Here is a pretty decent explanation of Hydroboost.
http://www.dieselplace.com/forum/showthread.php?t=434978
What you describe sounds like your hydroboost unit and if it is leaking you need to buy a new or rebuilt one. They are pretty easy to replace.
SOURCE: water pump replacement procedure 2005 2500 dodge with cummins diesel
take off old water pump. clean up area on the motor real good.do this by using a scrapper and cleaning slolvent. when thats all done put hi temp silicon on the block water pump and the put gasket on silicon. let dry for like five minutes. put in on torque bolts to specs.
SOURCE: 2001 dodge 2500 diesel, leaking
YES.BUT IT IS EASIER AND LESS TIME CONSUMING TO BUY A REBUILT UNIT.
SOURCE: 1999 Dodge 2500 4x4 quad cab diesel. Having tranny
1999 dodge up to 02 can shuttle shift in and out of lockup, most people think it is overdrive but it is lockup. It is caused by tps voltage jumping around. You'll find you will not see it on a scan tool. The dealer has a computer reflash, it doesn't fix the tps voltage bounce but it makes the computer not as sensitive about locking and unlocking the converter clutch with small voltage change at the tps. I had my truck reflashed, but on rare occasions it still does it a bit. Voltage bounce can start around 90,000 miles and continue to get worse with milage. It cost about $90.00.
SOURCE: 2001.5 Dodge Ram Diesel 2500 4x4 Brake Pedal drops to floor
It sounds like you have a bad mastercylinder cause when you panic brake it doesn't have time to bleed through the valve in the cylinder but under normal braking your foot is on pedal longer in turn giving the fluid time to bypass the valve in the mastercylinder in turn the pedal going to the floor.
Testimonial: "thnx"
Loosen bleeder valves on the front
calipers. Attach tubing/hose to the valve. Put other end of tube in
a container with an inch or 2 of fluid (to prevent air from getting
sucked back in)
Top off master cylinder reservoir,
and put cover back on.
Have a helper apply some pressure on the brake, fluid will squirt out of the hose. Then tighten the valve while your helper keeps pressure on the pedal.
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