MEMB10TB Melitta Grind and Brew I need a new filter and the top piece that clips down and the steam comes out of.

The thing that comes to mind is the brew unit is blocked and or the grind is too fine. Remove the brew unit and clean the screen under the red o-ring.

Stove top coffee espresso brewers; have three compartments, the lower is a sealed water tank that once heated will push boiling hot water and steam through the coffee grounds and over flow into the 3d chamber at the top of the pot. It is finished once all the water has boiled out of the lower chamber.
* Naturally when you boil water in a sealed chamber it's going to pressurize to the point where something will give. In this case it's the coffee grounds. But what if the grounds plugs up the filter and pressurizes it beyond what the chamber can safely contain? This is where the safety valve will sense the over pressure and release the excess steam. You will see and hear a loud hiss and steam exiting from the side where this valve is.
* The safety valve is not adjustable. Pre-mature blow out (of steam) can be caused by too fine a grind on the coffee, Turkish grind is finer than espresso. This tiny grind will clog all the filter holes. Use the standard espresso grind which is 1 size up from Turkish grind.
* The safety valve may blow if too high a heat is applied to the pot. Turn down the stove to a lower setting to give the hot water and steam time to flow through the coffee. If you observe the coffee as it oozes out of the center post. It should be a steady flow (like lava) with a gush of steam near the end of the brew when the top pot is full.
* The safety valve can get clogged which needs to be cleaned and checked PRIOR to filling and using.
* when in doubt. change out the safety valve. You could check with your vendor or MFR for replacements. Also check Amazon.com for the part.
Aloha, ukeboy57

PS; There a numerous videos on how to clean and maintain these pots. (I do NOT recommend Descaling). Here is one that looks safe:
https://www.bing.com/videos/search?q=stovetop+coffee+cleaning&&view=detail&mid=8AF60938A0B50A2D65528AF60938A0B50A2D6552&&FORM=VRDGAR

Hi If you make a pre-ground shot but don't put any coffee in it, and it does the same thing you have a blockage in the brew head. If it run normally, your grind is to fine. Push the grinder lever to a larger number. It takes 3 times to change to the new grind. If it still dribbles, remove the brew unit (behind the door) Holding the handle, the top left side is the brew head. There is an outlet pipe that exits the backside towards the machine (looks like an "L" pipe). 2screws hold it to the top. Remove the 2 screws while holding the manifold ("L" pipe assembly). Once they are removed, lift the l assembly off (becareful, there is an O-ring, spring and inside a crystal ball (don't loose it or your out of luck). Turn the brew unit upside down while holding the brew head in your other hand and the crystal ball should fall out. If it doesn't come out put a towel down and tap the brew unit on the towel. This should force it out. Now remove the brew screen, by holding the screen with your finger and twisting the thumbscrew (remember thumbscrew, DON'T use the key to install the screen, use your fingers..... Once the screen is out look at where the screen was. There are 2 holes. 1 big one in the center and a small one to the side. With the brew unit upside down over the towel insert a paperclip into the small hole and force anything out the other side. I have gotten worms almost a 1" long from this passage. The paper clip has to go from this side to prevent damage to the seat on the other side. Clean then reassemble. Brew unit on towel right side up. Drop the crystal ball in first. Then the spring small end first on the crystal ba Now the O-ring over the spring, then place the manifold on top of that with the pipe towards the machine. Insert your screws (I turn them backwards a little with a little downward pressure until they feel like they drop into the threads. They should turn down easily, if not back them up a little more ( we are trying to find the old threads) and tighten. Install screen, and tighten with your fingers. The screen just needs to be flush with the bottom of the brew head. Run another pre-ground without the coffee and rinse it out. Do this once in a while to prevent this.

If you make a pre-ground shot but don't put any coffee in it, and it does the same thing you have a blockage in the brew head.
If it run normally, your grind is to fine. Turn the grinder knob to a larger number. It takes 3 times to change to the new grind.
If it still dribbles, remove the brew unit (behind the door)
Holding the handle, the top left side is the brew head. There is an outlet pipe that exits the front side towards the door. 2 screws hold it to the top. Remove the 2 screws while holding the manifold. Once they are removed, lift the l assembly off (becareful, there is a spring and inside a steel ball (don't loose it or your out of luck). Turn the brew unit upside down while holding the brew head in your other hand and the steel ball should fall out. If it doesn't come out put a towel down and tap the brew unit on the towel. This should force it out.
Now remove the brew screen, by holding the screen with your finger and twisting the thumbscrew (remember thumbscrew, DON'T use the key to install the screen, use your fingers.....
Once the screen is out look at where the screen was. There are 2 holes. 1 big one in the center and a small one to the side.
Now use air to blow back through the opening where the steel ball was to clear the opening. Once its open, clean then reassemble. Brew unit on towel right side up. Drop the steel ball in first. Then the spring.
Then place the manifold on top of that with the pipe towards the door. Insert your screws (I turn them backwards a little with a little downward pressure until they feel like they drop into the threads. They should turn down easily, if not back them up a little more ( we are trying to find the old threads) and tighten. Install screen, and tighten with your fingers. The screen just needs to be flush with the bottom of the brew head.
Run another pre-ground without the coffee and rinse it out. Do this once in a while to prevent this.

If you make a pre-ground shot but don't put any coffee in it, and it does the same thing you have a blockage in the brew head.
If it run normally, your grind is to fine. Turn the grinder knob to a larger number. It takes 3 times to change to the new grind.
If it still dribbles, remove the brew unit (behind the door)
Holding the handle, the top left side is the brew head. There is an outlet pipe that exits the frontside towards the door. 2 screws (some have 3) hold it to the top. Remove the 2 screws while holding the manifold. Once they are removed, lift the l assembly off (becareful, there is a spring and inside a steel ball (don't loose it or your out of luck). Turn the brew unit upside down while holding the brew head in your other hand and the steel ball should fall out. If it doesn't come out put a towel down and tap the brew unit on the towel. This should force it out.
Now remove the brew screen, by holding the screen with your finger and twisting the thumbscrew (remember thumbscrew, DON'T use the key to install the screen, use your fingers.....
Once the screen is out look at where the screen was. There are 2 holes. 1 big one in the center and a small one to the side.
Now use air to blow back through the opening where the steel ball was to clear the opening. Once its open, clean then reassemble. Brew unit on towel right side up. Drop the steel ball in first. Then the spring.
Then place the manifold on top of that with the pipe towards the door. Insert your screws (I turn them backwards a little with a little downward pressure until they feel like they drop into the threads. They should turn down easily, if not back them up a little more ( we are trying to find the old threads) and tighten. Install screen, and tighten with your fingers. The screen just needs to be flush with the bottom of the brew head.
Run another pre-ground without the coffee and rinse it out. Do this once in a while to prevent this.

The steam valve needs to be replaced, because the pins have been damaged from high pressure buildup, could have been caused from a very fine grind. You can also check the screen in the brew unit that might be blocked and causing the high pressure backup.

I Googled my question and there was a web site by a lady who has the same machine and on her web site was the 1-800 number where I could order the part over the phone. I went back to find the web site for its address and couldn't find it. Sorry but the # I called is 1-800-947-3745

If the water is not coming out of the filter basket, and is instead leaking over the edges, then replace the brew basket.

If there is no water at all, call Cuisinart - those coffee makers have a 3-year warranty.

One idea to try. I noticed with my grind & brew that the moisture never evaporated from the inside top of the machine. Since that cannot be good over a long term, I have started leaving the top open during the day after I clean the machine in the morning. Your problem is why I started doing that. Why don't you try leaving the top open for a couple of days and see if drying the machine out doesn't cause some of that gunk to dry out?

try replacing water filter