Premature rear brake rotor wear

[Pure Michigan]

Further more, my 2013 CMax SE hybrid and 2019 Fusion Titanium hybrid DO NOT HAVE A PREMATURE WEAR ISSUE!

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[ianjay]

I used to have a 2019 F150 Lariat and the electronic rear locking differential used the rear brakes to actually do the "locking" . It was very common on the F150 forums for owners to report what they considered to be premature wear on the rear rotors and pads (20K miles for example) even though the front rotors and pads were still fine. Since most of the normal braking is done by the front brakes, discovering that the rears are worn out was annoying.

 

[Reidles]

I’m joining this club…
Just rotated tires at 10,000km / 7000miles and the rear pads are down to 5/6mm??! This seems crazy to me as last vehicle I changed pads at 110,000km and again at 190,000. I’ll take it to the dealer soon and see what they say, but there’s no way in the world burning through 50% of the pad in 10,000 is reasonable. The fronts look as new, as do the rotors. Feels like really shit pad material, or something is stuck ( though no other symptoms to suggest the latter…)

 

[mwelby]

Ok I understand now but with all these different “holds” I guess I’m just wondering which brakes are the ones being held, front or back? Not trying to start any flame wars here, I just am unsure, and since I’ve been here, 5 months, Ozarkbeard has, in my opinion, been a great wealth of useable advice!

Good question. I thought that the auto hold affected all four brakes. Hmmm…

 

[HeyBales]

Good question. I thought that the auto hold affected all four brakes. Hmmm…

It does - pretty much equal pressure to all 4.

 

[HeyBales]

I’m joining this club…
Just rotated tires at 10,000km / 7000miles and the rear pads are down to 5/6mm??! This seems crazy to me as last vehicle I changed pads at 110,000km and again at 190,000. I’ll take it to the dealer soon and see what they say, but there’s no way in the world burning through 50% of the pad in 10,000 is reasonable. The fronts look as new, as do the rotors. Feels like really shit pad material, or something is stuck ( though no other symptoms to suggest the latter…)

For your slowdowns to finally stopping, the transition from regen to real pads - engages the back sooner ever so slightly, and with more pressure ever so slightly.

Actually, if you read up on gentle driving - for decades there have been complaints of rear pads going first or same time as front.

Doesn't help the rear are usually thinner pad material, as in our case I thought.
So even if engaged at the same time (likely for past decades), they'll wear sooner.

 

[Mavster Mechanic]

I’m joining this club…
Just rotated tires at 10,000km / 7000miles and the rear pads are down to 5/6mm??! This seems crazy to me as last vehicle I changed pads at 110,000km and again at 190,000. I’ll take it to the dealer soon and see what they say, but there’s no way in the world burning through 50% of the pad in 10,000 is reasonable. The fronts look as new, as do the rotors. Feels like really shit pad material, or something is stuck ( though no other symptoms to suggest the latter…)

Perhaps you did not know.

The fronts and rears take different pads and come from the factory in different thicknesses. Yours are probably normal. The rears are supposed to be thinner.

 

[Mavster Mechanic]

P.S.

Ford says to replace pads at 2mm thickness.

 

[Waterick]

Have to wonder if Ford is using thinner OEM pads to start with?

 

[Mavster Mechanic]

Have to wonder if Ford is using thinner OEM pads to start with?

Getting OEM thickness is difficult to find. It's not listed in Ford's Parts Online.

However;

4 pcs Front Brake Pads weigh 3.76 lbs.
4 pcs Rear Brake Pads weigh 2.00 lbs.

Fronts are almost double.
(or rears are about half)

 

[Maverick2022XL]

My personal experience, at 65k the rotors were toast on my truck, the cast was cracking and flaking on the surface and around the edges. They were not salvageable at all. To be fair I do tow a bit with the truck and that is well above the 2k limit since I have a 4k tow package. How much that can be attributed to the towing or cheap low quality rotors is hard to say but they were some of the worst worn rotors I've ever seen. Brake pads on the other hand were evenly worn when I changed everything.

 

[Maverick2022XL]

As far as what Ford considers good / medium / poor for brake pad thickness for disc brakes is the following according to the multipoint inspection summary sheet they give you at service.

Good
5mm / 7/32" or better

Medium
3.01mm to 4.99mm / 4/32" to 7/32"

Poor
3mm / 4/32" or less

 

[Mavster Mechanic]

Anecdotal evidence:

Rears cost 30% less than fronts.
No one lists thickness for OEM replacements. It's as if they don't want you to know. So we can't monitor.
But rears came from the factory thinner. I'm sure of that.

Just "must be changed" at 2mm.

My Fronts are 9mm at 65,000 miles.
My Rears are 7mm.

Seems like they will last quite a while longer.

 

[Maverick2022XL]

Getting OEM thickness is difficult to find. It's not listed in Ford's Parts Online.

However;

4 pcs Front Brake Pads weigh 3.76 lbs.
4 pcs Rear Brake Pads weigh 2.00 lbs.

Fronts are almost double.
(or rears are about half)

The front and rear rotors are also different sizes. Fronts are 325mm / 12.80" and rears are 302mm / 11.89"

 

[Mavster Mechanic]

The front and rear rotors are also different sizes. Fronts are 325mm / 12.80" and rears are 302mm / 11.89"

And the thicknesses are way different.
Fronts are vented.
Rears are not.

Front disc = 1 inch thick
Rear disc = 0.35" thick

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