Rear brake pin

[Magwych]

Not the greatest photo, but it may show that the pin is basically parallel all the way from the retaining pin hole to the far end, which has a taper at the last few millimetres.
Mine have all worn as you describe, the pad wears away at the pin, creating a notch in it. The pad then catches in that notch. Replace the pin every time you put new pads in; or, rotate it 180 degrees and replace every second set

 

[Santa-2512]

Thanks for all the replys,

Pictures attached,

Just been out and had a better look, i'm pretty sure its as Magwych describes.

The pads arn't too bad, the uneven wear, is about .5mm, so nothing to get overly excited about.

The thickness of the pad backing does sit in the groove, which kind of confirms what i thought

 

[milleplod]

A picture speaks a thousand words.....!

I must check my stainless one to see if that's wearing away.

Pete

 

[Bendy toy]

My retaining pin was MUCH worse than that but the pads were not binding. Do rub some anti seize into that retaining ring so it will release more easily next time the pin has to come out. It has to compress to release. Rust under the ring restricts it.

New pin and pads anti rattle spring kit is about £18.

The pads wear faster on the piston side with one pad thicker from new so they should be the same thickness when worn out..

 

[Greenman14]

The pin is not a simple split pin, it should be an "R" pin and the knee of the R locates in the groove adjacent the hole.

 

[milleplod]

Its not a simple R-pin either! Its one of these, no.1 in the pic -

Pete

 

[Santa-2512]

Its not a simple R-pin either! Its one of these, no.1 in the pic -

Pete

Beat me to it

 

[Bendy toy]

A simple R pin will fit but not quite as prettily.

The OP's pad pin is fine (IMO). Any brake binding is not due to the pads sticking.

 

[Ted]

A simple R pin will fit but not quite as prettily.

The OP's pad pin is fine (IMO). Any brake binding is not due to the pads sticking.

Agree the usual culprit is one of the sliders rusted up and stuck.

 

[Bendy toy]

Mine was binding badly but the slider pins were all as new. Pistons were a bit stiff but easily popped out and cleaned & (red) greased. The problem turned out to be master cylinder. As said, if you have the old type (with thin cover boot/gaiter) its likely to be corroded, sticking and trapping fluid in the hydraulic lines.

 

[Santa-2512]

Wont know anything more until i get my rear drive unit back

i'll give it a clean and lube before then.

My suspicion is the non piston side is a bit gummed up, so a strip and clean should help.

The pistons move freely, and independantly, without popping the other one out when depressed.

 

[Bendy toy]

Check the master cylinder for dirt/corrosion where the piston pin pushed into the rubber dust cover.