Poor power brake assist and poor mileage

Having problems with intermittent power brakes and it is getting more common. Also notice a loss of MPG. From searching it sounds like it might be the common problem of the vacuum hose to the booster.

Before just buying the part can someone point me in the direction of how to test and find where the problem lies for sure? The part I suspect (based on searching) is 1J0612041GD.


Thanks!
Jason

I think this can be caused by any leaky vac line.

I believe there is also a hard hose that you can visually check for cracks. Honestly, vac line should only cost around $10, I would just replace all the vac-lines and see if that fixes it. If not, start looking at the hose to the booster.

Check the hard line going to the brake booster to the VAC pump off the head, very common for these to develope a crack and when the engine warms up it gets worse, looks something like this,



and here's where you can purchase one,

http://www.tdiparts.com/catalog/product_info.php?products_id=785


as for the poor MPG, , could be anything really