Brake Rotors Don't Warp
12-29-2010, 10:32 AM
#46
A 1999 Grand vitara I serviced had a completely inoperable front left wheel. upon further inspection we found that the disc rotor was so deformed that it was jammed up against the caliper bracket. With the rotor removed and placed on a flat surface, it was clear to the naked eye that the surface was severely distorted.
The car was driven by a young graduate student who did complain of various braking issues but was too busy to bring the car in.
resurfacing the rotor resolved the issues.
----------------
in the country I worked in, new rotors were prohibitively expensive and were not replaced until they were potato chips
The car was driven by a young graduate student who did complain of various braking issues but was too busy to bring the car in.
resurfacing the rotor resolved the issues.
----------------
in the country I worked in, new rotors were prohibitively expensive and were not replaced until they were potato chips
12-29-2010, 10:55 AM
#47
A = B
does
B = A
?
1. stuff expands and contracts as they heat up and cool down
2. stuff cools via radiation, conduction, and convection
3. thermal stress breaks stuff
You don't seem to be able to apply these 3 basic concepts to brake rotors. Which of those basic physics concepts are simply my opinion?
All of the above. I worked as a professional tech for years after going to school for automotive technology. As much as I liked it, I wanted more out of life, so I got involved in automotive engineering, but decided to complete both a BS and MBA. Today, I'm in management at a blue chip company. I still wrench on cars all the time though... Thanks for taking an interest in my background.
Regarding stoptech:
Their solution to my situation would be to increase brake mass with a BBK. It would bring the equilibrium of the entire system up to a point where there is not enough thermal stress to constantly break rotors. The problem here, is that there are some disadvantages to this.
1. Increased unsprung mass. My track car's engine only makes about 160 lb/ft of torque. Increasing unsprung mass has a very noticable effect
2. cost. At the price I get rotors, I'd need to pop about 250 rotors to break even with the initial cost of the BBK. By the time you factor in consumables, the break-even point is even higher at closer to 400 rotors. This figure is not skewed. The high price of a BBK compounded with the low price of my rotors just makes it seem that way. Cost of time is not factored in, but it isn't an issue changing a rotor between sessions.
You've still failed to show that:
1. brake rotors don't warp (when clearly they do, as refuted by EVERY other poster in this thread as well as direct hard evidence in the form of pictures)
2. blanks are better than non-blanks.
Do you have an opinion on cryogenically treated rotors?
12-29-2010, 11:44 AM
#48
Simple therodynamics. Given your course of study, I would hope you have a basic understanding of physics and that you understand a few thingsl:
1. stuff expands and contracts as they heat up and cool down
2. stuff cools via radiation, conduction, and convection
3. thermal stress breaks stuff
You don't seem to be able to apply these 3 basic concepts to brake rotors. Which of those basic physics concepts are simply my opinion?
So, you tell people what to do, but don't actually do it yourself... I see a trend here.
Regarding stoptech:
Their solution to my situation would be to increase brake mass with a BBK. It would bring the equilibrium of the entire system up to a point where there is not enough thermal stress to constantly break rotors. The problem here, is that there are some disadvantages to this.
1. Increased unsprung mass. My track car's engine only makes about 160 lb/ft of torque. Increasing unsprung mass has a very noticable effect
2. cost. At the price I get rotors, I'd need to pop about 250 rotors to break even with the initial cost of the BBK. By the time you factor in consumables, the break-even point is even higher at closer to 400 rotors. This figure is not skewed. The high price of a BBK compounded with the low price of my rotors just makes it seem that way. Cost of time is not factored in, but it isn't an issue changing a rotor between sessions.
You've still failed to show that:
brake rotors don't warp (when clearly they do, as refuted by EVERY other poster in this thread as well as direct hard evidence in the form of pictures)
12-29-2010, 12:00 PM
#51
I knew you wouldn't be able to take on the authors of any of the links provided.
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