ajdelange
Well-Known Member
- First Name
- A. J.
- Joined
- Aug 1, 2019
- Threads
- 9
- Messages
- 2,883
- Reaction score
- 2,317
- Location
- Virginia/Quebec
- Vehicles
- Tesla XLR+2019, Lexus, Landcruiser, R1T
- Occupation
- EE Retired
Brakes do get used - just not that much. In particular, bringing the car to a complete stop with the motors is wasteful of energy and so most cars require the friction brakes when coming to a full stop. Also in cool weather regen has to be limited and, unless you revert to the old hypermileing techniques from the over $3.00 per gallon days you will find yourself using the friction brakes on the road. Drivers of BEV encounter as many idiots on the road and you will be slamming on the friction brakes from time to time to dodge them (or the car may do that for you automatically). Finally, torque vectoring can use the friction brake if the motors alone can't handle it completely. This will be less likely in the Rivians with their 4 motors that the other cars with 1, 2 or 3 motors.
Yes indeed, the discs of BEVs do haze over in wet or even highly humid conditions. And you will notice it more because the sound of the pads against the haze isn't obscured by engine noise. The one thing I have not noticed is the friction brakes grabbing when the haze is heavy as they do on some ICE cars. I used to fairly frequently begin a drive with one foot on the accelerator and the other on the brake in order to wipe off the haze and prevent this grabbing. These modern BEVs have got so many sensors that they would certainly be able to detect the haze and perhaps are in fact doing something to remove it but doing it so subtly that the driver doesn't know it. But there would be no need to limit regen until the discs are clean that I can think of.
Going back to the OP: it is interesting to reflect on the relative amounts of fundamentals and emotion in the current price of TSLA.
Yes indeed, the discs of BEVs do haze over in wet or even highly humid conditions. And you will notice it more because the sound of the pads against the haze isn't obscured by engine noise. The one thing I have not noticed is the friction brakes grabbing when the haze is heavy as they do on some ICE cars. I used to fairly frequently begin a drive with one foot on the accelerator and the other on the brake in order to wipe off the haze and prevent this grabbing. These modern BEVs have got so many sensors that they would certainly be able to detect the haze and perhaps are in fact doing something to remove it but doing it so subtly that the driver doesn't know it. But there would be no need to limit regen until the discs are clean that I can think of.
Going back to the OP: it is interesting to reflect on the relative amounts of fundamentals and emotion in the current price of TSLA.
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