AMG Brakes onto a W203 Sport

[dokalj]

Braided hoses can make a big difference.

 

[IanA2]

Braided hoses can make a big difference.

Yup....I had them put on my G.....huge difference

 

[hotrodder]

Doesn't the c220 cdi with sports package run a Single 57mm piston caliper with 330mm drilled disc brakes on the front?

Wouldnt the AMG caliper's from say a e55k be a benifit? he would have greater breaking power over a larger pad/friction area as i think they are 6 piston?

Also a more leverage being a larger disc?

Adding more pistons and/or calipers with larger pads do not by themselves make brakes 'more powerful'...

Newton's 3rd law states that for every action there is an equal and opposite reaction. Single piston sliding calipers are a perfect example of this but the physics applies just as much when the caliper has opposing pistons in it. Even 6 of them

The clamping force of a brake caliper is a function of the hydraulic line pressure and the total piston area on one side of the caliper. If the caliper piston area is increased in isolation the result is more clamping force at the expense of increased brake pedal travel

Hydraulic line pressure is the result of the force applied to the pedal multiplied by the pedal ratio divided by the master cylinder piston area

Larger brake pads DO NOT make the brakes more powerful as friction is generally independant of area. All they do is take longer to wear out and/or overheat.

The idea behind multi piston calipers is efficiency... several smaller pistons press more evenly on a longer and narrower brake pad. Often the piston sizes are staggered to account for the temp gradient across the pad and prevent the pads tapering as they wear. This longer/narrower pad and caliper are stiffer than a single piston sliding jobby which helps feel (much like braided flexible lines) and increase the torque radius (effective disc diameter)...



Piston area is near as damn it the same for all three examples in the pic. Pad size is the same all round too which obviously wouldn't be the case in real life. Haven't got that CAD file anymore so did another little sketch that shows how a multi piston caliper allows the torque radius to be increased



Stacking two smaller pistones results in an effective 10mm increase in disc diameter. Free gains like that are obviously worth having but larger diameter discs are less about increasing brake torque than heat management and pedal feel*. As said the tyres grip is the limit in 'brake power' until you want to stop repeatedly from high speed and they overheat. Larger disc is a bigger heat sink and has a larger surface area for cooling.

* if you've got much more brake torque than needed you have more wriggle room with things like pedal ratio to improve feel and/or lower the pedal pressure required for a full on ABS stop

 

[KeithJG]

If you don't feel that sport brakes on a 2.1ltr diesel are up to the job you may have a underlying issue, seized caliper (a common complaint) or need a fluid change maybe.

One has to look at more than what you say!

I have the 06 C320 sport as against the PO`s 05 C220 sport but mine has the AMG sport 342mmfront discs with the holes in .....the OP should have 288 discs with no holes....in fact his front discs are smaller than his rear ones @290mm


The reason i know is because having just bought my motor i am checking things out and my front discs were replaced with aftermarket ones so i have been checking catalogues and part numbers.

I don`t why Mercedes don`t fit one brake for C class despite what engine build or accessories the car has?....it seems as though it is the same for all the range....very very complicated

So all in all i can understand why the OP wants better brakes...

 

[Auto-mobile]

One has to look at more than what you say!

I have the 06 C320 sport as against the PO`s 05 C220 sport but mine has the AMG sport 342mmfront discs with the holes in .....the OP should have 288 discs with no holes....in fact his front discs are smaller than his rear ones @290mm


The reason i know is because having just bought my motor i am checking things out and my front discs were replaced with aftermarket ones so i have been checking catalogues and part numbers.

I don`t why Mercedes don`t fit one brake for C class despite what engine build or accessories the car has?....it seems as though it is the same for all the range....very very complicated

So all in all i can understand why the OP wants better brakes...

I disagree, the comment re: his disks will have no holes in is wrong, he will have holes and 4 pot brembo manufactured calipers, your car will have the later design caliper with marginally bigger disks, either way we are not talking a 500+hp v8 going round a track, it's a diesel going around town with quite possibly an underlying braking issue. A fluid change alone could make a noticeable difference.

 

[S92Jockey]

Thanks Keith.. Sensible post....
Checked my brakes and have no 'underlying issue'....
I do have the smaller discs... I've got as much usefully Info from this thread that I think I'm going to get.. Thank you all for your contribution.......