Floating versus Fixed

That’s right, it does help reduce pad knock off. Coming from a racing back ground……… The advantage of floating v,s fixed is that a fixed rotor is more likely to warp with extreme heat then creating pad knock off. Where as a floating rotor has room for expansion and contraction and is less likely to warp. Particularly if you are really hard on the picks then come into a deep creek crossing. The fixed rotor may warp due to the sudden quenching from the water. Floating are good for hard core fast guys. Not for wood-ducks like me.
Hope this helps.

Cheers,
Lefty

Hello Mick,
“Pad Knock Off”
My interpretation, all discs have a certain amount of run out (you could call it warp) this allows the pads after application to be forced back off the disc a bit to allow for free rotation of the wheel.”pad knock off”
If this run out is extreme it will force the pads back further than acceptable so when you grab your lever the pads will have to travel further to apply pressure to the disc.
The feeling is like having no brakes in the initial stage.
This can be just enough to cause an issue when you really need those brakes.
The problem becomes worse when the pads are worn.
With a large disc run out and worn pads in extreme cases you can get the piston jamming in the caliper.
So the pads will not apply at all.

The opposite of all this is to have no pad knock off which will cause the pads to stay against the discs causing premature pad wher and in extreme cases boiling of the brake fluid.

As i said this is my undestanding of pad knock off.

Rebore.