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

Registered: 07/06/15
Posts: 20
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?

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

Registered: 08/20/03
Posts: 12405
Loc: NE,Ohio
2017 Jeep Cherokee Trailhawk V6

#4584585 - 11/25/17 02:23 PM Re: Brake grease [Re: mb32]
Yah-Tah-Hey Offline

Registered: 05/26/14
Posts: 3103
Loc: Columbus,Nebraska
Permatex brake grease goop of any color is bad news for pin seals and bushings.Sil-Glyde

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

Registered: 10/03/14
Posts: 1074
Loc: NoVA
Dielectric grease or sil glyde is what I always use.

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

Registered: 09/25/04
Posts: 6728
Loc: 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.

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#4584606 - 11/25/17 02:48 PM Re: Brake grease [Re: mb32]
JTK Offline

Registered: 08/14/03
Posts: 10304
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.
2016 Subaru Forester 2.5, CVT. 2016 Nissan Quest SV (Babe magnet IV)

#4584612 - 11/25/17 02:57 PM Re: Brake grease [Re: mb32]
Timo325 Offline

Registered: 08/31/14
Posts: 334
Loc: AL,NC,TX,Germany,Korea,Italy
2011 Odyssey Touring Elite 80k mi. M1 EP, 0W-20, FU
2008 Mustang GT 81k mi. Edge EP (Gold) 5W-20, FU

#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.

#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.;gclsrc=aw.ds

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

Registered: 10/25/12
Posts: 3815
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.

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

Registered: 10/09/11
Posts: 4962
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...

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

Registered: 03/20/08
Posts: 5606
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

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

Registered: 10/14/16
Posts: 145
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.
~Shade tree mechanic for friends and family.

#4584837 - 11/25/17 07:39 PM Re: Brake grease [Re: Rand]
Donald Offline

Registered: 03/21/04
Posts: 20115
Loc: Upstate NY
Originally Posted By: Rand

2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)

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

Registered: 06/03/02
Posts: 6127
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:

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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