Why do automatics need a brake shift interlock?

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Discussion Overview

The discussion centers on the necessity of the brake shift interlock in automatic vehicles, exploring its safety implications and mechanical reasoning. Participants consider whether its absence could lead to damage or accidents, and some express preferences for manual control features in automatics.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • Some participants suggest that the brake shift interlock is a safety feature to prevent accidents, particularly in the context of driver error.
  • Others question the mechanical necessity of the interlock, proposing that it is not required for the vehicle's operation.
  • A participant raises a hypothetical about controlling the fluid clutch in an automatic with a clutch pedal, suggesting it could enhance driving experience.
  • Another participant challenges the practicality of decoupling the turbine wheel from the pump wheel when the clutch pedal is pressed, arguing it would effectively put the car in neutral.
  • There is a mention of regional differences in the application or necessity of the brake shift interlock, specifically referencing Australia.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and functionality of the brake shift interlock, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Some arguments depend on assumptions about driver behavior and vehicle design, and there are unresolved questions regarding the mechanical implications of removing the interlock.

marellasunny
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In automatics,one needs to press the brake (i.e the brake shift interlock switch) to shift the car out of park. What damage would happen if the brake shift-interlock wasn't present. Has it got something to do with the Fottinger fluid clutch? i.e with the automatic "creep" effect?
 
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Because without it Americans would press the wrong pedal and run over their children.

See: Audi 100/5000
 
Last edited:
As far as I know, it's purely a safety feature - there's really no mechanical reason it has to be present.
 
Because you can't fix stupid...but we do let them have cars.
 
Haha.Nothing beats a clutch pedal though.If only one could control the functioning of the fluid clutch in a automatic with a clutch pedal.Does something like that exist?Automatics feel tasteless for some reason.
So my idea is to decouple the turbine wheel from the pump wheel when the clutch pedal is pressed,much like the functioning of the hydrodynamic retarder.
 
marellasunny said:
Haha.Nothing beats a clutch pedal though.If only one could control the functioning of the fluid clutch in a automatic with a clutch pedal.Does something like that exist?Automatics feel tasteless for some reason.
So my idea is to decouple the turbine wheel from the pump wheel when the clutch pedal is pressed,much like the functioning of the hydrodynamic retarder.

To what purpose? All it would achieve would be to basically put the car in neutral whenever the pedal was engaged.
 
marellasunny said:
In automatics,one needs to press the brake (i.e the brake shift interlock switch) to shift the car out of park. What damage would happen if the brake shift-interlock wasn't present. Has it got something to do with the Fottinger fluid clutch? i.e with the automatic "creep" effect?

Apparently you haven't been around very long. LOL. Or, I may be giving my age away.
 
marellasunny said:
In automatics,one needs to press the brake (i.e the brake shift interlock switch) to shift the car out of park. What damage would happen if the brake shift-interlock wasn't present. Has it got something to do with the Fottinger fluid clutch? i.e with the automatic "creep" effect?

Not in Australia.
 

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