Corrosion and Wheel Cylinder Pistons

LHudson

Is there a magic substance to put on wheel cylinder pistons to prevent corrosion?  I am sure grease or oil would work. Would it cause problems down the road? The reason I am asking is, I done a complete brake job or the Jet about a year ago. When I got it out of storage a couple wks ago, the brakes were stuck. Took them apart and at least one piston in every cylinder was corroded and stuck.  Never had one to do this before.  Just asking.     LHud

Glowplug

Larry the aluminum/pot metal Pistons are corroded due to dissimilar metal and the presence of moisture.

Frankvintagefullflowcom

Don't use petroleum based grease or oil! A silicone lubricant won't attack the rubber parts.

F

Ol racer

FYI,
 After having the same problem on my Cars that set a lot, I found using Synth DOT 5 Brake Fluid cured the problem. DOT 5 does not attract moisture like regular B/Fluid..
Be right or wrong to switch fluids, I simply drained the Master Cyl then poured DOT 5 in (which is a different color) then bled each Wheel Cyl until bled the DOT 5's Color.

Geoff

Silicon grease as used by plumbers does the trick.  Just smear a small amount around each piston.

LHudson

Thanks guys for the suggestions. I already had considered the Dot 5 fluid. There was no rust between the cups where the fluid was. It was the pistons corroded in the bore where there was no fluid. I usually use a light oil of some type. This time it looks as thought I never anything. Thanks again. Wanted to see what others was doing to address the problem.    LHud

48Sed

Ken

Can the  DC 111 be used no matter what type of brake fluid is used ?

LHudson

Went by the local napa store yesterday. Found a tube of Sil-Lub. It is a silicone lube for brake systems. It said on the package that it could be used on disc brake pistons and rubber products. I will use it and see what happens. Thanks guys.    LHud

LHudson

A correction to the post yesterday. The correct name of the product is Sil-Glyde (756-1351).     LHud