[M2joey]

This is a great article that covers pretty much everything you might ask in regards to the M Sport brakes.

"Interview with M engineer Klaus Dullinger on the new brake system for the BMW M3 and M4'

http://www.bmwblog.com/2014/04/13/ne...-brake-system/

[Spartan King]

Originally Posted by isjoey

This is a great article that covers pretty much everything you might ask in regards to the M Sport brakes.

"Interview with M engineer Klaus Dullinger on the new brake system for the BMW M3 and M4'

http://www.bmwblog.com/2014/04/13/ne...-brake-system/

Good info, thanks for the link.

[ZM2]

He didn’t mention their magic caliper paint color changing abilities on track.

[M2joey]

Originally Posted by ZM2

He didn’t mention their magic caliper paint color changing abilities on track.

Turns out I changed my rotors and pads last weekend. I also discovered this bit of beauty...

[Noel911]

Interesting quote in this article about the color change of the caliper paint as it relates to cooldown. BTW, I assume they are talking Celsius.

"It is very important for the material in the brake components to have time to cool down in an air stream. If you park your car while temperatures of 500 degrees are still prevailing on the brake discs, the considerable heat will be transferred throughout the entire brake system. And the brake pads too will absorb energy from the hot brake discs. The heat transfer progresses through the back plate and damping plates of standard pads into the brake callipers. In addition to the damping layer of the damping plates, the piston seals and dust shields can also be damaged, as can the surface coating of the brake callipers. Leaving brakes to cool in a stationary position is extremely unfavourable when brake discs are at a temperature of up to 500 degrees. By performing a cooling-down lap, the brake temperature generally falls to below 200 degrees.:

[ZM2]

I can tell you from experience the issue isn’t cooldown, it’s the brakes are inadequate for seasoned drivers and they get too hot.

I was routinely doing a cool down lap and continuing cool down by driving out of the paddock to sideroads to get temps down. My calipers still got torched.

I think it’s all down to pad size. If the pads had more surface area, temps wouldn’t get as high.

[horsepower_and_hounds]

Wow I would have thought the insides would get hotter and discolor faster than the outer. Weird .... maybe the inner side has more airflow than we know

[M2joey]

Originally Posted by Noel911

Interesting quote in this article about the color change of the caliper paint as it relates to cooldown. BTW, I assume they are talking Celsius.

"It is very important for the material in the brake components to have time to cool down in an air stream. If you park your car while temperatures of 500 degrees are still prevailing on the brake discs, the considerable heat will be transferred throughout the entire brake system. And the brake pads too will absorb energy from the hot brake discs. The heat transfer progresses through the back plate and damping plates of standard pads into the brake callipers. In addition to the damping layer of the damping plates, the piston seals and dust shields can also be damaged, as can the surface coating of the brake callipers. Leaving brakes to cool in a stationary position is extremely unfavourable when brake discs are at a temperature of up to 500 degrees. By performing a cooling-down lap, the brake temperature generally falls to below 200 degrees.:

Celsius - yes.

This is all very true, cool down time is very important. You never want to just "stop" with hot rotors. As in hot during or right after a session on the track. If there is a red flag on the track, you need to pull over and stop ASAP, or course. That is bad!

The calipers will turn almost complete black in extreme cases.

[M2joey]

Originally Posted by m2ruder

Wow I would have thought the insides would get hotter and discolor faster than the outer. Weird .... maybe the inner side has more airflow than we know

The outside pads on the front are worn more too.

[M2joey]

Originally Posted by ZM2

I can tell you from experience the issue isn’t cooldown, it’s the brakes are inadequate for seasoned drivers and they get too hot.

I was routinely doing a cool down lap and continuing cool down by driving out of the paddock to sideroads to get temps down. My calipers still got torched.

I think it’s all down to pad size. If the pads had more surface area, temps wouldn’t get as high.

It is interesting as I have seen some hard braking (right in front of me) lap and lap with another M2 with OEM pads. There was no discoloration on the calipers after the season. Pad compound of course certainly plays a part too.

I agree on brakes for the track driver. BWM should have offer the M Carbon Ceramic brakes as an option. I would have tempted myself.

[dvas]

Originally Posted by ZM2

I can tell you from experience the issue isn’t cooldown, it’s the brakes are inadequate for seasoned drivers and they get too hot.

I was routinely doing a cool down lap and continuing cool down by driving out of the paddock to sideroads to get temps down. My calipers still got torched.

I think it’s all down to pad size. If the pads had more surface area, temps wouldn’t get as high.

Agreed. Also spent a considerable amount of time driving in circles in the paddock to help further cool down the brakes after a full cool down lap. Brake calipers turned greenish brown anyways.

[SimNugget]

BMW should just have some cooling ducts in the front wheel arches like they have placed on most 3 Series and Minis - lord know they didn't on the M2!