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Old 12-03-2022, 11:02 PM #16
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You've made a few valid points and explained some things more in depth than I went into. Back in the '80s it was cheaper to buy a new piston and rebuild kit from Toyota than buy a reman caliper, so I've rebuilt a lot of them. I understand what you say about the silicon grease and all that. Been there done that.

But moisture contaminated brake fluid is still a major contributor to caliper pistons freezing up. The nature of brake parts constantly cycling from low temps to very high temps thru normal use is a major factor.

Not everyone here lives in the very dry west coast where this may be less of a problem.
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Old 12-03-2022, 11:20 PM #17
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Quote:
Originally Posted by fourwd1 View Post
You've made a few valid points and explained some things more in depth than I went into. Back in the '80s it was cheaper to buy a new piston and rebuild kit from Toyota than buy a reman caliper, so I've rebuilt a lot of them. I understand what you say about the silicon grease and all that. Been there done that.

But moisture contaminated brake fluid is still a major contributor to caliper pistons freezing up. The nature of brake parts constantly cycling from low temps to very high temps thru normal use is a major factor.

Not everyone here lives in the very dry west coast where this may be less of a problem.
I've torn down tens of thousands of caliper cores from all over the world and the only ones where I've every seen rust on the wet side of the seal were those that had been sitting outside in a pile of junk getting rained on for years.

While brake fluid is hygroscopic, the whole point of that is so that water never exists in high enough concentrations in the system to cause corrosion. If it didn't mix with water, we'd have little droplets in places causing corrosion.
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