I know it's brake fluid that goes inside the clutch MC but can I put any kind?

I was thinking about Motul RBF660... I got half a can left from my brake job... Or should I stick with dot3 or 4

 

the clutch system doesnt see the temps that the brake system does, i bet the clutch is much less sensitive to type of fluid used than your brakes are.

 

^^Agreed. It would be a total waste of RBF. Considering its about $20 for .5 liters, just save it for the next brake job.

 

DOT 3 will be fine.

 

Yep. Regular ole cheapo DOT3 is fine for the Clutch Hydro system. I personally use the Castrol GT LMA brake fluid, simply because of the high-humidity area in which I live, and the low moisture absorption properties of the fluid. It's probably a bit overkill, but it's only $.79 more per bottle than the cheap stuff.

 

Just curious after reading this. Does viscosity differ between brands and dot levels?

 

i guess viscosity between DOT3 and DOT 4 are alike. but the heat rating of the DOT 4 is much higher than DOT 3. These fluids do wear out as they easily attract moisture. so its important to change these fluids as often as you change your oil. they do get contimated in the brake and clutch hydraulic system.