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this post was submitted on 21 Aug 2023
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"Brake by wire" doesn't mean there isn't a mechanical linkage, just that the "primary" means of transmitting brake pressure is electrical.
Between safety regulations, liability, the the potential for a PR disaster there isn't a single road legal car for sale (yet) that doesn't have a backup hydraulic or other mechanical system -- the brakes must work if there's a catastrophic electrical failure.
Goddamit my whole life i thought by wire meant like physical tensile wires, that the power was transmitted through tension in the wires. Never realized theyre talking about electronic systems where the information is transmitted electronically.
I can't find which, but some vehicles seem to not have mechanical backup.
https://en.m.wikipedia.org/wiki/Brake-by-wire#:~:text=Ford%2C%20General%20Motors%2C%20and%20most,Motors%20Electric%20and%20hybrid%20models.
https://www.mdpi.com/2227-9717/11/4/994
https://www.sae.org/publications/technical-papers/content/981109/
EHBs are fairly common, but they don't preclude the use of a backup master cylinder system. A pure EHB has been a "goal" for a long time since eliminating the master cylinder and linkages would simplify design and manufacturing cost. So far nobody has been able to convince regulators or their legal team they can sell a car without one, though.
Pure electrical throttles have been the standard for a while now.