Gear crunching my 2002 kia sportage is hard to get in gear i have changed the master and slave cylinder and the pressure plate it seemed to work for a while but now it crunches when getting into gear.

Did you get all the air out of the hydraulic lines and master and slave cylinder, if not the clutch will not fully disengage and you can't go into gear. If this is the case have it vacuum bled.

Umm...

A mechanical 'breaking noise' doesn't sound good. It's hard to diagnose a problem online without being there to see/hear the vehicle. But .. it may be that your clutch pressure plate has broken/ release/throwout bearing has broken?

It's difficult to see why the master cylinder should leak - unless it was incorrectly fitted in the first place?

Just to check ... The master cylinder is in the engine bay/compartment and is where you top up with clutch fluid. When a master cylinder fails it usually results in no pressure at the clutch pedal, not a leak.

The clutch slave cylinder is the one that does all the work. When you press the pedal hydraulic pressure is sent from the master cylinder to the slave cylinder - which then pushes the release/throwout bearing against the clutch pressure plate and 'disconnects' the driven plate .. allowing you to change gear.

The slave cylinder is the one that does all the hard work - it is located somewhere where engine and gearbox mate together, usually at the bottom right/left. It's usually the one that fails/leaks. It's quite easy to replace..

I don't think it is anything to do with reverse gear. It's more to do with the clutch pedal being depressed - and, I would suspect - something has failed.

The link below is generic images of a clutch:
clutch diagram Google Search

Basically, a clutch is 3 parts. There's the 'pressure plate' which bolts onto your flywheel. The pressure plate is a 'spring'. You depress the clutch pedal and the release/throwout bearing presses onto the centre of the pressure plate causing the 'fingers' - the springs - to bend back and take pressure off the driven plate - which is the link - the drive - between engine and gearbox.

If you have a leak your clutch will not work. This causes a 'grinding/crashing' noise when you try to change gear. The first thing you should do is check where the leak is coming from and do something about it.

The 'noise' that you mention may be due to the fact that the gears are 'grinding' as they try to mesh together without the use of the clutch.

The first thing you should do is check why there's a leak. It's difficult to see why a new master cylinder is leaking unless it was incorrectly fitted and damaged (pipes incorrectly connected..).

If it's the slave cylinder that is leaking - replace it. Easy job.

If Master cylinder and slave cylinder are ok - you have to look at your clutch unit. A clutch is always replaced with 3 parts ... throwout bearing/pressure plate and driven disk.

would be wise to replace both clutch master and slave cylinder

Check the hydraulic clutch operation. This is a clutch master cylinder with a reservoir on the firewall, and a clutch slave cylinder down on the bell housing of the transmission, with a steel tube running from the master to the slave cylinder. When clutch pedal is depressed, hydraulic fluid (brake fluid) is forced from the master to the slave. The slave cylinder should push out a little plunger that contacts the clutch fork lever-pushing it forward to engage the clutch.
Add brake fluid to the reservoir if needed. Watch the plunger on the slave cylinder: if it moves little, or not enough, try bleeding the slave from the bleeder valve. They are bled just like brakes. If bleeding doesn't help, your clutch master or the slave may need replacing. The master cylinder, like a brake master, has internal seals that hold hydraulic pressure, so force can be applied to the plunger on the slave cylinder.

Top up your fluid, if it works look for a leak on the cylinder, master and slave

Time for a master clutch cylinder and a slave cylinder

it could be either the master cylinder or the slave cylinder,it could also be the clutch pressure plate check the master & slave cylinders first because if it's the pressure plate the gear box will have to be removed to replace the pressure plate, even if you are uncertain it is most likely cheaper to replace the master & slave cylinders than it would be to replace the pressure plate.....hope this helps......cheers.

The clutch pressure plate might be weak in the manual transmission.

I wouldn't worry if it doesn't cause a problem in changing gears, until you have the clutch changed, if you ever get that far.

did you bleed system?

The spoongy feeling is a defective clutch slave cylinder. Generally a cluthc will not slip because of a pressure issue with hydaulics.

If the clutch is slipping with your foot off the pedal it defineately is time for a clutch job... Best bet is to get it inspected to be sure.