Hydraulic clutch in the winter.

[Jedd]

So, I'm looking for some information. This is actually on Toyotas new standard tansmissions (05 & up) where the brake fluid resevoir is used for the clutch resevoir

The problem that I've been running into for the last couple years is that the fluid viscosity starts getting very thick by -25 celsius and by -30C i can push my clutch pedal to the floor take my foot off and watch it return slowly....not good for clutch life.

I'm myself a heavy duty mechanic and cant seem to dig up any information on brake fluid viscosity versus ambient temperatures. Toyota has been no help to me, they just stare with jaws dropped in amazment whenever I bring it up.

I'm starting to think that Toyota hasn't taken into account that their trucks do still get used in harsh climates.....

So any takers?

 

[Hltoppr]

...and you're getting these temps in Virginia? Geez...you're making me glad I live in the Southwest....:sombrero:

I'd start by using a full synthetic fluid, then, maybe wrapping the master cylinder with insulation (I'm thinking the silver/bubble type for RVs, etc.). If it's just in the mornings, maybe try an engine blanket or battery warmer on the master.

HTH,

-H-

 

[Jedd]

nope nope not Langley Virginia, I'm a Canuck...Langley, British Columbia i'm just outside Vancouver, and no it dosen't get that cold here either, we're lucky to see -10, but I usually spend most or all of my winters a lot farther north. This winter I'll be up in the arctic for a bit.

It is pretty thick in the mornings the big problem is once you get driving, take -30C weather....or for arguments sake -40 cause it's the same for both of use, and drive at 100km/hr (60miles?) and you've got really ********** cold air surrounding the slave cylinder

The problem with going to a full synthetic brake fluid, ie DOT 5 or "purple" brake fluid is that not all seals in your sandard brake components are designed to run with that fluid.

I have been considering wrapping heat tape (like the stuff you wrap around water pipes usually 120V) around the slave cylinder (master for the clutch is in the cabin) and insulating the line, (with the relective bubble stuff you where refering too) draw back to insulation is that I dont want to be insulating the lines when it's +30C or higher in the summer....I think I may jsut have to "winterize" the truck. But it would be nice to find a permanent solution.

 

[mountainpete]

Jedd,

Take a look at the data on Amsoil synthetic fluids - it meets the standards. I've had great success in a number of vehicles with it: stays loose in the cold.

Pete

 

[Jedd]

Thanks Pete, will do.