Frequently Asked Questions

Question: Minutes after my car is shut off my StopFORCE rotors make a "clicking" sound.

Answer: The sound you are hearing is similar to the sound you hear from your catalytic convertor after your car is shut off. Specifically the sound is the aluminum rotor hat "resetting" itself onto the rotors surface. This is completely normal of all 2 piece rotors.

Question: Do you offer matching rear rotors to compliment the fronts?

Answer: On the C5/C6 the front brakes account for nearly 80% of the braking power. Other then asthetics the rear rotors from the factory are well suited for street and even track use. I have yet to overheat a set of rear rotors on the racetrack, and short of an endurance race I don't think I ever will. We recognize the appeal of having matching rear rotors but cost concerns and the physical implementation of adapting a 2 piece rotor for the rear have prohibited further development. However KVR rear 1 piece rotors almost identically match the hole pattern of the StopFORCE front rotors. They can be found on the internet for around $100.00-120.00 each.

Question: Why do you use 7075 aluminum for the rotor hat construction instead of the more common 6061?

Answer: 7075 is a stronger metal and costs more to produce. However with these rotors offering the ability of rotor surface replacement it was felt necessary to use a stronger type of aluminum to accommodate repeated reassembly.

Question: Have you gone through any revisions to your manufacturing and assembling process since you began selling these rotor upgrades?

Yes! The StopFORCE brake kits that are currently shipping are version 1.2 A list of the improvements made are outlined below:

Version 1.0 where R&D test setups shipped to racers and enthusiasts in the California area. They consisted of rotor hats made from various grades of metals and coatings. All of these rotors where returned to StopFORCE after testing for examination and have since been destroyed.

Version 1.1 where the first publicly available version of our brakes. The rotor hats consisted of 7075 aluminum hard anodized black. The rotor mounting hardware was zinc coated for rust protection.

Version 1.2 is the most current version of our rotor setup. This version added zinc plating to the rotor surface, done at no addtional cost. It also added the StopFORCE insignia to the front of the rotor hats and preliminary patent # on the back.

Question: What is involved in your assembly/manufacturing process of these kits?

Answer: Our kits go through the following process.

  1. OEM Porsche rotors are purchased from a local Porsche dealer. This is so we can be sure we have recently manufactured rotors (less then 6 months). Rotors obtained elsewhere are greymarket rotors that could have sat on shelves for years. Porsche continually makes changes to the manufacture process, we want to pass these improvements to our customers.
  2. Rotors are disassembled. Stock Porsche steel rotor hats are thrown away and the hardware is saved for our kit.
  3. Rotors and hardware are sent out for paint removal. From the factory Porsche sprays a grey paint on the rotor edges and on the mounting hardware. This paint is very soft and usually is removed from the rotor within 2 months of use, and begins to rust.
  4. Rotors and hardware are then taken to a plating facility where they are zinc plated silver for rust protection.
  5. The rotors are taken back to our warehouse and the hardware is sent to a facility to have high temperature/strength Loctite DRI-LOC® applied to the threads of the hardware. This makes assembly of the rotors and hats easier,cleaner and safer.
  6. Around this time an order is placed with our machine shop for our patent pending rotor hats. After they are produced they are picked up and dropped off at a plating facility that hard anodizes the hats black. They also mark the rotors with our name on the front and laser etch our preliminary patent information on the back.
  7. With all the parts to complete our kit in stock we now begin the process of assembling them. Depending on the amount of rotors/hats we have produced it can be anywhere between a 4 hour and 8 process in assembling them.
  8. The rotors are coated with Wurth CU1100 high temperature copper antiseize along the mating surface between the rotor and the hat.
  9. The rotor and hat are mated together and the hardware is installed. Using a criss cross pattern the bolts are tightened to the rotor with a torque wrench set to 9 ft lbs.
  10. The rotor is then taken to a machining facility where rotor runout is checked. Those rotors requiring it are trued on a lathe and a small amount of metal is lightly removed from the rotor surface. Finally the rotors are marked with a L or R on the inside braking surface indicating which side of the car they are for.

The kits are then packaged up and labeled for sale. This process is done about once a month depending on sales. Enough kits are kept in stock so they can be sent out within 48hours of purchase. At the same time we do not produce more then we can sell in a month, this insures any changes that may be made in the future does not obsolete the kits we have in stock. A perfect instince of this is the addition of our insignia and patent information on the rotor hat surface in version 1.2 of our kits.

Question: Have there been any problems or concerns with the StopFORCE brake kits?

Answer: There have been no mechanical problems. There was concern on our part about long term rust prevention on the rotor edges which we solved by having the entire brake rotor surface zinc plated.

Question: Is the StopFORCE brake kit safe?

Answer: Absolutely! No modification is done to your OEM brake caliper or mounts. We take your safety as our #1 priority. Tolerences on our brake rotor hats are within 1 thousandth of an inch, exceeding most of the competition.

Question: Will installation of this kit void my GM factory warranty?

Answer: No. Your GM dealership would have to prove without a doubt that installation of this brake kit caused the problem/symptom you are hypothetically experiencing.

Last modified on 3/17/2005