i cant figure out what is going on. brake res. is full, dont see any leaks around the wheels either. when i apply my brakes sometimes they go way down, but not to the floor and some times when i apply them they are fine. pads are good too. its alittle freaky when sometimes you push them and they catch like they should and sometimes the peddle goes way down. if i pump once or twice before i apply them they work great. wtf? old fluid maybe or flush and pressure bleed job time?
thanks
forgot to add its a 92 190e 2.3

Possible internal leak in the master cylinder

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles

If they are bled properly, I would go with the master cylinder as a possible culprit. When you hold the brake pedal down, does it slowly sink to the floor, or does it hold steady in the same position?

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

its weird really, sometimes they are as strong as they should be and then out of the blue they fade fast, but are still able to stop the car ok. it fades about 3 times out of 10 when i have to use them.

If it's not a vacuum leak then Jerry and Ali are right, it's the master cylinder. Get this fixed before you drive any where. If you don't you will find your car will make a 20' stop in only 18', after that you'll need bodywork and a lawyer.

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Doug
'83 300SD "Old Gold" 170,000 mi.
'82 380SL "Green Machine" 190,000 mi.

Some days you're the pigeon, some days you're the statue... I'd rather be the pigeon!

i didnt think about a vacuum leak, ill check for that also, wheres the vacuum lines at? around the brake peddle?

Vacuum lines runs from the vacuum booster to the intake manifold.

__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record