E500 Calipers
If you really want to do this, I suggest trying the E500 calipers first. If it doesn't work for your rotors, then just get new rotors. I think the rotors are about $150 for the pair of regular rotors, and $200 for the pair of sport package rotors. Not terribly expensive considering what you might be paying for calipers.
If you're changing your calipers/pads anyhow, I would hope you would change your rotors at the same time.

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E320
Brakes 4-circuit electrohydraulic brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E320 CDI
Brakes 4-circuit electrohydraulic power-assisted 4-wheel disc brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E500
Brakes 4-circuit electrohydraulic brakes. 13" ventilated front discs. 11.8" ventilated rear discs. 4-piston fixed front calipers and single-piston floating rear calipers.
As you noticed, E500 are using different kind of rotors. Size different for front rotor and ventilated or solid rotor for the rear.
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E320
Brakes 4-circuit electrohydraulic brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E320 CDI
Brakes 4-circuit electrohydraulic power-assisted 4-wheel disc brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E500
Brakes 4-circuit electrohydraulic brakes. 13" ventilated front discs. 11.8" ventilated rear discs. 4-piston fixed front calipers and single-piston floating rear calipers.
As you noticed, E500 are using different kind of rotors. Size different for front rotor and ventilated or solid rotor for the rear.
I just checked the rear discs on my E320 CDI and they are definately ventilated and the fronts are definately 4-Pot calipers and larger discs than my neighbours E220 CDI.
Last edited by marcos; Jan 2, 2005 at 04:33 PM.
I was dismayed to discover that the much faster and heavier E320 CDI comes with brakes that are inferior to the BMW 528i it replaced.
E320
Brakes 4-circuit electrohydraulic brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E320 CDI
Brakes 4-circuit electrohydraulic power-assisted 4-wheel disc brakes. 12.3" ventilated front discs. 11.8" solid rear discs. Single-piston floating front and rear calipers.
E500
Brakes 4-circuit electrohydraulic brakes. 13" ventilated front discs. 11.8" ventilated rear discs. 4-piston fixed front calipers and single-piston floating rear calipers.
As you noticed, E500 are using different kind of rotors. Size different for front rotor and ventilated or solid rotor for the rear.
The E320 with sport package is supposed to have different brakes, too. I am not sure if any genuine sport packages have been available in the USA though.
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