After replacing my brake pad i started my car and tested my brakes and it was hard and could barely stop, so i thought my brake pad was the wrong size, so when i turn off the key the engine keep running for 4 seconds and then it slowly died down and the engine was off, also the brake pedel will go all the way down when i hold it, I checked my brake booster line and it was ok, what could be the problem, my vaccume lines are ok by the way...

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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??

Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone

GONE, BUT NOT FORGOTTEN
1995 E320 SE 220k mi
1984 300SD 350k mi