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Sprinter Brake pedal falls away or soft
2. Check the vaccum. You should have 20 to 22 HG at the booster, if the pump is pulling too much the booster actually will pull the pedal away from you. Also inspect the check valve at the booster. I have seen these cracked also.
3. If the vaccum is ok your problem is most likely in the booster.
4. Dont let a dealer talk you into changing the ABS control valve for $2k that will not fix your problem.
5. We are assuming you have inspected the master cylinder for internal bubbles.
Hope this helps.