My clutch will not disengage do you think I only need to replace the clutch slave cylinder? Fiat Brava w reg

It sounds like the clutch is not disengaging when depressed. What is the year make and model? It most likely has a hydraulic clutch. Many vehicles have the clutch slave cylinder inside the bell housing of the transmission. This means that the fluid line to the slave cylinder was removed to remove the transmission. If a new slave cylinder was installed when the clutch was replaced (this is a good idea to do when servicing a clutch with a bell housing internal slave cylinder) then the system will need to be bled to remove air from the system and allow the clutch disengagement to function properly.

the 2008 Fiat Palio 1.2 has a self adjusting
hydrualic clutch pedal system

the brake resiviour fluid has to be full
have to bleed the air out of the system at the slave cylinder

if there is a leak or by passed the internals of master or slave
those parts need to be replaced

as per your description problem not clutch since able to start in gear and drive without stall problem sounds more like a fuel delivery not the clutch

check for fluid in the reservoir id hydraulic as it appears as if it needs bleeding
check / replace the master cylinder / slave cylinder
if it is a cable operated clutch then replace the cable.

Clutch disk could be in backwards.
Slave cylinder may have an adjustment that needs to be extended.
Pilot bearing could be bad and keeps the pilot shaft spinning. (simulates clutch not disengaging)
Pivot pin of the throw out arm could be worn down.

Check the clutch master cylinder and the clutch slave cylinder for proper operation... chances are the slave is bad.. I think this is located on the passenger side of the tranny.. you may have lost fluid during the install.. or introduced air into the system.

If you needed a new clutch.. it was probably time to at least flush that system and or replace the slave cylinder.. also check the spring on the clutch pedal..

I hope you replaced the throw out bearing and pressure plate when replacing the clutch.. I suspect you did.

Best of luck

It could be a bad clutch cylinder or a bad slave cylinder. If it is either - the clutch would not fully disengage. This would make changing gears very difficult. If it is the slave cylinder the system should loose fluid and start to drip if you pump it repeatedly. If it is the clucth cylinder it should just seep past the plunger seals and the fluid may not lower. If you put the truck in gear without starting it and push the clutch in - can you push the vehicle? If the answer is no - the clutch is not fully disengaged.

Sounds like a Clutch Slave Cylinder. Check under your front canopy for a small reservoir (looks like a brake fluid reservoir) on the firewall inline with the brake pedal or it may be up under the dash. Check the fluid level. If it is low or empty you could refill it and bleed (drain the air) from the slave cylinder line, found where the transmision and engine connect. Just adding fluid wont fix it, as if it is this simple, you have air in the hydraulic line. This would be an easy fix. However, I think your Slave cylinder failed or you have a more serious clutch replacement ahead. The slave is easy, bolts on and then you just bleed the line as noted before. Any shop could replace a slave cylinder for 2-3 hours of labor. Good luck

Pretty hard to tell you it's a release bearing without hearing it but unless release bearing is in very bad shape & making lots of noise, it's very unlikely that is the culprit here. Does the clutch disengage properly, as in car doesn't creep when pedal depressed? Check master cylinder & slave cylinder movement, perhaps bleeding slave will help, but if it's only in second gear that the problem is occurring then I'd give linkages a real good coat of lubricant & see if that helps at all.

make sure fluid is full... then pump the pedal with it NOT RUNNING as many times really fast as you can.. try it after that, if it works then you need either a clutch MASTER cyliner and/or a SLAVE cylinder.. MOST likely being the slave cylinder. if the pumping action doesnt cause it to disengage then you have a burnt out clutch. The system is hydralic and takes regular DOT3 brake fluid in the small resevoir under the hood next to the brake master cylinder...
The slave cylinder being bad would mean you have to removed the transmission and install a new slave cylinder... thats the most common issue with those around that mileage...