Posted By: John_Kunkel
Master Cylinder Corrosion - 07/03/20 07:54 PM
Most old iron MC's (used with glycol fluid) that I've disassembled have pitting in the bottom of the bore. I've only disassembled one later aluminum MC and it wasn't pitted.
Anybody with more experience with the aluminum MC's, do they tend to not be corroded inside over time like iron?
Posted By: moparx
Re: Master Cylinder Corrosion - 07/03/20 08:16 PM
i have had the same experience as you, except i have torn apart six or eight late model aluminum masters [mini van units] to just investigate the differences between years.
Posted By: Mastershake340
Re: Master Cylinder Corrosion - 07/03/20 08:20 PM
That along with weight are the reasons they moved from cast iron to aluminum castings.
Posted By: Sniper
Re: Master Cylinder Corrosion - 07/03/20 08:52 PM
Aluminum M/C's have the bore anodized so corrosion shouldn't be an issue but as with everything there is always an exception.
Posted By: dragon slayer
Re: Master Cylinder Corrosion - 07/04/20 02:17 PM
Won't react to moisture like iron, but I have seen the aluminum pistons corrode/pit. Maybe only when in contact with steel too (shims, springs). Probably galvanic corrosion.