CyberGus

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You only need large brakes after the brakes heat up and they start slipping. You don't need them before that.

-Crissa
Right, if you can put the car into a skid, you have enough brake and not enough tire.
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scottf200

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You only need large brakes after the brakes heat up and they start slipping. You don't need them before that. -Crissa
I think the more surface area the more stopping power.

That is why I mentioned a trailer without it's own brakes (or worn brakes). Starting off first 100% from a campground or at the beginning of a road trip. Also very much keep in minds that because pulling a trailer gets 50-60% range it means that people charge to 100% ... in which they have no regen. I've driven though the Colorado Rockies charging along the way and you need your brakes even without a trailer.

If it comes with small brakes then it is cost saving.

It is a large truck that is supposed to do serious work including towing. This is not a EV car.
 
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scottf200

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The CT brakes make be in line with the X brakes from the pictures.

Out of curiosity I looked up the X and the Ford Lightning. The X is obviously a heavy vehicle with a 100 kWh battery. I wonder how heavy the CT will be with a bigger battery.

The Tesla Model X has front brake rotors that are 14.0"/355 mm. The rear brake rotors are 13.2"/335 mm.

 

Crissa

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I think the more surface area the more stopping power.
This isn't exactly true, as pointed out, there are limits to your tires. As long as the brakes can stop the wheel, that's all that matters. And the brakes on an EV are a backup, you have regen to deal with braking.

...And if a driver start down a tall hill with a big load at 100% charge, they're kind of an idiot.

Either way, like the track, it's an edge case that if you need to do it alot, change out the brakes yourself.

-Crissa
 

PilotPete

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This isn't exactly true, as pointed out, there are limits to your tires. As long as the brakes can stop the wheel, that's all that matters.
Not completely. A larger brake pad and associated surface area offer a chance to get closer to max deceleration without a lock up. Think of using a pad the size of a bandaid. With enough force applied you can lock up the wheel. But modulating the brakes before that point is tough. Additionally, smaller brakes focus the friction energy (heat) into a smaller point, causing higher temps. Larger pads and rotors offer the chance to spread all that out, and offer a chance at leverage vs the smaller rotor/pad combo. You are very correct that regen is doing most of the work, most of the time. And the beauty here is that instead of converting your energy into heat to be dissipated into the air, an EV converts a large part of your energy to electricity, that you get to use later.
 


Crissa

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I would have thought a large brake pad would have a higher chance of lockup. But I guess larger means more surface area for the pressure to be spread against so a different divisor for the force applied... Of course, then you need a pressure source that allow that variance to be used.

Get your master cylinder messed up in an old car and it can be bad in either direction.

-Crissa
 

cvalue13

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One photo is not sufficient to persuade me that Tesla's engineers fail to grasp the art of braking.
I don’t think they fail to appreciate the art of braking, but the ultimate offerings (net net) do tend to be under-performing relative to the speed and weight of the vehicles

It’s a main reason why they offered the ~$20K ‘track pack’ for the S - the stock car set-up could do 1 lap before the brakes were toast.
 

Red61224

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Tesla has tried to pull the wool over buyers eyes with red ones not long ago.
https://www.carscoops.com/2023/01/t...mance-brakes-behind-fancy-red-caliper-covers/


There are many times when large brakes are needed. Low regen when SOC is very high and doing emergency stops or if you live at the top of a mount (various issues have come up in this example). Also doing any multiple sets of track runs with such a heavy vehicle.
I agree, covers are like a "Drug Store Cowboy" no value. The Brembo's I am interested in earn their keep and back it up with performance. Honestly they could have been painted baby crap brown and I would be happy with the job they do. A mechanic buddy of mine has them on a hot rod and I like the double cylinder design and ease of maintenance. Purdy Red paint is just icing on the cake.
 
 




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