betelnut

FSM says to use "lithium soap base glycol grease" to lube my clutch slave cylinder piston's rubber parts. Google results also indicate its recommended use inside brake master cylinders. Generalizing, this grease appears to be recommended for rubber parts inside brake and clutch hydraulic systems.

There's a lot of speculation about what it is. This link demystifies it:

http://www-odi.nhtsa.dot.gov/acms/do...0V499-1782.pdf

The link describes its use in a Toyota brake cylinder recall. The grease is applied to the internal rubber parts of the cylinder. The last pages contain the "material safety data sheet" which says it consists of 74%-79% base oil, CAS #9003-13-8, or butoxypolypropylene glycol; and 12%-17% lithium soap thickener. That explains its name and should provide good leads to those still curious.

The grease is available from Toyota parts counters as P/N 08887-01206, which I found online for $8 for 100g, which should last you and your wrenching buddies a life time.



Odds of flames: 1 in 10; dead silence: 8 in 10

betelnut

One other thing,

This same grease is apparently called for in some external brake applications, such as caliper sliding parts. This adds greatly to the confusion. Some say that the grease is water soluble and has no business being used for such applications, and one Russian site claims that this is simply a mistake in the FSM. I was not looking for grease in external applications, so I did not seek out this information, but I did not see anyone swearing by this stuff used for their caliper pins, and the arguments against make a lot of sense. Someone else will have to take this up this line of exploration from here.