Hi all,

I was wondering why you shouldn't use silicone grease on new caliper pistons and seals?

I've bought a kit online and they've supplied the two types of grease, one silicone for the slider pins and the other I'm guessing is the red Castrol grease they labeled as hydraulic grease.

I've asked them and their response was "Silicone grease should not be used with piston seals and dust covers as it does not dissolve in brake fluid, where red rubber grease(blue packet) does" but what does it matter if it doesn't dissolve in the fluid?

But wouldn't the other grease do the same?

Yea this

Silicon is its own element on the periodic table and doesn't react with most carbon elements and so retains ist form of sorts

Most other greases break down when reacting with other materials chemicals elements stc

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BLACK RALLYE - phoenix
WHITE RALLYE - valliant

http://public.servicebox.peugeot.com/

https://www.gov.uk/check-mot-history

Ok, Thanks guys.

I know DOT 5 is no good for the ABS pumps in our cars.

I'm going to start using it for karts as some kart systems that I've rebuilt that have had DOT 5 in have no signs of pitted bores or corrosion. Most look like new.

I'll be using DOT 4 in the car and stick with silicone in the sliders and the red stuff on the piston and seals.