Rear Brake Wear

[Spout]

Not to the pads or the disc, but to the caliper parts.

This don't look right:

 

[Spout]

Pads at their trailing edge have dropped down.

Further investigation revealed two nasty grooves in the ally caliper/pad mount:

 

[Spout]

And a far from happy pin:

 

[Spout]

This is at 34,000 miles, on only the second set of pads.

I'm suprised the caliper parts wear faster than the pads or disc

 

[littleredrooster]

I'm struggling to understand that. For the caliper to wear, it must have been mis-located at some point in its life. The wear on the pin could not explain that, because it only locates the pads, not the entire caliper.

Is it possible that one of the mounting bolts came out at some point in its life?
Or has the bike had a serious bearing failure in the rear drive?

 

[Timolgra]

And a far from happy pin:

sure that's not one of your fork legs?

 

[Funners]

There is supposed to be a steel clip on pad slider on that shoulder to prevent......the pads wearing out the softer ally mounting, obviously as some point the pad has be lost/removed and dirt and vibration have done the rest,
needs a new mount that does, tho you might get away with buying a new clip on piece as that will keep the pads where they should be !

 

[Spout]

There is supposed to be a steel clip on pad slider on that shoulder to prevent......the pads wearing out the softer ally mounting

If you look closely on the photo, the clip can still be seen, although this has either worn through aswell, or there was a gap in the clip.

The bike has been used in muddy conditions providing abrasive materials.....
.....and I had to ride home 50 miles or so with a failed rear drive bearing (the rattling brake highlighted the bearing failure). Well spotted LRR

 

[Spout]

New pad clip (with araldite to fill the holes under it) and pad pin now installed.
I also noticed that the anti vibration clip didn't have any "spring" in it. It was probably this that allowed the pads to rattle around enough to cause the damage. New clip now in.
The caliper/mounting plate sliders didn't show any wear.

Will be checking for further wear in future.