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Brake grease #4584567
11/25/17 02:15 PM
11/25/17 02:15 PM
Joined: Jul 2015
Posts: 34
Canada
mb32 Offline OP
mb32  Offline OP
Joined: Jul 2015
Posts: 34
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?

Re: Brake grease [Re: mb32] #4584574
11/25/17 02:18 PM
11/25/17 02:18 PM
Joined: Aug 2003
Posts: 13,138
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,138
NE,Ohio
Sil-glyde


2019 Jeep Cherokee Trailhawk 2.0T
Re: Brake grease [Re: mb32] #4584585
11/25/17 02:23 PM
11/25/17 02:23 PM
Joined: May 2014
Posts: 3,835
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,835
Columbus,Nebraska
Permatex brake grease goop of any color is bad news for pin seals and bushings.Sil-Glyde

Re: Brake grease [Re: mb32] #4584589
11/25/17 02:26 PM
11/25/17 02:26 PM
Joined: Oct 2014
Posts: 1,349
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,349
NoVA
Dielectric grease or sil glyde is what I always use.


yup
Re: Brake grease [Re: mb32] #4584591
11/25/17 02:28 PM
11/25/17 02:28 PM
Joined: Sep 2004
Posts: 7,810
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,810
Marshfield , MA
Sil-glyde. How bad were the boots? Rubber tends to get mushy in petroleum based stuff.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Brake grease [Re: mb32] #4584606
11/25/17 02:48 PM
11/25/17 02:48 PM
Joined: Aug 2003
Posts: 11,013
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,013
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.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: Brake grease [Re: mb32] #4584612
11/25/17 02:57 PM
11/25/17 02:57 PM
Joined: Aug 2014
Posts: 377
DFW
Timo325 Offline
Timo325  Offline
Joined: Aug 2014
Posts: 377
DFW
Sil-glyde


2011 Odyssey Touring Elite 80k mi. M1 EP, 0W-20, FU
2008 Mustang GT 81k mi. Edge EP (Gold) 5W-20, FU

Re: Brake grease [Re: mb32] #4584623
11/25/17 03:12 PM
11/25/17 03:12 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Brake grease [Re: Yah-Tah-Hey] #4584742
11/25/17 05:36 PM
11/25/17 05:36 PM
Joined: Nov 2007
Posts: 1,466
New Jersey
Rock_Hudstone Offline
Rock_Hudstone  Offline
Joined: Nov 2007
Posts: 1,466
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


Re: Brake grease [Re: mb32] #4584794
11/25/17 06:42 PM
11/25/17 06:42 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: Brake grease [Re: mb32] #4584823
11/25/17 07:13 PM
11/25/17 07:13 PM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline
Joined: Oct 2011
Posts: 5,091
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...

Re: Brake grease [Re: mb32] #4584826
11/25/17 07:19 PM
11/25/17 07:19 PM
Joined: Mar 2008
Posts: 7,319
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,319
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

Re: Brake grease [Re: mb32] #4584831
11/25/17 07:28 PM
11/25/17 07:28 PM
Joined: Oct 2016
Posts: 191
MN
ZebRuaj Offline
ZebRuaj  Offline
Joined: Oct 2016
Posts: 191
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.


~Shade tree mechanic for friends and family.
Re: Brake grease [Re: Rand] #4584837
11/25/17 07:39 PM
11/25/17 07:39 PM
Joined: Mar 2004
Posts: 21,108
Upstate NY
Donald Online content
Donald  Online Content
Joined: Mar 2004
Posts: 21,108
Upstate NY
Originally Posted By: Rand
Sil-glyde


+1


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Brake grease [Re: Merkava_4] #4584855
11/25/17 07:56 PM
11/25/17 07:56 PM
Joined: Jun 2002
Posts: 6,439
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,439
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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