Okay, this problem developed around 2 months ago. When I'm stopped at a light I will have to brake pedal pushed down until firm. Seconds later my car will start to slowly creep up and I have to push the pedal down even more until it gets firm again, in which the pedal is basically towards the floor. After that happens if I immediately release the pedal then pump again it gets firm with little pedal travel at all and doesn't lose pressure. My fluid level and pads are fine so what could the problem be?

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

If I understand correctly what is happening is that you have your foot on the brake and the pedal drops down slowly and it decreases the stopping power?

Have you had any work done on the brakes lately or the car in general?

If the pedal drops slowly and the car does nto stop, it sounds to me like the Master Cylinder. I would ahve this checked out asap! As it can be quite dangerous!

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Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

if you have had brake repair lately it could be that you have air int he system. If you pump the pedal and the pedal rises and stays firm. It is air trapped in the system.

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

The brakes haven't been worked on for at least 25k miles. It's like the system looses pressure and requires more force from the pedal to hold the car still.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

Looks like a faulty master cylinder
About $175.00 plus R & R.
jackd

Master cylinder.

Check to see if any of your calipers need to be rebuilt. I would put on new brake lines while you are at it.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.