Hi there,

This can be a faulty brake booster, a basic test is to pump the brakes with the engine off, then holding down the pedal, start the engine, if the booster is working you should feel it suck down a little as the vacuum takes over, check this out.

mark (mhpautos)

Answered by mhpautos (expert)
27,079 answers provided

Mark:
When the brake booster go's, could it cause you to have to stop the car with the emergency brake? That's what I had to do. The pedal stayed high & hard with no braking.

Response from robertsmith
1 question asked

This is sounding like a failed booster, did you try the test?

Mark.

Answered by mhpautos (expert)
27,079 answers provided