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Brake caliper pin problem.

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Mike H View Drop Down
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    Posted: 26 Feb 2019 at 22:17
Originally posted by TheWrongTrousers TheWrongTrousers wrote:

Never. 

Ditto.

Originally posted by iansoady iansoady wrote:

I must admit those C clips don't look as if they do very much. I'd rather have some sort of positive location.


Interesting, I've always had to use a hammer and drift on all of mine to get them out then back in again. In other words, foooking tight.

Yep BMW also used the P8, my R80 had them too.

And ditto tight pins. Big smile


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 22:02
The bike in question will probably be put up for sale in the next few months and so although I'd be happy to wire the pins in as per jpc's pictures if the bike was for my use, I still think that I will look at getting it bushed or as also suggested by jpc, ask my friend thinks it would be easier to turn a new pin. That may be another option. 
I agree that the spring clip does play a significant part in keeping the pins in place. 
 
 
On top of that I have Ducati paddy and BMW Motorworks and even Gutsibits to ask if they have any 2nd hand calipers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 20:28
Should be a standard P8 calliper.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 19:35
Are they not the same caliper as fitted to BMW airheads and others  , (I'm assuming  they have the same piston dia and mounting bolt spacing .  Plenty of good ones available from the likes of Motorworks?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 17:01
It's the leaf spring between the pads that holds the pins, not the c-clips.
If the pins REALLY rattle, why not drill at 7mm and have someone turn oversize pins, problem solved.

I think Eddie Lawson famously had a crash after the pads dropped out, and some mechanic was let go, and I mean FIRED !!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris950s Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 16:56
Mine are stainless steel and come out a treat, but only when tapped with a small hammer and then wrestled out with a pair of pliers. Center pins are stainless too. All supplied by Shaw Stainless 


I can't remember where I got the springs from, but they are stainless too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 16:55
Never. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theone&onlymin Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 16:31
Show of hands from anyone that has had a pin come out .
Just asking.

Cheers 
Min
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris950s Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 15:11
Originally posted by Brian UK Brian UK wrote:

Done properly, as flying Tiger says, there would be no problem, but a bodge job could kill you.
I agree, bushing would be the way I would go too. Better than welding up the hole and re-drilling as the heat of welding could distort the caliper body. If the hole were opened up by someone with the right kit and bushes made to an interference fit, so there is no movement between bush and caliper body, then I think that would be a good job. Your local machine shop should be able to handle that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 13:04
I must admit those C clips don't look as if they do very much. I'd rather have some sort of positive location.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 11:23
Or this. It looks on inspection like an extra precaution and is at least as secure as the puny c-clips.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 10:07
For someone with the right kit it should be a fairly simple job.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 09:46
Thanks to everybody for their replies.
I do of course take safety seriously, otherwise I could have for example put silicone in the hole with the pin or epoxy resin etc etc, i.e. a bodge, but I don't ever intentionally bodge anything.
 
After posting last night and reflecting on my comments, I quickly realised myself that an R clip wasn't a good idea if only because of the potential weakening of the pin, so sleeving / bushing seems to be the way to go. I do know a couple of engineers (one a Guzzi fan and retired) who may be able to help me with this, so thank you all again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 07:51
Done properly, as flying Tiger says, there would be no problem, but a bodge job could kill you.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2019 at 23:47
Got a horrible feeling any kind of apparent modification to a brake caliper might be an MOT fail. The repair would have to be very good to remain original in function and appearance, and not any kind of apparent "bodge". E.g. drilling holes for R-clips is out.


Many years ago I remember replacing a brake linkage on a Reliant with a nut and bolt (can't remember why exactly), but was later told can't do that, must be a plain clevis pin with a split pin, as per originally.

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