PP Brembos & Wet Conditions

[wparsons]

If the pedal is soft, it's not cold conditions making the pads bite less. If the pads just don't bite but the pedal is firm, it could be water/ice/cold causing it.

If you have a soft pedal, bleed the brakes, or better yet totally flush the fluid.

[Tcoat]

Originally Posted by ZDan

I ran into the same thing with my FD on Stoptech calipers. I think the issue is that rigid fixed calipers maintain the pads more parallel to the rotors while not braking, whereas sliding calipers kind of flop around. With the pad held parallel to rotor, you get a uniform film of water between them which due to viscosity and surface tension requires some effort and time to get pushed out of the way. Vs. with a sliding caliper which will have more of a wedge of water which is more easily squeezed out.

That's my theory anyway... For sure it is a noticeable phenomenon that does not exist with sliding calipers (at least I've never experienced with them).

Adding to this, there is a much larger surface area of water to push out of the way. Since water is not compressible the more surface area the longer it takes to move and that much more energy is needed to do it.