Help needed - DBS ceramic brake replacement

[DB9VolanteDriver]

Jon1967x said:

DB9VolanteDriver said:

Rather, the wheel is balanced to offset any rotor imbalance. Once the process is done the first time, balancing a wheel due to a tire change is a simple process that does not require doing anything with the rotor.

I don't understand how thus works. You're implying that a wheel, and it's position on the hub, can be balanced to correct an imbalance in the rotor - I'm ok with that. But take the wheel off, and balance standalone would remove any bias to correct the rotor imbalance. You'd need to both balance the wheel with the same imbalance and fit on the hub in the same position to maintain the correction?

The procedure requires that you first determine the amount and position of the weight to offset the rotor imbalance by mounting the rotor by itself to a Hunter road force machine. This position is marked on the rotor with the amount of weight. You can then balance a wheel/tire combo as per convention and then mount to car. The final step is to add the rotor compensator weight to the wheel directly adjacent to the mark on the rotor. Job done.

[kev b]

Carbon brakes have not dropped down the food chain as far as me yet, so I am interested to know why the discs can't be balanced/marked at the manufacturing stage like steel ones. This would be simpler than having to remove and refit them in service.

Also I had imagined them to be so light that any imbalance would be trivial, how much do they actually weigh?

[V12woollie]

kev b said:

Carbon brakes have not dropped down the food chain as far as me yet, so I am interested to know why the discs can't be balanced/marked at the manufacturing stage like steel ones. This would be simpler than having to remove and refit them in service.

Also I had imagined them to be so light that any imbalance would be trivial, how much do they actually weigh?

Most CCM discs are balanced. The rotor and wheel balancing only has to be done if there is an imbalance once the CCM is on the car. Given the threads on this, it seems maybe ten or so out of the hundreds of DBS and V12V in the UK have had to have the CCMs balanced as well as the wheel. Indeed I thought my vibration was due to the same CCM imbalance until Works Service got my car onto their Roadforce machine and found that, despite two earlier attempts by a dealer, my wheels were not balanced properly. Ten minutes later the imbalance was gone and no requirement to balance the CCM.

[kev b]

Thanks Woolie, I am guessing just a few grammes are needed to balance things up, was this a manufacturing or installation fault?

[V12woollie]

kev b said:

Thanks Woolie, I am guessing just a few grammes are needed to balance things up, was this a manufacturing or installation fault?

It probably won't be much at all, but I do suggest taking the car to Works Service if you can as they are one of the only places in the UK with the Roadforce machine and they can do a much better wheel balance. If the CCM does need matching then it doesn't take long to do, and of course you need to be aware of the CCM balancing weight when you change tyres in the future.

One would expect a perfectly round disc of uniform thickness to be balanced around the central axis but I guess a few get through a gram or two off. Can't see it being an installation fault as there is only one way to fit the CCM, but you would also expect the manufacturing tolerances to be very tight on discs for high performance cars.

[Grant3]

You don't want to take any chances with brakes, so (taken that the car is still ok to drive!) best get (ideally) two more expert opinions on the extent of the damage. This also illustrates why it is worth getting CCM equipped cars inspected by an Aston expert/specialist before purchase. If it does have to be replaced, they are available used from around £1100 each at places like AstonMartin bits, who also list new from £1600 (Ebay etc) but I can't vouch for their condition or the company, so will also be worth shopping around the usual Aston specialists..... Best of luck

[DB9VolanteDriver]

Typical imbalance requires 14 grams (or more) to compensate. Steel rotors are far simpler to balance since the internal structure is more amenable to consistency. A look at the internal vanes of a CCM rotor will clearly illustrate the problem. Since it is essentially molded, the vanes and passages are quite a mess and therefore difficult to maintain consistency. The latest CCM rotors from Brembo have holes taped around the periphery of the hat to accept weights of various sizes to allow the rotor to be balanced post manufacture.

And the problem is far more than just a few DBS or V12V cars, and is/was not confined to AM. However, saying this, it is now mostly behind, partly because of better QC at Brembo and the redesign to accommodate external weights.

[V12woollie]

What Grant said. Ignore us amateurs and get the CCMs looked at by someone who knows what they are doing. Don't skimp when it comes to the brakes.

[yourtheguy]

Have a look on ebay Germany, someone on there is selling a set of 4 discs for 4041 euros.
Alot cheaper than 6.5k for 2.

[Peter 1262]

Hi guys new to this board but I did come across a company in Germany that resurfaces and repairs CCB. Think it was called Rebrake, I'll try find it again and post it.
Cheers
Peter
Actually here it is below

https://www.google.com/url?sa=t&source=web&amp...

[LTP]

Peter 1262 said:

Hi guys new to this board but I did come across a company in Germany that resurfaces and repairs CCB. Think it was called Rebrake, I'll try find it again and post it.
Cheers
Peter
Actually here it is below

https://www.google.com/url?sa=t&source=web&amp...

You did notice that the thread you resurrected was nearly 7 years old? This could be a necro record.

[FredoMusicman]

This can still be usefull ;-)

[LTP]

FredoMusicman said:

This can still be usefull ;-)

A good point, well made

[Phil57DBS]

Much better :

http://www.carbobrake.com/rotors