Rep Power: 0

Hello,
My manual gearbox needs footsteps on the clutch pedal so I can change gears smoothly without scratching or grinding.
If I go straight from one gear to another It scratches the gearbox, and the gear's teeth. I cannot just step down the pedal once and go from onde gear to another freely and smoothly.

Then, in order to switch gear's smoothly I have to take my foot up totally off the clutch pedal and step it down all over again, so that the exchange gear can sync smoothly again.

What I feel is that if I try to switch gears without having my foot up all off the clutch pedal and stepped it down all over to the bottom again, there won't enough oil or oil pressure in the trasmission so the gears can fit without grinding and scratching It to sync in smoothly.
What should I do?
Civic 98 ex manual. Transmission S40
Thank you

 
Rep Power: 518

Clutch fluid is low?

 
Rep Power: 222

Or maybe a failing slave cylinder?

 
Rep Power: 0

Hi, the fluid is at the bottom of the resevoir filler neck. Its dirty, but is there.
Um having a hard time trying to find a brand new and good quality cilynder, for both Master and slave. The only Brand that seems to be less worst is the Exedy one. But even this one is not a good quality compared to an OEM option, a japanese one.

Could the Master and ir slave cilynder be repaired with this kit:
https://produto.mercadolivre.com.br/MLB-871267366-reparo-de-cilindro-mestre-do-honda-civic-de-1516-pol-_JM

They sell It according to the inches size.
there is 7/8, 15/16, 3/4...
How can i tell How many inches are mine cilynders?
1998 ej8 sedan
Thanks.