how old is the rubber parts?Well, trust me that there a fundamental issue in this particular case ; there's just too much rubber trying to occupy too little space. The component is just oversize and applying too much pressure on the slider. No grease will solve it. Unfortunately, I cannot see how to skim off 1mm off the diameter of the rubber gaiter skirt . Perhaps Mr Toyota's expensive spares dept can help.
not being an engineer this may well be the case especially on items with tight tolerances and lots of movement . I always thought the point of copper slip was it's way softer than steel and wont wear off like grease hence the use on the back of brake pads , It's not like the sliders are an interference fit or move in and out a lot. I've used it for many years now on sliders with no problems at all and will continue to so .I was taught not to use copper ease on moving parts as the copper particles can act as an abrasive.
I have used copper slip in the past but I find it drys up and becomes sticky on caliper slider's. So now I use a standard bearing grease.not being an engineer this may well be the case especially on items with tight tolerances and lots of movement . I always thought the point of copper slip was it's way softer than steel and wont wear off like grease hence the use on the back of brake pads , It's not like the sliders are an interference or move in and out a lot. I've used it for many years now on sliders with no problems at all and will continue to so .
Shoot down in flames if wish .
The original use of coppergrease is as anti-seize. The copper in theory prevents galvanic corrosion.not being an engineer this may well be the case especially on items with tight tolerances and lots of movement . I always thought the point of copper slip was it's way softer than steel and wont wear off like grease hence the use on the back of brake pads , It's not like the sliders are an interference fit or move in and out a lot. I've used it for many years now on sliders with no problems at all and will continue to so .
Shoot down in flames if wish .
And I've got to regularly clean dried out coppergrease from caliper slides, due to it drying out to a sticky mess, causing brakes to bind.Don't over think this, you just need something to stop it rusting up and to give it a bit of lubrication and not too much. I've always (30years) used copperslip and never had a problem with it.
ceratec slider grease from euros not cheap think it is silicon based