white residue on brake pads

[cat007]

Hey.

Does anyone know what this white residue is? pads are Mintex 1166's

[barryogen]

salted roads? or whatever that other stuff is that they use these days.

[cat007]

salted roads? or whatever that other stuff is that they use these days.

Only used for to drive to Pukekohe from the North Shore, few laps, then home.....

[johndoe1025]

to me looks like some form of corrosion or mayyyyyybe crap off your discs? (harder pads=more disc wear) but thats all i can think of. im no expert

[1I1]

probably completely wrong but maybe due to heat? (ie pads burning?)

[cat007]

probably completely wrong but maybe due to heat? (ie pads burning?)

I wonder if you are correct

I could smell them once after a hard stop into the hairpin - but the other times I couldn't

[85AW20v]

Looks like it's heat related but send the photo's or take the pads into Race Brakes, they should be able to tell you.

[KinLoud]

The binder solvent (or something) boils out of the pads during the early heavy brake applications - this is called "bedding in".
My guess is that the white powder is the result of the bedding in.
I remember seeing this once on my mintex pads ages ago - it was quickly hidden by all the brake dust!

Ken
Auck
021 408 863

[cat007]

As quoted from an email from the guys at Race Brakes regarding conditioning pads:

"A powdery gray area will become visible on the edge of the pad (actually the edge of the friction material in contact with the disc - not the backing plate) where the paint and resins of the pad are burning off. When the gray area on the edges of the pads are about 1/8" deep, the pad is bedded.
For a race pad, typically four 80mph to 5 and two 100mph to 5, depending on the pad, will also be necessary to raise the system temperatures during break-in to the range that the pad material was designed to operate at. Hence, the higher temperature material can establish its layer completely and uniformly on the disc surface."

Interesting....