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diy
Joined: 14 Sep 2009
Posts: 367
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 Posted Mon Nov 16, 2009 2:00 pm |
I changed my pads over at the weekend - put my superstars in - they are pretty good, although they are chunky, so It was hard work riding on sunday as the front and rear are touching despite the pistons being pushed home.. Anyway I tried the dollup of grease on the back while fitting as a general maintenance tip and have to say its really risky given the likelihood that you might not get the pads home first time and risk getting grease on surface.
I found a better way of doing it.
Insert pads dry, put a little copper grease in a medicine syringe, tilt the pad forward to reveal the back (while fitted) and squirt a tiny amount on the back - much safer.
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nicklouseLives Here
Joined: 20 Mar 2003
Posts: 48211
Location: A Yorkshire man in Sweden
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jonnyc2420
Joined: 24 Aug 2009
Posts: 43
Location: somerset - in sight of the quantocks...
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diy
Joined: 14 Sep 2009
Posts: 367
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Posted Mon Nov 16, 2009 2:30 pm |
| nicklouse wrote: | | or just have your brakes set up correctly. |
This was more a "while I was at it" type application. I don't actually have a problem to fix (other than needing new pads which is why i changed them) However, copper grease on the back of motorbike brakes is usually recommended, and some people here have suggested it.
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robertpb
Joined: 14 Aug 2008
Posts: 441
Location: Cranham Essex
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Posted Mon Nov 16, 2009 5:45 pm |
This sounds dodgy to me as the grease can melt, then track all over your pads.
If you get the pistons right the way back there should not be a problem with the Superstar pads.
Now where's that "Get Out of Crash Free Card" |
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ride_whenever
Joined: 17 Oct 2006
Posts: 8263
Location: United Kingdom
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Posted Mon Nov 16, 2009 7:10 pm |
Oh FFS...
huge thread on this about a week ago.
It's a bad idea, mtb brakes don't get hot enough to drive the grease out of the pads, it will get washed in to some extent.
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456!
silly little bike |
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dave_hill
Joined: 16 Oct 2007
Posts: 3638
Location: Burnley, Lancs.
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Bignige
Joined: 10 Aug 2009
Posts: 42
Location: Southwater, West Sussex
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Posted Mon Nov 16, 2009 9:48 pm |
Copaslip should never ever be used on brake systems as it has a very low melting point and WILL contaminate the pads !!!!!!!!!
Ride it like you stole it.........Yeah Baby!!!
08 Spesh Enduro SL Expert |
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robertpb
Joined: 14 Aug 2008
Posts: 441
Location: Cranham Essex
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Posted Mon Nov 16, 2009 11:56 pm |
Grease melts at 120 to 220 C depending on type, 220 is high temp type.
Brake pads can easily exceed 200 C, in fact some are designed for 800 C.
So brakes + grease = bad idea.
Now where's that "Get Out of Crash Free Card" |
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Bignige
Joined: 10 Aug 2009
Posts: 42
Location: Southwater, West Sussex
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Posted Tue Nov 17, 2009 12:08 am |
| robertpb wrote: | Grease melts at 120 to 220 C depending on type, 220 is high temp type.
Brake pads can easily exceed 200 C, in fact some are designed for 800 C.
So brakes + grease = bad idea. |
+1 On that.......Having spent many a happy (not!!) hour with automotive brake engineers from Bosch as part of my job I can confirm that they nearly cry whenever we go and inspect a defective brake system and find it plastered with grease for the reasons given by robertpb!!
Ride it like you stole it.........Yeah Baby!!!
08 Spesh Enduro SL Expert |
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ride_whenever
Joined: 17 Oct 2006
Posts: 8263
Location: United Kingdom
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Posted Tue Nov 17, 2009 12:24 am |
Not to mention hope say not to do it...
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456!
silly little bike |
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ride_whenever
Joined: 17 Oct 2006
Posts: 8263
Location: United Kingdom
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Posted Tue Nov 17, 2009 12:26 am |
I would suggest cleaning the pistons to the OP.
For everyone else, squealing is stopped by copaslip because it contaminated the pads to some degree one way or another.
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456!
silly little bike |
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dave_hill
Joined: 16 Oct 2007
Posts: 3638
Location: Burnley, Lancs.
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Posted Tue Nov 17, 2009 7:41 am |
| Bignige wrote: | | Copaslip should never ever be used on brake systems as it has a very low melting point and WILL contaminate the pads !!!!!!!!! |
Er, actually Copaslip resists temperatures up to 1100°C, according to the manufacturer's data...link here
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Bignige
Joined: 10 Aug 2009
Posts: 42
Location: Southwater, West Sussex
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Posted Tue Nov 17, 2009 3:34 pm |
| dave_hill wrote: | | Bignige wrote: | | Copaslip should never ever be used on brake systems as it has a very low melting point and WILL contaminate the pads !!!!!!!!! |
Er, actually Copaslip resists temperatures up to 1100°C, according to the manufacturer's data...link here |
My mistake dave_hill, just spoken to the Bosch guys who said the problem is that the viscosity is not very stable at temperatures above 100 C so it tends to spread onto the friction surface very quickly!
Ride it like you stole it.........Yeah Baby!!!
08 Spesh Enduro SL Expert |
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supersonicLives Here
Joined: 25 Nov 2005
Posts: 48007
Location: Chapeltown, Sheffield
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Posted Tue Nov 17, 2009 4:54 pm |
If you do do it, we are talking about a very small dab of the stuff, and certainly not on pads with holes in the back of them.
There are other greases that are thermally stable to well over 500 degrees.
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Zaskar Carbon Team
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