Quote:
Originally Posted by Sami Aaltonen
The videoclips thread has been couple of posts about F1's brake noise. That very clearly heard whistling.
Does anyone know why the noise is there?
What it makes up?
The an orginal brakes are Brembos, so they shouldn't never be any bad brakes.
Does the noise couse by the desing of the suspension/chassis? Or brake disc?
And second; the DA book explainded they didn't get the carbon brakes work so they had to sedlle of down steel discs.
Today; many sports cars has carbon-ceramic brakes, is it how much different case than what McLaren tryed get work back 20 years ago?
And third; has anyone uptaded his F1 with carbon-ceramic brakes, changed the steel discs to the carbon discs?
No I don't mean GTR's, the F1 roadcars.
Thanks for the answers!
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It's common for a hard brake pad to squeal against iron discs.
The problem for the F1 brake pad compound is that you need a compound that, in theory, will not fade under repeated 200+mph stops. This means a "hard" pad. At the same time, the F1's design ethos was/is for a comfortable, relaxing, civilised car - one on which the brakes would not normally squeal.
They compromised with a Pagid RS4-2 "Blue" pad. You can find the various Pagid pad characteristics on their website:
http://www.braketechnology.com/racecharacteristics.html
When developing the F1, the team tried to use "carbon-carbon" brake discs. These would have been the same (essentially; there will have been slight differences in resin and fibre) as on the Formula One cars. Their advantage is that they weight approx 1/4 as much as equivalent iron discs.
The problem with carbon-carbon discs is that, when they are cold, their coefficient of friction is too low to create much stopping force. In the morning, you would hop into your road car, drive to the end of your driveway, and brake lightly for traffic - except that, when you pressed the brake pedal, the pads would not bite and the car would carry on into the street. When cold, c-c brakes do not function. Despite spending huge amounts of time and effort to find a way around this problem, the F1 team failed to do so. Once they're hot, c-c discs are very good, but they have to be hot. This is why, during the installation lap of a Formula One race, the drivers run with the brakes partially on, to get heat into them.
The "carbon-ceramic" disc, as made by SGL and Brembo and used on some Porsche and Ferrari road cars, is not the same as carbon-carbon. They both use carbon fibres to hold the disc together, but the carbon-carbon uses an epoxy-type resin to bind it, whilst the carbon-ceramic is bound by silicon carbide.
The carbon-ceramic disc has a bit of a low-temp problem, but with the use of a brake servo it is manageable.
Carbon-ceramic discs weigh 1/2 as much as the equivalent iron, or 2x as much as carbon-carbon.