[Simon H]

Had cause to raise an eyebrow yesterday, about the performance of the CCBs, for the first time. Just wondered if this sounds familiar to anyone ?. I suppose my own fault really, but just wanted to discuss. The brakes would have been quite cool, but not stone cold. Hauling down from around 80 mph, hard on the brakes, cool brakes, i didnt actually make the turn i wanted, and had to drive around the bend ahead. They did not stop the car as expected, but i actually think steels would have in this situation. Do you think the CCBs needed to be warmer, or hotter in this situation ?. Been on my mind. I dont feel i was asking too much of them, and i wasnt past the point of no return to make the turn with speed etc

[DryBark]

I've never had anything like that with mine. If anything they grip too hard in most cases.

[Simon H]

Originally Posted by DryBark

I've never had anything like that with mine. If anything they grip too hard in most cases.

The first inch of pedal travel, always needs modulating, because they bite so hard, as though they are over servoed, but yesterday, i really nailed the brakes, and i wasnt over impressed ?.

[aj_g80]

dont forget, you're asking alot of the CCB on the M5. It's still a heavy car. They are good, but it's still 4k pounds.

[subterFUSE]

Every time speed is doubled, stopping distance is quadrupled.

[Demon Barber]

Originally Posted by Simon H

Had cause to raise an eyebrow yesterday, about the performance of the CCBs, for the first time. Just wondered if this sounds familiar to anyone ?. I suppose my own fault really, but just wanted to discuss. The brakes would have been quite cool, but not stone cold. Hauling down from around 80 mph, hard on the brakes, cool brakes, i didnt actually make the turn i wanted, and had to drive around the bend ahead. They did not stop the car as expected, but i actually think steels would have in this situation. Do you think the CCBs needed to be warmer, or hotter in this situation ?. Been on my mind. I dont feel i was asking too much of them, and i wasnt past the point of no return to make the turn with speed etc

I have encountered this if it's been a while since I have really braked hard in them. I find that if you occasionally take a drive on a back road and repeatedly brake hard 4 or 5 times, like you're bedding in new brakes, they then bite much harder and more reliably for a while.

[Maverik259]

I've always heard they're not as good as steel when cold so idk what you define as cool, they don't heat up like steel does so maybe they were cooler than you think? other than that maybe your expectation may need adjusting? I know you say you think steels would have been fine in the same situation but maybe that is just your brain playing tricks? idk.

what were the temps outside?

[Simon H]

Originally Posted by Maverik259

I've always heard they're not as good as steel when cold so idk what you define as cool, they don't heat up like steel does so maybe they were cooler than you think? other than that maybe your expectation may need adjusting? I know you say you think steels would have been fine in the same situation but maybe that is just your brain playing tricks? idk.

what were the temps outside?

You could very well be right, but it would have been the first time ever, i didnt make the turn, i was aiming for. Out side temps were around 12-13". Going to try the braking/bedding in procedure again, and see if this makes any difference. The mega braking performance is still there on light application, like i mentioned, the over servoed feeling, but a mega shove on the brakes, did not produce the goods yesterday.

[Greer]

I have the CCB's and I have never experienced this.

[irablumberg]

Any chance the brakes were damp or wet as well as cool? That combination will limit the performance of CCBs on almost any vehicle. Also, did you try pumping the brakes as that can help eliminate moisture on the discs?

[Simon H]

Originally Posted by irablumberg

Any chance the brakes were damp or wet as well as cool? That combination will limit the performance of CCBs on almost any vehicle. Also, did you try pumping the brakes as that can help eliminate moisture on the discs?

Definitely not wet, or damp. Always garaged, and its been dry here for quite a while.

[Neptune7]

I have noticed the servo issue as well and Harry has pointed it out in his Harry's Garage review on the M5. Interestingly the overall braking with CCB isn't better than the steels in my experience with M5s with both; I had a competition with steels and CS with ceramics. What I found is the initial effect is harder from CCB but I end up roughly with the same stopping distance. Brake fade of course will make an impact but I haven't exercised the car to see that come into play.

[FSHNGRY]

Originally Posted by Simon H

Had cause to raise an eyebrow yesterday, about the performance of the CCBs, for the first time. Just wondered if this sounds familiar to anyone ?. I suppose my own fault really, but just wanted to discuss. The brakes would have been quite cool, but not stone cold. Hauling down from around 80 mph, hard on the brakes, cool brakes, i didnt actually make the turn i wanted, and had to drive around the bend ahead. They did not stop the car as expected, but i actually think steels would have in this situation. Do you think the CCBs needed to be warmer, or hotter in this situation ?. Been on my mind. I dont feel i was asking too much of them, and i wasnt past the point of no return to make the turn with speed etc

One of my first experiences with my CCB's were somewhat similar. I got cut off by someone who decided last minute they didn't want to be in the express lane any longer.

I too, had been driving on the highway (not long at all) and was all gas pedal, very little brake at that point in my trip. I was NOT impressed by the lack of the stopping power for this instance, and this instance only.

I have made it a point to try and give the brakes random "surprise" stops when the situation allows for it in order to properly heat these up.

Since that day, and since warming them up became part of the routine - i agree with others in here... they bite VERY hard. To the point where I sometimes hold my breath and glance at the rear view mirror saying "please God, tell me that person behind me is paying attention"

[micvite]

Just ride the brakes for a quarter of a mile or so, you'll have no issue stopping. Like left foot brake for a bit and problem solved in terms of stopping power at least.

In the case where you missed the turn, did you go foot to the floor? Did abs kick in? If you went to the floor and no abs I'd be concerned to say the least, but if you only went say 40-50% I'd say it's within reason.

[rjhjr]

Just finished running the Arkansas Mile.
Had five stops from 142-150 at the half mile within a forty minute period and always made the first turn out. Had three mile runs ranging from 178-180 shortly after the half miles and always made the second turnout. Then about ten minutes later ran 183 and made the closest turn out. Love the ccbs.

[subterFUSE]

Don't these cars automatically apply light brake to dry them when wet? I thought I heard that somewhere

[lemetier]

Originally Posted by Simon H

Had cause to raise an eyebrow yesterday, about the performance of the CCBs, for the first time. Just wondered if this sounds familiar to anyone ?. I suppose my own fault really, but just wanted to discuss. The brakes would have been quite cool, but not stone cold. Hauling down from around 80 mph, hard on the brakes, cool brakes, i didnt actually make the turn i wanted, and had to drive around the bend ahead. They did not stop the car as expected, but i actually think steels would have in this situation. Do you think the CCBs needed to be warmer, or hotter in this situation ?. Been on my mind. I dont feel i was asking too much of them, and i wasnt past the point of no return to make the turn with speed etc

[QUOTE=Simon H;28835199]

This is normal. Cold CSiC Brakes (<300°C) at moderate speeds and application below ABS threshold have a lower deceleration rate than M Compound despite a markedly sharper initial bite.

Originally Posted by Maverik259

Going to try the braking/bedding in procedure again, and see if this makes any difference. The mega braking performance is still there on light application, like i mentioned, the over servoed feeling, but a mega shove on the brakes, did not produce the goods yesterday.

Don't use "bedding-in" with MCCB, especially when new. Long, light application from motorway speed down to 35mph/55kph 3 times in a row is appropriate.

Originally Posted by subterFUSE

Don't these cars automatically apply light brake to dry them when wet? I thought I heard that somewhere

Brake Drying is [COLOR="DarkRed"]DISABLED[/COLOR] with MCCB.

[Hammer110!]

Originally Posted by Simon H

Had cause to raise an eyebrow yesterday, about the performance of the CCBs, for the first time. Just wondered if this sounds familiar to anyone ?. I suppose my own fault really, but just wanted to discuss. The brakes would have been quite cool, but not stone cold. Hauling down from around 80 mph, hard on the brakes, cool brakes, i didnt actually make the turn i wanted, and had to drive around the bend ahead. They did not stop the car as expected, but i actually think steels would have in this situation. Do you think the CCBs needed to be warmer, or hotter in this situation ?. Been on my mind. I dont feel i was asking too much of them, and i wasnt past the point of no return to make the turn with speed etc

Took friend out for hot lap around the clover leaf. Exited last ramp (#4) at speed and accelerated briefly over the overpass. Hit brakes to make turn via turn lane at median and got nothing. Cold brakes.... just shot past that turn through to the next turn through. Hard acceleration to then next ramp taking back home and brakes worked great after getting warmed up in the first attempt. I’ve had it happen a few times and my brakes are not glazed over.

[shawnhayes]

Getting the M5 CS with CCB's was something I did NOT want to do, but there is no option.

The thing I can echo from your experience is "inconsistency". When cold - no stop so well. First stop - no stop so well. Multiple brakes during the last lap - slow down from 160-60, brake fade compensation that you can obviously feel - no stop so well.

Other times, properly warmed up, proper point in the lap, proper last second trail braking - makes your effin' brain push your eyeballs forward in the helmet.

It is what it is. But you appear right.

Shawn

[Simon H]

Thanks for the replies and discussion chaps. Looks to be quite usual, what i experienced. Will definitely warm the CCBs up, going forward. If im honest, ive owned the car a year now, and only just started giving the car some stick, this second year, so probably still on a learning curve with the CCBs etc, but great to be able to discuss this kind of thing here

[JOHNBMWM5]

Looks like low miles infrequent use to me Simon, they just aint settled yet. Mine are great after 3500 miles, getting better.

[Simon H]

Originally Posted by JOHNBMWM5

Looks like low miles infrequent use to me Simon, they just aint settled yet. Mine are great after 3500 miles, getting better.

Could be right John, will be trying this situation again, but get the brakes much warmer first. All a learning curve