🤔  Why is one of the rear caliper guide bushes/sliding pins coated with rubber ?   🤔

 

 

Edited 16 September, 20241 yr by 2stroke

Because like the others it slides in rubber bushes, its quite normal for some to transfer to the pin, I would not describe that as "coated" and I can see similar traces on the other slide pins.

11 minutes ago, J.R. said:

Because like the others it slides in rubber bushes,
its quite normal for some to transfer to the pin,
I would not describe that as "coated" and I can see similar traces on the other slide pins.

🤔  ...I do not understand your answer !
Your answer does not answer 'WHY'  only one of the pins have this rubber sleeve on ?

 

my guess is the rubber boots on the end are to help dampen high frequency vibrations and stop squealing noises and such.

 

I've seen some on other Makes/models that have a metal sleeve on the end making it slightly tighter than the other guide pin presumably to serve the same purpose. Not sure why they didn't make them all like that though.

4 minutes ago, 2stroke said:

Your answer does not answer 'WHY'  only one of the pins have this rubber sleeve on ?

 

Yes it does!

 

20 minutes ago, J.R. said:

I would not describe that as "coated" and I can see similar traces on the other slide pins.

 

The shorter answer is "because!"

You ask why one of the pins is "coated in rubber" then ask why only one of the pins has a rubber sleeve, if the other three dont have sleeves then you have yourself answered your first question and the answer to the second one is "because!"

 

Never in my lifetime will I waste money replacing perfectly serviceable guide caliper pins, is it perhaps the only way to buy new bushes?

Apologies, now my eye (singular) can see what you mean, one of each pair of guide pins has a reduced diameter shaft with a plastic bush.

 

I am considering them to be pairs as the kerbside ones are rusty and the offside ones are shiney.

 

I never remove the pins and simply partially withdraw them making sure they are not seized so have never encountered the bushes.

Edited 16 September, 20241 yr by J.R.

It's used to reduce vibration, they should be on the trailing side of caliper