the fluid gets contaminated....particles get lodged in one of the cylinders....if you only replace one of them, fluid may get contaminated again. You may notice that most people replace both cylinders at the same time.

I have heard numerous people with experience say that, so Im not just talking out of my ass, but hey, you're the tech here...

 

throw some A/C system dye into the master cylinder...drive around for a few days then grab a trusty black light. Inspect around teh master on the outside and inside of the firewall, then pull the slave off the trans house and inspect again with the black light. YAYAYAYAYAAAAAAAAAY!!

 

Sorry Frosty8, I will no longer speak in this thread. If you need more info PM me.
Yeah I guess I don't know what I am talking about. i have only owned more Honda's than you have had cars, ohh and more cars than you could possibly imagine.. lol

Ohh, BTW you ARE talking out of your....