F80 @ New Hampshire Motor Speedway

[MasterC17]

Originally Posted by MaynardZed

I feel for you guys in cold weather areas. I'm almost finished with the first half of the 2015 season here in Phoenix. Just three more track events left, then our "off season" is from Memorial Day to Labor Day due to the heat.

Our season doesn't start till April/May and generally wraps up in September/October. I'm jealous of your longer schedule haha.

[gsrbri]

What were you running for brake pads? I was at the same event at you (gray M4), albeit in Run Group 2, and had very good luck w/my brakes - although I was trying to nurse tires, so wasn't hammering on it. From the smoke coming from your front brakes during the drive through the paddock, saw some serious heat in that caliper. My braking was tire-limited (my R Compounds had a fitment issue so I couldn't use them), but I am running Pagid RS29 with RBF600 and the brakes managed the heat fairly well. Didn't have a lap timer, so can't compare lap times. I was running DSC-Off and stock tire sizes. My R compound are CCW's with 275 front and 305 rear. That may impact braking...your set-up is definitely providing more traction. Curious to some of your further inputs.

[MasterC17]

Originally Posted by gsrbri

What were you running for brake pads? I was at the same event at you (gray M4), albeit in Run Group 2, and had very good luck w/my brakes - although I was trying to nurse tires, so wasn't hammering on it. From the smoke coming from your front brakes during the drive through the paddock, saw some serious heat in that caliper. My braking was tire-limited (my R Compounds had a fitment issue so I couldn't use them), but I am running Pagid RS29 with RBF600 and the brakes managed the heat fairly well. Didn't have a lap timer, so can't compare lap times. I was running DSC-Off and stock tire sizes. My R compound are CCW's with 275 front and 305 rear. That may impact braking...your set-up is definitely providing more traction. Curious to some of your further inputs.

I was running CarboTech XP10's. The pads were fine, but the brake fluid didn't hold up (RBF600). They certainly did get hot though! I'll be switching to Castrol SRF for brake fluid, and if that doesn't fix it, be swapping to XP12's for pads.

[FTS]

Originally Posted by MasterC17

I was running CarboTech XP10's. The pads were fine, but the brake fluid didn't hold up (RBF600). They certainly did get hot though! I'll be switching to Castrol SRF for brake fluid, and if that doesn't fix it, be swapping to XP12's for pads.

I haven't seen rotors change color this dramatically after a single event (assume this was the first one with the car). It may be worth to put titanium back plates behind the pads or maybe even titanium pistons if any available.

My worry wouldn't be just the fluid, SRF may be sufficient, but with a caliper that heats up that much, the continuous expansion and contraction of the caliper may yield serious deformation. Then again, maybe the paint quality BMW used is subpar

[Gearhead999s]

Originally Posted by MasterC17

I was running CarboTech XP10's. The pads were fine, but the brake fluid didn't hold up (RBF600). They certainly did get hot though! I'll be switching to Castrol SRF for brake fluid, and if that doesn't fix it, be swapping to XP12's for pads.

Did you do any cool down before you came in to the pits?Usually I try to do at least a full lap at moderate speed with no brake application before entering the paddock.The only time I had issues with soft pedals on my E92 M3's was when I did not follow this procedure or a red flag happened and there was no cool down period.I usually run BMW Dot 4 fluid and I am quite aggressive with my braking.

[MasterC17]

Originally Posted by FTS

I haven't seen rotors change color this dramatically after a single event (assume this was the first one with the car). It may be worth to put titanium back plates behind the pads or maybe even titanium pistons if any available.

My worry wouldn't be just the fluid, SRF may be sufficient, but with a caliper that heats up that much, the continuous expansion and contraction of the caliper may yield serious deformation. Then again, maybe the paint quality BMW used is subpar

I'm not particularly excited about how hot the brakes got, but the car should be able to take the abuse. We'll see how it fairs with the SRF. If it still is a problem, may need to look into a BBK.

Originally Posted by Gearhead999s

Did you do any cool down before you came in to the pits?Usually I try to do at least a full lap at moderate speed with no brake application before entering the paddock.The only time I had issues with soft pedals on my E92 M3's was when I did not follow this procedure or a red flag happened and there was no cool down period.I usually run BMW Dot 4 fluid and I am quite aggressive with my braking.

Yea we always got a cool-down lap at the end of sessions.

[gthal]

Originally Posted by MasterC17

I'm not particularly excited about how hot the brakes got, but the car should be able to take the abuse. We'll see how it fairs with the SRF. If it still is a problem, may need to look into a BBK.

Yea we always got a cool-down lap at the end of sessions.

I cannot imagine it would be needed. There are lots of people here with racing pads and fluid and no issues. Guys running R888, NT01 and other very grippy tires with no issues. I boiled the OEM fluid in my E92 M3 but no issues at all with the F82. If you have an issue with SRF, then there is something else going on because I have never heard of someone overheating SRF.

[MasterC17]

Originally Posted by gthal

I cannot imagine it would be needed. There are lots of people here with racing pads and fluid and no issues. Guys running R888, NT01 and other very grippy tires with no issues. I boiled the OEM fluid in my E92 M3 but no issues at all with the F82. If you have an issue with SRF, then there is something else going on because I have never heard of someone overheating SRF.

Agreed, I expect the fluid will solve it.

[okroger]

sounds like a great day up there nonetheless. ive done nhis quite a bit on a moto and a few times with my old e92, and really looking forwarding to winding out in the f80. surprised to still see so much snow in the infields

[Ryan239]

NHMS is pretty tough on brakes, not a lot of time to cool them down between t3 and t6. Looks like you had some pretty big steering wheel corrections in a few spots; I couldn't tell how much the car was moving around but I would imagine you were sliding around quite a bit?

Last time at NHMS was not as fun for me; the n55 in my 1 series spun a bearing in the braking zone for t3, and I wound up getting a ride on the hook back to the pits. I had stock runflats so my steering inputs were similar to yours

[CSBM5]

Originally Posted by FTS

It may be worth to put titanium back plates behind the pads or maybe even titanium pistons if any available.

Ti plates for sure. This will significantly reduce heat transfer from the pad through into the piston and caliper. Not only will it lower caliper and brake fluid temperatures, but it will save your piston dust covers *and*, importantly, the piston seal. Way back in the old days, running PFC01s and R-comps on my E39 M5, I baked the dust cover almost away and actually melted a piston seal -- not fun.

The Ti plate is a wonderful solution, and I've used them for over 10 years now with great success. They are especially helpful as pad thickness wears down (since the pad material is an excellent insulator (very low thermal conductivity) since backing plate and hence piston temperatures are a direct (linear) function of pad thickness.

Regards,
Chuck

[MasterC17]

Originally Posted by Ryan239

NHMS is pretty tough on brakes, not a lot of time to cool them down between t3 and t6. Looks like you had some pretty big steering wheel corrections in a few spots; I couldn't tell how much the car was moving around but I would imagine you were sliding around quite a bit?

Last time at NHMS was not as fun for me; the n55 in my 1 series spun a bearing in the braking zone for t3, and I wound up getting a ride on the hook back to the pits. I had stock runflats so my steering inputs were similar to yours

Sucks to hear about the N55 bearing issue, seen it a few times now on N54/N55, hopefully S55 doesn't have this problem. And yes the car is very torquey so it likes to oversteer quite a bit - but a lot of fun haha!

Originally Posted by CSBM5

Ti plates for sure. This will significantly reduce heat transfer from the pad through into the piston and caliper. Not only will it lower caliper and brake fluid temperatures, but it will save your piston dust covers *and*, importantly, the piston seal. Way back in the old days, running PFC01s and R-comps on my E39 M5, I baked the dust cover almost away and actually melted a piston seal -- not fun.

The Ti plate is a wonderful solution, and I've used them for over 10 years now with great success. They are especially helpful as pad thickness wears down (since the pad material is an excellent insulator (very low thermal conductivity) since backing plate and hence piston temperatures are a direct (linear) function of pad thickness.

Regards,
Chuck

Good to note, will look into a set, thank you.

[CSBM5]

It doesn't look like they have an F8x application yet, but Hard Brakes is likely to produce them if there is enough interest (or they may already have plans). No affiliation with them other than to say a bit over 10 years ago I provided some unpaid consultation to the guy who started it (not sure if still owned by him or not).

[MaynardZed]

Originally Posted by FTS

Nice driving MasterC

You are far more comfortable with the car than I am

For those that don't like the standard Blue caliper color, you found an easy way to turn them into green without taking them off and painting

LOL, just cleaning up my M4 for a track day tomorrow and noticed my front calipers are a shade of greenish/gray also. Definitely not blue anymore like the rear calipers. I guess I assumed for awhile it was just brake dust on the calipers, but now that they are clean its obvious they have changed color. Melted an APEX center cap that I forgot to take out too.

Supposed to be 98 degrees F tomorrow. I wonder what color they will turn next?

[Nugget]

Originally Posted by MasterC17

And I turned my right front caliper from blue to green

Big thread dig, but it looks like brake fluid is leaking out the threads of the bleed screw.
I noticed this on one of my calipers during a track day, I replaced the bleed screw and it still happened.
Is this something that could compromise braking enough to be dangerous?