Rear Brake Mounting Bracket

[rodent]

Hi All,

Brakes again, I'm afraid. Not the front for a change - although
I did just change all the pistons and seals on those - but the rear.

The rear brake on my '91 AT is less than happy. One of the
"slider pins" (I think they are called) is seized solid in the bracket.

It's the allen (alan? Alen?) bolt circled in red in this photo:

http://web.rodentia.org.uk/brake

As I expect a lot of you know, the hex-head bolt (circled in blue) is
threaded at the end and smooth near the "head" of the bolt, and
screws into the bracket. That one is fine - came out no trouble.

The other one is the other way round - smooth at the "far end" but
threaded near the head of the bolt - it's supposed to screw into the
calliper and just sit in the bracket, allowing the sliding calliper to
do it's thang.

It's don't, unfortunately.

Now, we've tried everything we could to get it out, but with no
luck. I've got a bolt/pin thing on order, and it looks like we might have
to drill it out.

However, as that might well bugger up the bracket, I've been
looking around for a replacement (since a new one from a dealer
is 90 quid!)

I've found this on ebay:

http://tinyurl.com/2dhh4r

Which seems good, assuming that it isn't also seized, but it's
listed as being for "95-01" bikes, and mine is '91. Now, in the
photo it looks exactly identical - but I wanted to ask the massed
ranks on here if they know otherwise!

So, that's it, really - is the rear brake mounting bracket different
for different models, or did it stay the same?

Also, as a side note, has anyone brought anything from "e-breakers"
aka http://www.m1salvageandbreakers.co.uk ? Ok or one to
avoid ?

Cheers in advance.

[YEN_POWELL]

Surely that pin stays mounted on the plate and the caliper just pulls off toward you? Then you can grease the pin or replace the rubbers. Have you tried pulling the caliper off?

[rodent]

yeah, tried that. It is supposed to come straight out, you are dead right -
it only threads into the calliper, not the bracket. So once the hex-headed
bolt is removed, it should slide off easily...

But it is stuck fast. Really, really doesn't want to go anywhere. Hence
the problem and the question re: the bracket.

[YEN_POWELL]

I'll try tonight cos I have to replace my rear pads but I'm certain that what I do is, with the whole thing still on the bike, undo the hex bolt and remove it, swing the caliper up (pivoting on the pin you're having trouble with) and then (if I'm doing a clean up and regrease) pull the whole caliper off the pin without taking the allen headed bit off.

I know that it can get a bit tough to pull cos of road gunge, but just in case I'm wrong let me try tonight first to confirm.

[rodent]

I'd appreciate that - cheers. I know what you are saying re: swinging the
caliper up pivoting on the "problem pin", but I thought the head of
the pin in question was wider than the hole. But it would be nice of
you to check!

This whole problem was discovered when my rear brake got less and
less effective - if you look at it when you operate the lever, you can
see that the floating caliper is working properly at the rear of the bike,
but is stuck at the front, so the brake is coming on at an angle, and
consequently not applying much force, iyswim.

[YEN_POWELL]

I had an iffy back brake on my last AT and bought all the seals ready to strip it down. Turned out the brake pedal was in need of removal and greasing. It was like new brakes, never used the seals in the end.

[SteveWilko]

Is that a rouge allen screw maybe? ....I am looking in the Haynes manual and seeing a diagram that displays 2 hex headed bolts....

...I emphasize..... HAYNES....& DIAGRAM......

[rodent]

I just had another thought that might explain part of the problem - and
something I should have mentioned earlier. My bike is parallel import -
originally from Italy.

I stupidly forgot to mention it, but I never think that something as small
as a bolt would be different - but it has different bulbs and things like
that, so it might do.

However, in other news, looking at the fiches for the RD04:

http://www.xrv.org.uk/RD04_FICHE/rd0...es/f__1200.jpg

and RD07:

http://www.xrv.org.uk/RD07_FICHE/rd0...es/f__1200.jpg

if there is a difference in the bracket I can't see it. Which is something,
at least.

It's pin number 10 in that first diagram we are talking about, by
the way - and you are right, looking at that it *does* look like it
should just slide off.

But mine is more like the photo from ebay:

http://web.rodentia.org.uk/brake

It's a crappy photo, but you should just be able to make out the
top of the allen bolt in the red circle - quite clearly wider than the
bit of the caliper it goes into.

Interestingly, the photo from the Haynes book of lies[tm] is the
same - doesn't even match the diagram on the next page!

Ho hum. Times like this makes me glad I've got a spare bike ;o)

[rodent]

Is that a rouge allen screw maybe? ....I am looking in the Haynes manual and seeing a diagram that displays 2 hex headed bolts....

...I emphasize..... HAYNES....& DIAGRAM......

Sorry, I'd replied to another post before I read yours ... yes, the Haynes
diagram does show two hex heads, but the photo (nearby? opposite page? I don't have mind to hand at the moment) shows the allen bolt, like mine.

As I just said, mine is a) from Italy, and b) secondhand, so it is entirely
possible it was either slightly different to start with, or someone put the
wrong bolt in at somepoint.

I mean, I found the spare key tapped up inside the rear light about a
year after I bought it, so one owner obviously had interesting habits. I
guess he thought if he lost his keys he could always borrow a screwdriver
to get the rear light cover off :o)

[YEN_POWELL]

Right, just went out to the garage to change my rear pads and it was very cold and I'm very lazy. Hold on thinks I. I have a spare rear caliper. So here is the caliper on my current bike

looks the same, with the same allen type bolt on the end.

Now here is the one from my 130,000 miler. Don't let looks fool you, this was a free moving caliper when taken off the bike. As you can see the allen headed bolt has never been removed in it's life, the caliper just pulls off the bracket.