Replaced master cylinder in clutch in an attempt to stop the car sticking in gear and moving when foot taken of brake. It still moves while the clutch is still depressed and needs brake to stop vehicle. Volkswagen Bora - Highline 2l, 55 plate

most likely a problem master cylinder with the compensating port blocked
when you press the clutch , it is building up pressure that allows you to start it and to select gears but when you take the foot of the clutch , the fluid cannot return to the reservoir and so you go nowhere
the real fix is a new master cylinder and slave cylinder if the units have not been replaced in the last 5 years

You have not indicated whether your car is a stick shift or an automatic transmission.
If it is a stick-shift, look for a problem with the master cylinder or the slave cylinder on the clutch.
The clutch is actuated by hydraulics, and loss of brake fluid from the system will cause the car to stop shifting.
The master cylinder for the clutch is smaller than the brake master cylinder, and is mounted under the hood (in front of your knees while you are driving).
The slave cylinder is mounted on the transmission near the clutch assembly.
More often than not, the slave cylinder fails before the master cylinder.

If your transmission is an automatic, and the fluid is correct on the transmission dipstick, you may need a transmission overhaul, which can be very expensive.
God bless your efforts.

what would happen if you put it in first gear,put your foot on the clutch then try to start the car....of course pick a place where safe!!!...if it rolls forward while cranking ,the clutch plate is touching the flywheel (in other words the clutch all the way down while in gear while cranking,should NOT touch the flywheel(transmission part that makes the car move) so if it moves then it shows the transmission reacts to the clutch touching the other jiggamathig. Possibly clutch system needs bleeding (air in the hydraulic system). I'm sure your car has this thing called a "clutch slave cylinder". Now,this is one thing I would check first.

your clutch has went out or the slave cylinder to clutch or clutch master cylinder ck master for fluid if low fill and work clutch peddle to pump up slave cylinder if master is full ck at trans to see if slave cylinder is moving if moving clutch in most likely bad and needs replaced.

i think that either your a very bad driver on a manual box or you had a dodgy rebuilt clutch fitted by some back street garage and chances are its the latter

clutch hydraulic system has failed
low fluid levels , air in system,problem clutch master cylinder will cause the indicated problems
take it to a clutch/brake specialist shop and get a proper diagnosis and quote

SOUNDS LIKE CLUTCH MASTER OR SLAVE CYL...BE SURE AND CHECK THE FLUID IN CLUTCH MASTER RESV...IT USES BRAKE FLUID..IF OUT OF FLUID FILL AND WORK THE CLUTCH PEDAL MANY TIMES FULL TRAVEL..YOU MAY NEED TO BLEED SYS.BLEEDER IS NORMALLY ON SLAVE CYL.8 OR 10MM.

Get the clutch slave cylinder and master cylinder looked at.One of the 2 has failed.If the pedal goes to the floor or is very loose,this is very likely the cause.Not an expensive fix.Hope this helps

There is small chance you problem is with the slave cylinder, or the clutch master cylinder.
Check the brake fluid under the hood in the clutch master cylinder. If it is gone, or low, you may be leaking brake fluid either from the slave cylinder on the transmission, or the fluid could be bypassing the rubber seals inside the master cylinder.
I hope this is what is wrong, as it is much less expensive than having the transmission repaired.
God bless your efforts.

There is air in the system. The slave cylinder does provide pressure to return the pedal. Check to be sure that you have plenty of fluid in the master cylinder (clutch). Slowly work the pedal back and forth to try and remove air. (This usually works unless you have really lost all fluid. Once the air is remove depress the clutch while in gear. If it does not keep the car from moving then replace the slave and master cylinder. The parts are a little over $100. Hope this helps. I have one in the shop right now as a matter of fact...