I was driving to work when the light changed to yellow. I decided to stop (a bit suddenly) and my foot went to the floor and the car went through the intersection.
Luckily, no one was in front of me when it happened. I limped to a parking lot and called AAA; the car is now in the shop.
I just remember thinking, “I have no brakes! Pull over!”
You don’t really even need a catastrophic failure like that. A slow leak will deplete the master cylinder of fluid until at some point you pump air into the lines instead of brake fluid resulting in much excitement.
In my experience though there is a switch inside the master cylinder that is triggered by a float inside the reservoir. When the switch is tripped the brake light comes on. But I suppose stuff can get gummed up and the switch malfunctions.
I lost all braking power on my first car, a 1950 Plymouth. I was 14 and it scared me senseless. It happened just as I turned into the driveway of my parent’s brand new house; I smacked the garage door and cracked it from bottom to top.
No brake light – it didn’t even go on after the failure. I had to creep about a mile for a place to pull over and it didn’t light until then. The guy driving the tow said it’s because there was still fluid at the right level in the master cylinder.
I wasn’t scared, just surprised. Luckily, I was in a spot where I could manage.
Your first thought should have been to pump the brakes. However, in this case, that would not have worked either. It sounds like the valve in your master cylinder crapped out and “bypassed.”
Ever use an old bike pump where you pump and nothing happens? Same thing here only with liquid as the fluid.
Of course you could also have had a failure of the anti-lock brake system.
I tried pumping, but it did no good. I could slow things if I pushed the pedal all the way to the floor, though. That, and driving slowly, got me to a place I could pull in.
My first car (28 years ago) was a dodgy old Volkswagen Beetle (circa 1958), and I encountered the exact scenario that RealityChuck faced. The only things that saved us (I had a baby and a toddler in the car with me) were
a) It was about 10am and therefore just after the early rush-hour on the roads
b) The light ahead was red, but changed to green on our approach and there was no traffic queue waiting.
Otherwise, I’m sure we would have all been very badly injured.
It could probably be done if you cut the line enough to weaken it (but not cut through). Braking creates a lot of pressure, so a weakened line could burst. Of course, it’s not a very good way of accomplishing your goal – there’s no way of being sure when the brakes would fail. Hitchcock did it right in Family Plot – the brake line was weakened when the car was at the top of a mountain and the first time they hit the brakes, it burst.
There was some braking if you pushed the pedal to the floor, enough to stop the car if it was going slowly.