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Old 10-24-2015, 05:56 PM   #1 (permalink)
Fordiesel
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Grease incompatibility on caliper guide pins?

I pulled out the original caliper guide pins, and noticed the grease was translucent pinkish.

I have a tube of Stalube Synthetic Brake Caliper Grease... which is black in color.

I'm concerned about chemical reactions from mixing grease types.

The 2005 GM factory service manual calls for the guide pins to be lubed with "high temperature SILICONE brake lubricant."

The Stalube tube states that it is made up of synthetic oil based grease, molybdenum disulfide, graphite, and Teflon. The Silicone that GM calls for is not listed as an ingredient in the MSDS of the Stalube or CRC Synthetic Brake Caliper Grease. Likewise, GM doesn't call for molybdenum disulfide for lubricating guide pins.

GM does not offer any guidance on a specific ACDelco lubricant or part number or specification for the guide pins. The closest product I was able to find is GM Part 88862182 (ACDelco 10-4019), called "Silicone Brake Lubricant with Teflon". The only instance I could find where GM specifically recommends this product was to apply it to the backing plate of the pads. Online photos/videos indicate that this lubricant is translucent pinkish, similar to what I found on the original guide pins.

Is it ok to use one of the CRC products without cleaning the bore in which the guide pin sits?

I'm just changing guide pins to a different style. The originals removed quite easily without corrosion. No salt here.

Here are the links to the CRC products that are similar to the Stalube 3301 product I have:

SL3301 -- Synthetic Brake & Caliper Grease, 2.5 Wt Oz

05351 -- Brake Caliper Synthetic Grease, 2.5 Wt Oz

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Last edited by Fordiesel; 10-24-2015 at 05:58 PM.
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Old 10-24-2015, 08:10 PM   #2 (permalink)
GTO_Gregory
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I would say yes, if it is what I think you are talking about.
I have always used just a dab of wheel bearing grease. It has the same flash point of 450-degrees Fahrenheit. But, perhaps you want to post up a picture.
Have you considered telephoning the CRC technical support people. You might also want to telephone some of the brake vendors like Baer or Wilwood. I doubt the dealership service or parts department will be very helpful.

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Old 10-24-2015, 11:11 PM   #3 (permalink)
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Photo of original caliper guide pin grease on tip

Here is the photo you asked for of the lingering original grease on the original guide pin that has never before been removed.

It has a pink colored translucency, which is closer in appearance to the ACDelco Silicone Brake Lubricant than any a synthetic oil with graphite and Moly.

I'm curious about mixing these greases, how they react together when heated from brake operation, and how the combination of the same effects the elastomeric parts like the boots and bushings.
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Old 10-25-2015, 01:29 PM   #4 (permalink)
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Any more guidance on this issue?
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Old 10-25-2015, 03:07 PM   #5 (permalink)
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A search for SL3301 and rubber found this comment by island45 on the ih8mud forum:

Quote:
CRC just called me back. They checked with their chemist on duty and confirmed that their product, SL3301 sta-lube brake caliper synthetic grease is compatible with brake rubber and will not react with it.
Combined with Brian's (heymcall) recommendation of a similar product by CRC (who acquired StaLube), I'm comfortable using the synthetic oil based lubricant with the rubber bushings and boots surrounding the guide pins.

I'm just wondering about any chemical reactions with the OEM lubricant, as a matter of education, and because I don't want to make a turn a small bolt upgrade into a failure prone project of fishing out bushings and destroying new boots in the installation process.

I keep popping up this thread because I'm trying to make a decision by the weekend, and the ACDelco stuff is not available at any dealer near me. (And even if it was, they would want $31 for an 8 oz brush can that I would never possibly use up).
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Old 10-25-2015, 03:37 PM   #6 (permalink)
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I wouldn't be concerned.
Because I would be flushing as much of the OEM grease out as I could. I would try to ensure there was so little residue left, that a possible reaction wouldn't happen.
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Old 10-25-2015, 03:41 PM   #7 (permalink)
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Quote:
Originally Posted by Fordiesel View Post
I keep popping up this thread because I'm trying to make a decision by the weekend, and the ACDelco stuff is not available at any dealer near me. (And even if it was, they would want $31 for an 8 oz brush can that I would never possibly use up).
Are you sure it wouldn't be a $31 squeeze tube that is only enough to do 3 calipers?
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Old 10-25-2015, 03:46 PM   #8 (permalink)
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Quote:
Originally Posted by Diaric View Post
I wouldn't be concerned.
Because I would be flushing as much of the OEM grease out as I could. I would try to ensure there was so little residue left, that a possible reaction wouldn't happen.
I concur.
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Old 10-25-2015, 04:55 PM   #9 (permalink)
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just clean up everything ,and go get any synthetic grease and lube it up ,just make sure the pads slide and the calipers don't bind up
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Old 10-28-2015, 08:25 PM   #10 (permalink)
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I prefer anti seize there

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