The check valves on the brake vacuum lines? just ebay vacuum check valves, they're pretty cheap. I think $5 ea.
Though before you go down that road, I'd be checking it isn't the hoses, the valves are pretty simple, hard to break. The hoses are known to rot and crack, you can easily replace most of the vacuum hosts in the car with a couple meters of silicon vacuum hose.
What engine is it?
As for trans slipping I don't know anything about automatics, sorry.
2002 Golf GTI - K03S | 3" Downpipe | 312mm DBA T3 Slotted with Forza Pads | | Forge 008 | Forge Hoses | ECS Performance Mounts | R32 and Urethane Bushings | Pipercross Filter | Sachs VR6 Clutch with 14lb Balanced Flywheel
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