Rear brake pads wearing quickly

[Darthbenji]

SR+. I had my tires rotated a couple days ago. I’m just over 20k miles and the rear brake pads are half worn. The fronts are pretty much new. I drove the LR RWD for 18 months and the brakes were almost new when I had twice the mileage as this SR+. My driving style has not changed.
The variables could only be:
less regen on the SR+

hold vs creep mode because I didn’t
use hold on the LR or

autopilot because I didn’t have it on the LR.

Anyone have any guesses as to which is most likely eating up the rear pads?

 

[dfwatt]

SR+. I had my tires rotated a couple days ago. I’m just over 20k miles and the rear brake pads are half worn. The fronts are pretty much new. I drove the LR RWD for 18 months and the brakes were almost new when I had twice the mileage as this SR+. My driving style has not changed.
The variables could only be:
less regen on the SR+

hold vs creep mode because I didn’t
use hold on the LR or

autopilot because I didn’t have it on the LR.

Anyone have any guesses as to which is most likely eating up the rear pads?

Do you see any difference in the appearance between the front and the rear rotors? I know there's supposed to be a little spring that holds the pad just a fraction of a millimeter off the rotor to improve the cars efficiency. If those Springs are broken your efficiency can really drop and you should see that in your consumption but also would mean your rear pads might go more quickly. A Tesla service technician could confirm or give you some kind of diagnosis. There's obviously something wrong.

 

[Occhis]

Is your efficiency (watts/mile) higher than normal? Not sure about the SR+ but I’m guessing it should average around 240. If you’re pushing like 300 then you know the pads are dragging.

 

[Darthbenji]

Efficiency is fine. Today’s drive was 224. It’s been around there most of the summer.

 

[TLLMRRJ]

One thing to check is to make sure the calipers are sliding freely on their slide pins. That would cause excess wear, and that's why cleaning and greasing the slide pins are a routine service item on these cars.

It's also possible that the factory forgot to grease the pins, because you know, they forget to do a lot of things

 

[HenryFarkas]

Efficiency is fine. Today’s drive was 224. It’s been around there most of the summer.

How do you figure out the efficiency?

 

[SigNC]

drive it and try not to brake, get out and carefully feel the rear rotors for warmth.

 

[SlimJim]

I suspect the rear brakes work as eLSD while the fronts don't.
But your LR was also RWD and your driving style did not change.
So I don't know..

 

[Wennfred]

If the rear rotors are hot when you’re done driving, then the caliper slide pins are stuck, need to remove, clean and add some caliper paste like Mission Automotive Silicone Paste.

Fred

 

[TLLMRRJ]

If the rear rotors are hot when you’re done driving, then the caliper slide pins are stuck, need to remove, clean and add some caliper paste like Mission Automotive Silicone Paste.

Fred

Good thinking!

 

[ebmcs03]

What brakes does the hold mode use? All 4 or just rear?

 

[Watts_Up]

One thing to check is to make sure the calipers are sliding freely on their slide pins. That would cause excess wear, and that's why cleaning and greasing the slide pins are a routine service item on these cars.

It's also possible that the factory forgot to grease the pins, because you know, they forget to do a lot of things

I would check if the wheels were rotating freely when the car is raised and in Neutral or Towing mode.

 

[XLR82XS]

What brakes does the hold mode use? All 4 or just rear?

Unless there is a proportioning valve in the brake system - force is applied to all 4 lines.

 

[XLR82XS]

How do you figure out the efficiency?

The left 'card' on the screen shows trip(s) information.

 

[Darthbenji]

Drove to my office just now and rotors cold upon arrival. Efficiency was excellent also.
Any chance the original pads are thinner than the fronts to begin with and if so could this have been introduced since the LR RWD?

 

[MasterC17]

Drove to my office just now and rotors cold upon arrival. Efficiency was excellent also.
Any chance the original pads are thinner than the fronts to begin with and if so could this have been introduced since the LR RWD?

Have you actually measured them? Or do you have photos?

 

[Darthbenji]

Have you actually measured them? Or do you have photos?

Nope