Posted by Ben on March 06, 03 at 09:42:00:
In Reply to: Class of things posted by Ben on March 06, 03 at 09:26:11:
Forgot to answer how Praise Dyno stacks up and pricing.
Hot link below is to Praise Dyno Brake and will have latest pricing and there usually is special for internet buyers. Tell them you saw recommendation from here.
About same price as OEM from dealer for just materials. You have to factor in labor (if yours, or you pay someone else).
As for how they work, the higher coefficient of friction means they "grab" the rotor with higher rates of force than lower coefficient of friction materials. Many factors. One huge thing is temp and the level at which the "start" to work and how far up the temp scale it "continues" to work at. Some don't have much to anything in stopping power when cold, others don't go up high enough in temp and fall off the friction charts fast as they go up in temp.
Another is outgasing while moving up in the temp operating range. The binders used to glue the stuff together, along with the friction material itself all are "consumed" while braking. Faster rate as the temp goes up (all of the vehicles motion is converted to heat by the brakes as the means to stop...faster/heavier the more heat generated). When the stuff outgasses, there is a boundry layer of gases between the friction material and the rotor surface. This acts like grease and lifts the friction material off of the rotor surface...aka no braking force being generated. The better level materials (costs more) don't outgas till at much higher temps (everything will outgas at some point...even steel).
Why "bedding" in new brake so important. "Cures" the material so that it will not outgas as much later on. Also smears friction material onto the rotor surface so that the pads will have complimentary fricton material to ride on. NOT bedding in properly will have ill acting brakes for a long time and unsatisfactory performance unduely blamed on the pads.