Ross365
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I've spent some time over the last week or so very carefully refurbishing the front calipers on my Celica. Just about the last thing to do was grease the sliders and I spent a little money to get a ceramic-filled silicone grease specifically made for that purpose (PERMATEX 24129 1650°C Ceramic Extreme Brake Parts Lubricant). When freshly inserted, they glided in and out very easily.
Leaving the calipers overnight, I was really surprised today to find how much force was needed to get initial movement of the sliders; once they'd moved just a little (~1mm) then no problem, but that first movement, quite some force. I've found this before with other greases. On one previous occasion, I used some Rocol RT15 fluorocarbon grease on sliders and had just the same experience (and that is a seriously high-quality and expensive grease, about £1 per gram).
Looking on Google, I see some hits that suggest that no grease should be applied to slider pins (apparently recommended for some BMW's). Alternatively, could it be one of the those cases where you apply the grease, and then wipe it off with a dry cloth (leaving just the thinnest, invisible film? Anyway, I don't intend to leave them as they are.
Leaving the calipers overnight, I was really surprised today to find how much force was needed to get initial movement of the sliders; once they'd moved just a little (~1mm) then no problem, but that first movement, quite some force. I've found this before with other greases. On one previous occasion, I used some Rocol RT15 fluorocarbon grease on sliders and had just the same experience (and that is a seriously high-quality and expensive grease, about £1 per gram).
Looking on Google, I see some hits that suggest that no grease should be applied to slider pins (apparently recommended for some BMW's). Alternatively, could it be one of the those cases where you apply the grease, and then wipe it off with a dry cloth (leaving just the thinnest, invisible film? Anyway, I don't intend to leave them as they are.