Originally Posted By: wokeupdead
Originally Posted By: doitmyself
Originally Posted By: gogozy
thx doitmyself, the PAO in the green thing often swell the robber boots?
I'm not an expert on brakes or grease. I'm also not a chemist. I do know that certain car brands have rubber brake components that seem more sensitive to swelling per my Google searches.
The PAO brake greases such as Permatex, CRC/Stalube, etc. all advertise they are plastic and rubber safe. Yet, if you look at the elastomer compatability chart at the bottom of the following link, you can easily see that silicone is safe with all elastomers listed(except silicone) while the PAO has several that are not compatable (buna-s, EPDM, others).
http://www.nyelubricants.com/_pdf/literature/engineering_pdf/Engineering_Ref_Charts.pdf
Again, I'm just making my decisions for myself based on internet research.
Doitmyself is correct. silglyde not identical to dielectric grease but proves to be excellent in brake boot applications.
The other brake greases will swell most rubber seals/boots. I prefer to use dielectric grease for the boots, but shop buys silglyde.
thanks! i have a spare tub of green grease but i don't use it anymore after learning from BITOG about silglyse.
thx to doitmyself for the chart, the chart has good info. i think I remember there were some debate long ago that how group 4 oil (PAO?) will harden seal and need a bit of other oil to condition the seal.