Project Acura RSX, Improving the Stopping Power!

To complement our Stoptech rear brake kit and to completely refresh the brake system on our well-traveled RSX we used some Centric remanufactured OEM brake calipers, part numbers, R caliper P/N 141.40539  L caliper P/N 141.40540.  As a note, these calipers are raw clean iron and will rust quickly unless you paint or clear coat them before installing.

Stoptech’s OEM replacement rotors are made of a special iron alloy with improved high-temperature and coefficient of friction characteristics. They are then machined to tight tolerances and given an anti-rust coating on nonwearing surfaces.  The slots help evacuate water from the disc face and also scrap the boundary layer of vaporized pad material that can form between the pad and the rotor during hard braking, improving the brake action under these conditions. Unlike drilled rotors, slotted rotors will not contribute to rotor heat cracking.

We bled our system using StopTech STR Racing Brake Fluid P/N ST-600.  This fluid has a dry boiling point of 594 degrees and a wet boiling point of 404 degrees.  STR 600 is a DOT 4 fluid which means it is compatible with modern ABS and stability control systems.  It is safe to be mixed with any other DOT4 or DOT3 brake fluids so a full flush doesn’t need to be done if switching over to STR 600.  STR 600 maintains is non-compressibility and lubricity characteristics up to its maximum temperature rating.

We start our installation at the rear of the car by removing the parking brake cable and rear brake lines.

Then the rear caliper can be removed.


  1. I’ve noticed that no one makes 2-piece rotors for stock sized rotors. I would have thought the weight savings from the iron hub will still be worth the trouble, but it seems that the market does not demand for it.

    Any insights on that?

    1. Because it would be pointless to offer something like that. Stock rotors are good if you are running stock sized tires with stock type compounds. When you run more aggressive tires and suspension you quickly overwhelm the stock brakes in track use, with aggressive pads, the car might stop but the rotors will become damaged, rapid wear heat checking and warping.

      1. are S2000 rotors the same as RSX? Cause there are 2pc options for that… although same logic applies as to why its kind of a waste of money…

        1. Yup, anyone who is really serious about tracking the S2000 upgrades to a BBK now. It only took a decade of telling people that, ha. The crowd of, “oh, I just bring spare stock rotors because they crack every two track days” is much smaller now.

  2. Would you recommend going to a bigger rear brake on a FR car with more even weight distribution, or do they tend to do well with just a more aggressive pad as well?

Leave a Reply

Your email address will not be published. Required fields are marked *