Hey Orko,
people say that the brakes of the GS500 are well built.
Actually this is my opinion, too.
So I wonder why you want to try to exchange your pump in order to get better results.
Have you measured your brake-disk? Perhaps the abrasive is too much and that's why you are not satisfied with it. (performance won't be good enough)
You should check the disk and look after any irregularities.
Otherwise -> I don't have any ideas for improving. I guess, radial pumps would be nice, but I did not make any experiences on my own.
But anyways: A new brake disk would be a good start if needed.
Good luck then!
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