I changed master & slave clutch cylinders in my 88 S10. It was a bear changing the master. I wanted to assemble and bleed before in installed, but couldn’t do it. So I installed and then attempted to bleed when it was in place. It was a royal PITA until I tried bleeding it from the slave, up through the master to the reservoir. I connected a hose from a bottle of fluid up to the open bleeder valve on the slave. Then I used the pump to draw the fluid up through both cylinders to the reservoir. Once air all out, closed off the bleeder valve on the slave and was good to go! That slave bleeder valve is in an awkward location.
A 1997 is no better a twist and lock master cylinder is my ass.. plug in line to the slave is a pain in my ass because off I was expecting it to snap in but hell no
I had to change the clutch slave cylinder because the S10 started having issues with shifting or basically putting transmission into gear. I started noticing hydraulic fluid on the ground. Since it’s a hydraulic clutch the only adjustment or issue you have is bleeding the air out.
Sorry but to answer your question if Replacing both items is highly recommended because of the higher pressure will cause old hydraulic oil seals to leak just like it happened to me.
I drove my S10 home from work and just when I got home it became hard to put into reverse and 1st gear. I checked my clutch hydraulic fluid reservoir and it was empty. I refilled it and it leaked out as soon as I pressed clutch.
