[framedraggin94]

Dealer is telling me it's normal. Doesn't sound normal to me. Anyone else have this issue?

 

[08RCSB]

Mine do.

 

[framedraggin94]

It's only on the outside surface. It's bad too.

 

[Kindredmsg]

I'm not sure about NNBS specifically, as I have swapped rotors to aftermarket,
but my 05 had some grooves in it after a while, didn't effect stopping or anything. I'm sure it's just dust and shit causing uneven mating surface.

 

[mud]

mine do 07 nnbs

 

[FarmTruk]

IMO, it's normal. Every car/truck I've had eventually develops them if they are not turned at pad replacement time.

Disc rotors are considered a "wear item" for reasons such as this.

 

[framedraggin94]

Mine were grooved within 2 or 3 months off the dealer lot.

 

[Mihela816]

The factory rotors seem to be pretty soft stuff. They all get grooves in them in short order.

 

[Ginger]

its the way they are, if you use the brakes, they wil get grooves, its normal.

 

[redrocker]

mine have the same problem..... dealer would not fix said they were within spec....bs..

 

[DV2000NJ]

its the way they are, if you use the brakes, they wil get grooves, its normal.

:word:

 

[nytahoeon23's]

i was looking at this the other day.

 

[lowoh8]

mine are the same way, its normal

 

[black06]

took my truck to the dealer for the same problem but my brakes were squealing. Dealer told me that the scoring was normal. Shitty rotors and cheap pads are the problem

 

[949sancwich]

mine have it too... normal

 

[Jameson]

NNBS brakes suck for some reason. Mine squeal like Burt Reynolds in Deliverance

 

[96z-71]

#PIT4049C: Scored Appearance On Front Brake Rotors - keywords disc groove pad - (Mar 11, 2009)


Subject: Scored Appearance On Front Brake Rotors


Models: 2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT

2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2005-2007 Chevrolet Silverado Classic with RPO JF3 or JF7

2005-2007 GMC Sierra Classic with RPO JF3 or JF7

2007-2009 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

1500 Models




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This PI was superseded to update model years. Please discard PIT4049B.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some owners may comment on a scored appearance of the front brake rotors. This scoring could be caused by the make up of the front brake lining. The brake lining formula has ingredients to clean rust off the rotor braking surface. This cleaning feature of the rotor braking surface may have a side effect of scoring.

Recommendation/Instructions:
This scored appearance is normal as long as no other symptoms are experienced such as pulsation, roughness, noise, and the scoring does not exceed the specification in SI.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

 

[Chris.]

NNBS brakes suck for some reason. Mine squeal like Burt Reynolds in Deliverance

Quote of the day

 

[J-ROD]

The rotors on my nnbs are fucked! Junk :imo

 

[08RCSB]

Lolz mine are great, never noisy or anything. :shrug: seriously.