Ok, its been 110 plus for awhile in my area. My bike is parked outside, in shade, but still warm by the time i start home. I have noticed my front brake is softer after the approximate 30 mins on the highway. I started to look into high temp brake fluid, and came across motul 700 (i attached wrong image, i absolutely mean 700. Not 600 or 660.) I am thinking of dumping that in when i do my next oil change. Does anyone else have experience with higher temp brake fluids? Kinda curious if it will work better in the summer and winter.
Higher temp brake fluids prevent the fluid from boiling when the brakes are hot. This is needed on the track, but rarely on the road. Boiling brake fluid is a sudden loss of brakes. The boiled fluid releases bubbles that are easily compressed, causing the brake pedal to drop to the floor.
You are likely experiencing brake fade. New pads would help more than fluid in that case.
This is a good explanation of the difference: https://www.powerstop.com/resources/towing-brake-fade-brake-fluid-boil/
By, "dumping it in", I hope you mean a full brake bleed. You would have to fully replace the fluid in the lines and calipers to have any effect. This can be done manually by pressing the pedal and opening the valve, with a pressure bleeder, or a vaccuum bleeder.
I dont experience a loss, the lever just feels softer. You let the bike rest, or in the morning its fine. Its been around 120F lately on my ride home from work. I replaced the front brakes @74k, and i am at 81k now. I did a full fluid flush front and rear when i did the front brakes. The rear brakes were done in may when i had the clutch done. I will check out the link for sure though, thank you.
Edit: i previously installed speed bleeders and they work a treat.