I have a 2008 Buick Lucerne CXL and abou 20% of the time the brake pedal will go all the way to the floor before the brakes work, what is the problem? More details below.

Asked by Jun 13, 2016 at 01:10 PM about the 2008 Buick Lucerne CXL

Question type: Maintenance & Repair

My 2008 Buick Lucerne CXL has 86,800 mile on it. I bought it 4 weeks ago
from a dealer with only one previous owner. It drives great is a nice car. the
night we bought it when we got back to our home town about 50 miles from
the dealer the break pedal was very soft and went to the floor before the
brakes would work. The next day the brakes worked just fine. About 80% of
the time brakes work great the other 20% the pedal goes to the floor before
the brakes work. There has never been a brake or ABS warning light. I had
the brakes checked and the pads are good, master cylinder is full and no
leaks in the system. Can someone please help me?

1 Answer

875

You have either: a ruptured vacuum line (or weak line) -or- a malfunctioning brake master cylinder The ABS system may not necessarily detect a master cylinder failure

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