Originally Posted by Sungod

I know physics and I also know reality. I know there is such thing as a 1.0 earthquake on the Richter scale and a 2.0 is 1000 times stronger, but you won't feel either. The difference between the two rotors is miniscule and you are not going to notice the difference.

Originally Posted by Asto

I have successfully upgraded my brakes from the smaller 319mm rotors and calipers (WL/WG) to the larger 338mm Rotors and 13WH Calipers. I figured since my calipers were frozen and I don't know the last time the brakes were done I would start with a clean slate.

**YOU MUST HAVE 17 INCH RIMS TO DO THIS UPGRADE**

Parts Required (Advance Auto Part Numbers)

2x YH145457 (Front Brake Rotors) $60 Each
1x SLC9921 (Left Side Brake Caliper) WH $83+ $50 Core
1x SLC9920 (Right Side Brake Caliper) WH $83+$50 Core
2x 12 Oz Bottle DOT 3 Brake Fluid(I would get one 32oz bottle) $3 Each
1x QC976 Wagner ThermoQuiet Ceramic Pads(You can go with whatever front pads you want. You can even keep your old ones. There is no difference. I just went all new) $53


Total Cost: ~$339 After Cores are Returned. I paid about $250 using Advance Auto Coupons.

Everything mounts up the same. You have to bend the backing plates with a hammer a little. Put on rotor check and make sure nothing hits. Its not much that needs to be bent. Reuse bolts. Grease Pins. Bleed Brakes. Set in new brake pads. I did a few high speed stops.

Results: Amazing. What a difference. I could not believe it. I can now activate the abs. Before not even a chance.


The biggest trouble I had was getting the 2 caliper bolts out since my car is from NY. I had to use a breaker bar. A quick tip, disconnect the caliper hard line to get to top nut on the caliper easier. Makes life easier. Calipers also come with a lifetime warranty!


Here is it finished:

Originally Posted by Cammer

I know this is a very old thread, but I need to correct this misinformation.

I won't bother with the misstatement regarding the Richter scale, but I will say that the difference between the two rotor sizes is definitely not miniscule. If you had calculated the surface area provided by the extra 19mm of diameter you would know this:

Surface area of 319mm standard rotors = 123.8 sq inches
Surface area of 338mm sport rotors = 139.1 sq inches

This is a difference of 15.2 sq inches, which is a 12.3% increase in swept braking area. Also there is greater mass (larger heat sink) which decreases brake fade. Heat is the number one enemy of brake efficiency. Larger rotors will provide lower peak temperatures and longer wear cycles between brake pad changes (lower maintenance costs), as well as significantly better braking ability. All this in addition to the larger rotor giving the brake pad greater leverage and efficiency. So you can see that the larger rotors give advantages on several levels.

The Sport brake upgrade is not miniscule and is absolutely worth doing.