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This is from a Charger forum & it looks like newer cars with 4-piston Brembos have pads that only sweep about 75% of the rotor's surface. Has anyone noticed this with newer Challengers?


It appears new OEM replacement pads are also smaller.
 

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Rear pad PN has been the same for several MYs (68144223AC), the 'uneven' sweep should go away as the pads wear down beyond the chamfer (assuming there is one, have never taken brand new factory rear pads off myself).

That veh has 1500 miles and those are rear brakes so it'll likely take some time for them to fully seat.

PS - I should mention this ^ is my best guess just looking at the pics (and my own car), will look into it and update if I find anything relevant out there.
 

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not with my '16 the pads sweep the face of the rotors all across
 

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my scat & hellcat both have complete rotor/pad contact...oh and dust. full dust patch contact, no doubt about it !!!!
 

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I actually just cross posted onto the Charger forum. My car has the same weird partial rotor sweep that they're describing on their Charger Scats. I can't make sense of why Dodge would do this unless it's a straight up production error. Here's my cross post:

"My car does indeed have the same partial sweep rear rotor wear that you are outlining in this thread.

Here are my vehicle details:
a. 2019 Plum Crazy Scat Pack Challenger.
b. Mnfr Date 9/19
c. I purchase in Jan 2020
d. Current miles = approx 600"

986249
986250
986251
 

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2019 Challenger R/T Scat Pack Widebody
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Just adding to this string I am sure the discussion will go on for a good long time. I have a 2019 SP WB currently has 700 miles on it and has the same wear pattern on the rear rotors. I have checked the new challengers at the local dealership and they have the same wear pattern. My car runs great stops really well with the 305s and I am not complaining.
Out of interest I checked the official Mopar parts site and found the hellcat brake upgrade package for challengers and while looking at the images provided on the website of the Brembo calipers and rotors I noticed even the new rotor parts only have a partial wear pattern.
I am not saying this is correct nor am I saying it is incorrect never the less the car rides and stops perfectly so I am going to keep on trucking just my 2 cents.
Don’t think I am pleading ignorance however in today’s automotive quality environment I am sure Dodge would have said something or issued a TSB if there were this many cars on the road with incorrect rear brake pads. And if they do in the future we will all get new pads and rotors. Sorry just me finding the positive out of the situation.
 

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While I have zero doubt that it's 'normal', something appears to have changed. Am working to find out what exactly the change was...
 

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I have a 2016 Scat Pack and the pads cover the entire finished face of the rotors. I just rotated my tires and inspected the pads as well as cleaned up brake dust and re-greased the pins, etc.
 

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Enginerd I agree probably normal and I hate to get the thread tracking towards massive engineering calculation BUT, from a technical perspective the coefficient of friction is not impacted by the surface area covered by the brake pad friction material and hence the coefficient of friction is still good for the braking calculation. The braking torque capability however seems to be diminished slightly because the friction material does not use the last 10-12mm of the rotor which would create a larger braking torque moment (Torque = Clamping Force applied by the caliper x effective radius of the rotor in contact with the friction material)
The only downside I see here is the engineers are leaving some braking torque on the table and a weird wear pattern on the rear rotors, if they meet the CFR for all the braking tests then there would no design issue with the setup as is. The chamfer of the rear pads, as aggressive as they may seem, could have been done to correct the noise issues if you still meet the braking requirements you can keep increasing the chamfer on the pads until the noise goes away or customers stop complaining. There are many many threads about rear brake noise / squeal.
Hopefully we get an engineering type from Dodge to give us the full explanation.
 

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What ive noticed is how dirty the brakes get even though there isnt much dirt on our roads. Its not much of an issue other than you gotta clean them a little more often. Also not much you can do about it either but thats just how it is.
 

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I have a 2016 Scat Pack and the pads cover the entire finished face of the rotors. I just rotated my tires and inspected the pads as well as cleaned up brake dust and re-greased the pins, etc.
I guess we need some pad width measurements and rotor machined area width measurements to see which changed (if any)
 

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I guess we need some pad width measurements and rotor machined area width measurements to see which changed (if any)
FYI I have the Powerstop Extreme Z26 pads but before these I had the Wagner OEx pads which also fit like the original Brembo pads. Also using the R1 Concepts Drilled and slotted R1 Carbon Geomet series rotors. Same size as OEM.
 

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Here's the new pads and you can see how much less material that they have compared to my factory 2016 pads.


Sent from my SM-N960U using Tapatalk
 

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I can confirm (officially) a chamfer was added to the top of the rear pads hence the new contact pattern (AC level pads). Not sure if it will go away as the pad wears but that is the new 'normal'.
 

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Well mystery solved then looks like the pads are different and the wear pattern is here to stay, removing the extra material form the pad must have been a bean counter cost reduction. ?
 

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Just a W.A.G. there are 2 different rear pads for the same caliper and rotor based on which front caliper and rotor you have. If you have the 6 piston 15.4" fronts (Hellcat, dynamics,widebodies) then you get the rear pads with more surface area. This is to balance out the larger fronts.
OR they determined that there was some other bias issue with too much rear braking and that was an easy fix.
FWIW, mine look like this.

986305
 
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