease from AutoZone
2016-05-31 14:10:30
#8
I use sil-glyde religiously now. I used to use just what ever grease I had on hand, then one day 200 some miles form home I feel my Legacy started to brake on the highway and awful brake smell. So here I am at the nearest Advance Auto asking them for slide pin grease, they are dumbfounded thinking it's the same as any other grease. Bought some lucas oil grease, regreased the pins in the parking lot and got got home fine until they locked up again.

The problem is the slide pins have a rubber sleeve inside of it, I checked and my G20 has them too. Non Sil-glyde grease causes that rubber sleeve to expand and lock up. You can see by how much in this picture. Oh another thing I noticed is, the dust boot also was was bigger then it should be, thus no longer sealing moisture out.


Since I think the rubber sleeves are stupid, I replaced all of my caliper guide pins to be the pins that don't have provisions for the sleeves, but honestly you can just remove the sleeve and run it as is. Since I did that, and still am using sil-glyde, my pins are moving freely to this day couple years later.

I think your running into the same issue, so you should just pull the rubber sleeves out (if your car has them), clean the guide pins and the holes really well and fill it with new sil-glyde along with new rubber boots (stupid cheap on rock auto). Then it should glide freely.
2016-06-01 22:43:03
#9
I've been using the Permatex (purple) synthetic brake lubricant for a number of years now and I've never had an issue. I use it for other things as well (non-automotive) and it always does the job.

I agree with ditching the inner sleevs as well. My G20 is sans sleeves.
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