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My car's accelerator doesn't disengage when the breaks are pressed. I've never owned a vehicle that behaves like that. If my car was smart enough to sometimes d

My car's accelerator doesn't disengage when the breaks are pressed. I've never owned a vehicle that behaves like that. If my car was smart enough to sometimes disengage the throttle when I have then break also engaged I can't see a case where this would be less safe than never doing it. If I was intentionally trying to wreak my car or do some weird stunt by simultaneously engaging the break and throttle and the car sometimes tried to stop me I guess it would be annoying.

jordanb 2y ago
ICE cars are designed such that the brakes can always overpower the engine. If you put both pedals on the wall the car will not move. Because electric cars have phenomenal torque, it's not possible to make brakes big enough to stop the car against full application of the accelerator. So they have to have disconnects.
- KennyBlanken 2y ago
  [flagged]
- theteapot 2y ago
  Is there a regulation that states breaks must be able to overpower engine when both are fully engaged - Genuinely asking?
  - notjulianjaynes 2y ago
    I had to fix the emergency brake on my car once because it wouldn't pass the annual safety inspection in my state. IIRC the way it's tested is they engage the brake and then put the car in drive. If it moves under . . . I think it was something like 3k rpm, the car fails the safety check.
    - doubled112 2y ago
      Something about this idea isn’t making sense to me, but I’m not a mechanic. The emergency brake or the brake brake? Maybe you just mean the wheels need not move? I’m almost positive I would just drag the rear end of my car, a boring VW diesel. Did this in some gravel not paying attention, recently. How does this test work in a manual? Standing on the brake while letting out the clutch to see if it stalls is a way to tell if the clutch is dead.
    - jjav 2y ago
      > IIRC the way it's tested is they engage the brake and then put the car in drive. If it moves under . . . I think it was something like 3k rpm, the car fails the safety check. This test won't work at all for a FWD car. The parking brake locks the rear wheels but the front tires are free to rotate under engine power and since on a FWD car most of the weight is on the front axle, the car will happily slide the ligthly loaded locked rear wheels along for the ride.

jordanb 2y ago

ICE cars are designed such that the brakes can always overpower the engine. If you put both pedals on the wall the car will not move. Because electric cars have phenomenal torque, it's not possible to make brakes big enough to stop the car against full application of the accelerator. So they have to have disconnects.

KennyBlanken 2y ago
[flagged]
theteapot 2y ago
Is there a regulation that states breaks must be able to overpower engine when both are fully engaged - Genuinely asking?
- notjulianjaynes 2y ago
  I had to fix the emergency brake on my car once because it wouldn't pass the annual safety inspection in my state. IIRC the way it's tested is they engage the brake and then put the car in drive. If it moves under . . . I think it was something like 3k rpm, the car fails the safety check.
  - doubled112 2y ago
    Something about this idea isn’t making sense to me, but I’m not a mechanic. The emergency brake or the brake brake? Maybe you just mean the wheels need not move? I’m almost positive I would just drag the rear end of my car, a boring VW diesel. Did this in some gravel not paying attention, recently. How does this test work in a manual? Standing on the brake while letting out the clutch to see if it stalls is a way to tell if the clutch is dead.
  - jjav 2y ago
    > IIRC the way it's tested is they engage the brake and then put the car in drive. If it moves under . . . I think it was something like 3k rpm, the car fails the safety check. This test won't work at all for a FWD car. The parking brake locks the rear wheels but the front tires are free to rotate under engine power and since on a FWD car most of the weight is on the front axle, the car will happily slide the ligthly loaded locked rear wheels along for the ride.