i have got a 1.6 esi vtec 91 civic and yesterday whilst driving i shifted gears and my clutch went down and didnt come bk up wen i let go of it i switched off my car and tried again and it worked but about 5 mins later it happened again and now it doesnt go into gear and if i push the clutch down it makes a loud squeeling noise and revs drop please help thanks

 

check the fluid in your reservoir its the tiny one next to your brake fluid.. if its out fill it up with dot3 brake fluid most likely your slave cylinder is leakin a little bit

 

scenerio 1:
look and see if the fluid is low. if it is peel the boot back on the slave and see if it is wet, if it is, replace BOTH slave and master (if it hasnt been doen prior)

scenerio 2:
again check fluid level if it is low, look on the floor neac the clutch pedal, if it is wet, the master is leaking EXTERNALLY
if it is see result from #1

scenerio 3:
look both places, and dont see any fluid leaks, put hand on pedal and see if it sinks.
if it does, see result from #1.

i only say that because if they are old, a new one will compromise the other. i always do them in pairs, unless the customer tells me otherwise.