Help Service Parts for rear brake pump? It is brembo?

Hi, currently i am reworking all the breakes of the FZR250R.
Most of the brake pistons are stuck. The brake fluid smells like beeing 20Years old and is yelly, sealings are brittle and hard as plastics...

I used the rear brake pump to hydraulically push some of the pistons (rear and front calipers) out, which works better than with compressed air. With this method i found out, that the brake pump cannot apply the pressure it should. The system is free of air with new fluid.
I guess i need some service parts.
Is the brakepump really Brembo as it is stated on the housing -or is it fake??
(I have two FZR250R 89er Model Bikes and they have the same brembo pump?)
Does anybody the Brembo model number th source spare parts or a suitable replacement part?
The company of brembo has not replied so far..

The other brake system is originally Sumitomo like on the 2KR (without label) ?
Any idea for new pistons and sealings?

best regards, spark

 

thanks for confirming that they are original and the spare part number.

 

Hm, okay.
I will contact brembo for original parts, but service centers are sometimes...
lets say better organized with own part numbers than with reverse-search on Bike models.
Do you have any type of brembo-model-id for the pump? I cannot find an id on the housing.
All listings for "FZR250" and "Brembo" are related to discs and pads. No cross reference to other parts.

 

thx. do you know what the supplier of the brake calipers of model version 3ln1 is?
Not any longer sumitomo since 2KR? Do you know a good source of brake cylinder replacements and sealings?
//by the way are they stainless steel or coated?