bunch of brake questions

[zozoka1212]

The rotor just like any other metal have heatstress. When you apply the brake on the cold rotors and you apply your brake on the hot the grooves wont be on the same spot. The calipers will track the wiggleing rotors. When you do that they putting extra force on the pistons. Also it will creat bigger grooves and more air pockets between the rotor and the pad. The air travels the heat differently then the metal to metal. It creates less contact area and you are loosing some of the efficiency of your brake. It creates bigger grooves lot faster if you have runout.

Like I said it helps a lot if you indicate the rotors and sometimes all you have to do is index(reposition) your rotor or use different torque on each lugs to creat less lateral runout. Sorry if I am not being to technical here. I learned all these too many years ago in another language.

zozo

[C-Kwik]

Just so we are clear, if I correct your terminology, I am doing so for two reasons. 1. So we might make sure we are understanding each other correctly. 2. So other people can follow along better. So no worries if you aren't using the correct terminology.

The rotor just like any other metal have heatstress. When you apply the brake on the cold rotors and you apply your brake on the hot the grooves wont be on the same spot. The calipers will track the wiggleing rotors. When you do that they putting extra force on the pistons. Also it will creat bigger grooves and more air pockets between the rotor and the pad. The air travels the heat differently then the metal to metal. It creates less contact area and you are loosing some of the efficiency of your brake. It creates bigger grooves lot faster if you have runout.

If you are referring to radial expansion of the rotor, I can see the potential for the pad to interface in a slightly different radial position. But how then does lateral runout contribute to this as lateral runout has no effect on radial expansion (at least no more than heat created from the friction between teh pad and the rotor normally does)?

[zozoka1212]

If you think about it, it does it both way. Radial and lateral. Say you have a perfect circle groove in the rotor. When it is running out on lateral it will crealte a wider and deeper groove. Now if that rotor heats up the groove is actually out of the original position and creates even deeper and wider groove. Also puts stress on the pistons. Deeper the groove more of the stress you putting on the pistons.

zozo

[smockers83]

Look at zozo being all technical and scientific. Haven't really seen this before, didn't know you had it in ya.

[zozoka1212]

heheheh

Yeah mostly I do is PW. I know.

zozo

[SVTCOBRA]

heheheh

Yeah mostly I do is PW. I know.

zozo

I mention catching up with you and now you on here 24x7..

[zozoka1212]

I have to lead.

zozo

[SVTCOBRA]

:I have to lead.

zozo

Evidently!!!

[gwoods]

Evidently!!!

loosing battle SVT, Zozo is in Canada their water is 3% alcohol!

[zozoka1212]

zozo

[smockers83]

I dunno, SVT gots that there moonshine contraption

[zozoka1212]

Outdrink a Canadian is like try to teach the fish to swim.



Who's talking. I don't even drink.

hahahha

zozo

[C-Kwik]

If you think about it, it does it both way. Radial and lateral. Say you have a perfect circle groove in the rotor. When it is running out on lateral it will crealte a wider and deeper groove.

How? Lateral runout creates additional pressure on the pad as it reaches it's high spot at a direction perpendicular to the face of the rotor. In which case, the pad's contact area would still only be displaced by the radial thermal expansion of the rotor. I think you need to be more specific about the actual mechanism that you claim to be causing this.

Now if that rotor heats up the groove is actually out of the original position and creates even deeper and wider groove. Also puts stress on the pistons. Deeper the groove more of the stress you putting on the pistons.

How does a deeper concentric groove put more stress (perhaps pressure is more accurate) on a piston? Lets assume a case where no lateral runout exists. A deeper groove will not provide any more force on the caliper pistons as the total force applied by the piston remains the same and there sill be no additional force trying to push the piston back into the caliper. Lateral runout can cause this effect when its going from a low to high spot. Unless your definition of a a groove is a whole lot different than what I am thinking, I can't see how this is possible...