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General Category >> Rubber Side Down! >> Some advice on greasing brake caliber pins.
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Message started by eau de sauvage on 06/06/17 at 22:53:00

Title: Some advice on greasing brake caliber pins.
Post by eau de sauvage on 06/06/17 at 22:53:00

EDIT: just want to note that I've only just realised that if I spell calliper with only one "l" which is what I did, it is corrected by my spell checker without my realising to 'caliber'. Doh!

Had a look through the brake pad thread but there's a photo missing. Not sure if I should grease the brake caliber pins, the ones behind the rubber boots.

Pressing the callipers they seem to move freely on the pins, so I was thinking of leaving them. I'd freshen the grease if I could work out how to get the boots off but I don't want to force it in case I break the rubber boots.

To grease the pins how do I get the boots off, on the shot with the blue arrow there is a rubber cap boot, then there's a boot what's that about? There isn't one on the other side, it's just solid metal.

On the red arrow, am I supposed to loosen this nut or don't touch it in order to grease the pins.

On the piston shot, there is very light corrosion probably because we rarely ride in the rain, but I'm not sure if it requires a major disassembly to clean this, or if the piston is meant to come right out?

Also when I push the piston back before putting the pads in, how far back should I push it, is it meant to be flush? At the moment I can't push it back any further with my hands, but I'm not even sure if it's meant to be further in anyway. I don't want to put a pad on it and push it in with a G clamp if it's not meant to be in further.

Any advice appreciated.

http://https://s24.postimg.org/fgr2jfyn5/IMG_0875.jpg (https://postimg.org/image/fgr2jfyn5/)

http://https://s24.postimg.org/yoe7g1gyp/IMG_0877.jpg (https://postimg.org/image/yoe7g1gyp/)

http://https://s24.postimg.org/57yldmald/IMG_0876.jpg (https://postimg.org/image/57yldmald/)

Title: Re: Some advice on greasing brake caliber pins.
Post by Dave on 06/07/17 at 01:52:10

Don't unscrew anything....just pull the two pieces apart. The rubber boots will let go and the two pieces will come apart....then you can apply a small amount of grease.

Push the piston back until it is flush with the caliper body....the rubber seal should fold and also be flush.

Make sure you don't have too much brake fluid in the master cylinder as you push the caliper piston back in - as the master cylinder could overflow. (If someone topped up the master cylinder reservoir when the pads were worn and the caliper piston was out.....there could be too much fluid). This is also the perfect time to change the fluid in your brake system!

Title: Re: Some advice on greasing brake caliber pins.
Post by eau de sauvage on 06/07/17 at 02:56:17

@Dave, that's great, it's dark here now but I went out and had a look with a flashlight and I can see the two parts you refer to, I did not twig that it could be pulled apart.

Yeah I will be changing the fluid because it's 2 years old anyway. I've already got a hose attached to the bleed nipple and since I've got 10 times more brake fluid than I need I'll just flush plenty through and use the trick mentioned in the brake pad thread about putting the other end of the hose in the reservoir after the fluid has been flushed completely and let any air bubble out the end of the hose while the submerged hose sucks in more fluid. That's a pretty neat trick.

Regarding the piston, OK so I'll put the old brake pad against it and put a G clamp on it and just screw it down till it retracts fully, that should be fine yeah?

....the rubber seal should fold and also be flush.

Are you referring to a seal on the caliber piston? or are you referring to the boots? I know there is some kind of seal on the piston but I can't see it!

Title: Re: Some advice on greasing brake caliber pins.
Post by Dave on 06/07/17 at 02:59:46

Ooops!......the piston/caliper on this bike doesn't have an outer seal around the piston - nevermind!

Just push the piston back in....I just use a C-clamp and I put a piece of cardboard on the outside of the caliper to keep from leaving a mark on the paint.

Title: Re: Some advice on greasing brake caliber pins.
Post by eau de sauvage on 06/07/17 at 03:21:32

Ha, OK. Finally, I've got some lithium soap based wheel bearing grease with added Molybdenum disulfide that says it will withstand hi temps of disk brakes that should be ok for the pad pins? What about smearing a thin film of grease around the outside of the calliper before it's pushed back in, is that a good thing to do?

Title: Re: Some advice on greasing brake caliber pins.
Post by Dave on 06/07/17 at 03:46:35

I wouldn't put any grease on the piston...it will attract dirt. You could wipe it down with a paper towel with some WD40 on it to clean off any dirt before you push it back in.

Don't overload the caliper pins with grease....they are sealed in rubber and just enough to make things slippery is fine.

Title: Re: Some advice on greasing brake caliber pins.
Post by eau de sauvage on 06/07/17 at 03:52:14

Okie dokie will be looking forward to finishing this tomorrow, I'll see if I can make a video of pulling it apart for the tech section. I'm surprised none of this was mentioned in the brake thread. To a newbie it's not at all obvious that the calliper can be pulled apart to get to the pins.

btw, to give you an idea how much we like to use engine braking, we got 12,000 kms from the OEM pads!

Title: Re: Some advice on greasing brake caliber pins.
Post by Gary_in_NJ on 06/07/17 at 05:09:51

I don't use grease on caliper pins, I use Never-Seize. It's does a much better job of protecting the finish of the pins.

Title: Re: Some advice on greasing brake caliber pins.
Post by piedmontbuckeye on 06/08/17 at 07:09:05

464C48424940444D131511210 wrote:

I don't use grease on caliper pins, I use Never-Seize. It's does a much better job of protecting the finish of the pins.

Ditto!!

Title: Re: Some advice on greasing brake caliber pins.
Post by Andy RN on 06/08/17 at 13:11:25

55475350474143260 wrote:

I'll see if I can make a video of pulling it apart for the tech section.

Please do!

Title: Re: Some advice on greasing brake caliber pins.
Post by Papa Bear on 06/08/17 at 14:58:11

I use Sil-Glyde silicone grease .. it won't deteriorate the rubber.

Title: Re: Some advice on greasing brake caliber pins.
Post by eau de sauvage on 06/08/17 at 21:44:31

@Andy RN, unfortunately I was unable to make the video because I needed the spare pair of hands to help do the work. But it's pretty much as Dave described it it just needs to be pulled apart, the trick is simply to even know that is possible because it's not obvious.

Also cleaned up the back of the piston with WD40 as Dave suggested because unlike the photo, on the other side they were completely black with brake pad soot.

Ended up putting some anti seize on. FFIW I used the Ferodo organic semi sintered Platinum pads which are not squealing at all.