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#4584567 - 11/25/17 02:15 PM Brake grease
mb32 Offline


Registered: 07/06/15
Posts: 30
Loc: Canada
I'm doing the front brakes on my 06 G35. After finishing up I went to flush the brakes and noticed that the rear caliper slide boots were completely shrunken.

I was fortunately able to get the pins out but it was obvious all the grease had escaped.

I did the rear brakes 2.5 years ago and used Permatex synthetic disc brake lube (green colour). I obviously want to clean everything up, replace the boots and get new grease on the pins and clean off what I just applied to the front.

Any recommendations on what grease to get use that won't kill the rubber?

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#4584574 - 11/25/17 02:18 PM Re: Brake grease [Re: mb32]
Rand Offline


Registered: 08/20/03
Posts: 12650
Loc: NE,Ohio
Sil-glyde
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#4584585 - 11/25/17 02:23 PM Re: Brake grease [Re: mb32]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3409
Loc: Columbus,Nebraska
Permatex brake grease goop of any color is bad news for pin seals and bushings.Sil-Glyde

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#4584589 - 11/25/17 02:26 PM Re: Brake grease [Re: mb32]
Jimzz Offline


Registered: 10/03/14
Posts: 1147
Loc: NoVA
Dielectric grease or sil glyde is what I always use.
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yup

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#4584591 - 11/25/17 02:28 PM Re: Brake grease [Re: mb32]
andyd Online   content


Registered: 09/25/04
Posts: 7153
Loc: Marshfield , MA
Sil-glyde. How bad were the boots? Rubber tends to get mushy in petroleum based stuff.
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#4584606 - 11/25/17 02:48 PM Re: Brake grease [Re: mb32]
JTK Offline


Registered: 08/14/03
Posts: 10587
Loc: Buffalo, NY
I've made the same mistake and had similar results in the past.

All those different flavor "caliper greases" are super misleading IMO. They're more for the pad ears and backings and not so much for the rubber areas. I too use Sil Glyde for those and still have an expensive jar of purple "synthetic" caliper grease that is real sticky and stringy that I barely use.
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#4584612 - 11/25/17 02:57 PM Re: Brake grease [Re: mb32]
Timo325 Offline


Registered: 08/31/14
Posts: 338
Loc: AL,NC,TX,Germany,Korea,Italy
Sil-glyde
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#4584623 - 11/25/17 03:12 PM Re: Brake grease [Re: mb32]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
I used Dow Corning 111 on the slide pins the last time I did brakes; only because that's what I had on hand at the time. It's a high viscosity silicone grease used to lubricate plastic water softener valves and o-rings. It seems to be working OK. It's probably similar to Sil-glyde.

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#4584742 - 11/25/17 05:36 PM Re: Brake grease [Re: Yah-Tah-Hey]
Rock_Hudstone Offline


Registered: 11/13/07
Posts: 1449
Loc: New Jersey
Originally Posted By: HosteenJorje
Permatex brake grease goop of any color is bad news for pin seals and bushings.Sil-Glyde


Right. There is nothing "Perma" about Permatex brake grease, that stuff never failed to dry out and disappear within a few months.

Nothing but Sil-Glyde now for me. The 3M silicone paste is good as well but pricey.

https://shop.advanceautoparts.com/p/amer...mp;gclsrc=aw.ds


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#4584794 - 11/25/17 06:42 PM Re: Brake grease [Re: mb32]
Ducked Offline


Registered: 10/25/12
Posts: 4369
Loc: Taiwan
I have some silicon grease, and some red rubber grease, bought in Japan, and some Bendix Ceramlube, bought in Australia.

So far I've only used the silicon. Since it didnt have a very high temp spec I backed it up by wrapping the pins in teflon tape. Been OK so far but I'll probably remove that the next time I strip them.

Dunno whats in the (recommended?) red rubber grease but IIRC the "traditional" Castrol equivalent was a castor oil/bentonite base, so it should be fairly rubber compatible but might eventually harden in service.

On paper the Bendix stuff should be the best but its pretty expensive.

The only readily available rubber compatible grease in Taiwan is earwax, and there isn't much of that.

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#4584823 - 11/25/17 07:13 PM Re: Brake grease [Re: mb32]
NHGUY Offline


Registered: 10/09/11
Posts: 5044
Loc: USA
King Kaliper/BBB Industries only uses a SilGlyde type lube in its assembled brake calipers...the previous Massachusetts owner of the King brand also only used the same product.And they had been around for 25+ years...

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#4584826 - 11/25/17 07:19 PM Re: Brake grease [Re: mb32]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6174
Loc: USA
I usually use whatever grease comes with the pads, and the last time I did rear brakes, I got new calipers anyway, which cane with the slide pins pre-greased hide

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#4584831 - 11/25/17 07:28 PM Re: Brake grease [Re: mb32]
ZebRuaj Offline


Registered: 10/14/16
Posts: 153
Loc: MN
I use Permatex Extreme purple goo on all the contact points and shims, but only 3M silicone paste on slide pins and boots.

Too many horror stories of anything but silicone on rubber components.
_________________________
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#4584837 - 11/25/17 07:39 PM Re: Brake grease [Re: Rand]
Donald Online   content


Registered: 03/21/04
Posts: 20461
Loc: Upstate NY
Originally Posted By: Rand
Sil-glyde


+1
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#4584855 - 11/25/17 07:56 PM Re: Brake grease [Re: Merkava_4]
doitmyself Offline


Registered: 06/03/02
Posts: 6221
Loc: MI
Originally Posted By: Merkava_4
I used Dow Corning 111 on the slide pins the last time I did brakes; only because that's what I had on hand at the time. It's a high viscosity silicone grease used to lubricate plastic water softener valves and o-rings. It seems to be working OK. It's probably similar to Sil-glyde.

Pay attention in class, Merk. Very little about Sil-Glyde is similar to 111 grin:

Sil-Glyde:
1. Polypropylene Glycol 25322-69-4 45-60%
2. Castor Oil 8001-79-4 30-45%
3. Silicon Dioxide, Amorphouse (silica) 7631-86-9 5-15%
4. Polydimethylsiloxane (silicone) 63148-62-9 1-5%
5. Oleoyl Sarcosine 110-25-8 1-5%


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