Transcript
Explain it to me like I’m 80
Mom: What’s with these AIs escaping and hacking people? That sounds scary.
Me: You park your car at the top of a hill. You leave a note on the dashboard that says “please be good” and then you pull the parking brake. The car careens down the hill, smashes everything up, and you put out a press release saying “My car ignored my instructions! It hallucinated! It went rogue!” Your insurance company not only believes you, but invests a hundred million dollars in your company.
Mom: Jesus Fucking Christ
Because what happens when you brake in a modern vehicle is that your ABS system modulates the braking pressure and “pumps the brakes” to slow you down evenly and without allowing the brakes the lock up. The parking brake (the manual cable actuated ones) do not do this which causes the brakes the lock up. That’s just simple physics.
The electronic parking brake will not (in any car I have ever driven) stop you if you are moving. It will keep you from moving if you are already stopped but if your vehicle rolls (and say you’ve lost brake pressure because you master cylinder exploded (I dunno, don’t ask me)) your electronic parking brake will not stop you.
The electronic parking brake is a motor that turns a screw that directly compresses the piston into the brake pads. Most cars do this to the existing rear brake pads and it doesn’t require any hydraulic pressure to work.
Some have a separate small caliper with the motor and no hydraulic connection at all.
The motors self adjust by measuring the load from the motor as it clamps down. Then rewinding a set amount when the brake is released. This can make it a pain to replace rear pads, since the screw will be extended too much to fit the new thicker pads/rotor. (You can rewind the screw with a 12v drill battery though and save a lot of time).
If all your rear pads were missing then you’d be screwed though!
And from what I heard the parking brake doesn’t just lock up the wheels… It’s not even connected to the front wheels. So you’re missing most of the braking power. And that’s also a reason why it’s good for drifting.
Wonder how cars with electronic stuff deal with the legal requirement for there to be a second brake available.
Handbrake used to be connected to a second set of brakes in some cars, I had a couple that had 4 disc brakes and then 2 drum brake on the back wheels connected to the handbrake
Lots of airbags and a loud horn /s
The electric one will stop you (but engages all brakes, depending on car model). Have to pull it twice and hold it. Safety feature to prevent accidental engagement.
I take your point but:
The abs pump doesn’t need the mastercylinder, it’s a separate entity further down the brakelines, as long as the system is free of air downstream it’ll work.