Slow clutch engagement when cold

I usually park in the garage but last night the truck was out in the driveway and it was 18F when I hopped in it this morning. Until things warmed up I noticed the clutch pedal was slow to return back to the engaged position after it was pressed down.

Is this normal? Thanks!

 

Yup, and the best part? It never really warms up until the weather does. Lucky you're in texas haha.

 

Yep, it gets almost undrivable unless you let the truck warm up, when it gets below -10f.

 

Yep normal, you should see how it functions in -40

 

Normal for all hydraulic opperated clutches.

 

My old 4runner I used to power shift everything but 1st. Giver

 

The Cayman doesn't do this, nor did my old Miata. Go figure.

 

My 1984 Audi quattro did as well as my Quantum syncro Wagon.

 

Normal.

I'm trying low viscosity brake fluid right now. It was -4f here today and the clutch did distinctly get stiffer but not terribly so.

 

Can you share which you used?

I tried DOT4 from my E46 back in the day and it was hard to tell if it worked.

 

Remember that automotive brake fluid is hygroscopic and absorbs moisture out of the air naturally.

 

Normal. Fluid gets thicker as it gets cold and the pedal gets slow.

My accord takes more than a second for the pedal to return at -40 air temp.

 

pump the pedal couple dozen times before you get ready to put in gear.

Your clutch master cylinder is just a manual fluid pump, movement of fluid creates heat.

Brake fluid has water in it, it will crystalize when it's cold.

 

Sweet cars btw!

 

It's been -12°C the last couple days here. The clutch is very slow to operate until there is some heat in the system. Last year it got so cold, the pedal took a couple seconds for the pedal to return....

 

Pentosin Low Viscosity.

Dot-4+/Super Dot-4 is different from just Dot-4 if I understand correctly.

Those meeting iso 4925 class 6 are required to have about half the cold (-40c) viscosity as dot-3 while still being very similar hot (100c)

 

https://www.fcpeuro.com/products/dot-4-lv-brake-fluid-1-liter-1224116

 

Cool car, I had forgotten about those.

 

I owned 14 of them. VWoA got 3750 for 1985-1988 model years pushed to Seattle, Denver, and Boston.

 

Not true in my experience. My 2020 taco was the first that did this. Not to the same degree anyway. Yes all clutches get a little stiff, but my taco clutch takes about 1s to return to the up position when it gets to 0F or thereabouts and it doesn’t get much better after quite a bit of driving.

I’ve had the thought that the accumulator delete mod might improve things, but I’ve heard it does not.