What about the vacuum pump? Can it fail? And if so, are the symptoms the same as a failing brake booster? Christopher J. Thornton 1991 VW Jetta 2 Door 1.6 Diesel - 243k miles 2000 VW Golf 1.9 TDI (turbo diesel) - 111k miles AMSOIL Synthetic Lubricants Dealer #1098500 http://www.amsoil.com