Cracked rotor or heat checking?
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Joined: Oct 2005
Posts: 94
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From: Huntingtown MD
Cracked rotor or heat checking?
Babied 2005 with 30,000 miles.
Crack front rotor looks like a jagged pencil line across the disk face and shows on the rotor edge but is smooth everywhere. Dragging my finger nail across the surface reveals no irregularity.
Normal or not, replace or wait?
Anyone willing make a ballpark guess of the cost to have a Chevy dealer replace one rotor and install new front brake pads.
Crack front rotor looks like a jagged pencil line across the disk face and shows on the rotor edge but is smooth everywhere. Dragging my finger nail across the surface reveals no irregularity.
Normal or not, replace or wait?
Anyone willing make a ballpark guess of the cost to have a Chevy dealer replace one rotor and install new front brake pads.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
picture would help. a crack like that, while it "sounds" like surface crack wouldn't make me worry-free. it sounds like something I'd get replaced. guess on dealer cost: 125 rotor, 50 pads, 1.5 hr. labor. they might insist on both fronts being replaced at the same time, and possible drain and fill.
Le Mans Master
Joined: Jan 2005
Posts: 5,611
Likes: 5
From: Thousand Oaks California
Babied 2005 with 30,000 miles.
Crack front rotor looks like a jagged pencil line across the disk face and shows on the rotor edge but is smooth everywhere. Dragging my finger nail across the surface reveals no irregularity.
Normal or not, replace or wait?
Anyone willing make a ballpark guess of the cost to have a Chevy dealer replace one rotor and install new front brake pads.
Crack front rotor looks like a jagged pencil line across the disk face and shows on the rotor edge but is smooth everywhere. Dragging my finger nail across the surface reveals no irregularity.
Normal or not, replace or wait?
Anyone willing make a ballpark guess of the cost to have a Chevy dealer replace one rotor and install new front brake pads.
#05-05-23-007A: Information on Visual Brake Rotor Surface Cracking - (May 29, 2008)
The pass criteria for thermal fatigue testing specifies that the rotor is allowed to have small thermal cracking up to 2/3 of the brake plate surface. The brake plate surface for the front rotor is 50 mm (1.96 in) radially which means cracks are permitted up to 33 mm (1.29 in) radially across the rotor brake face in length. This would be the pass criteria for the end of severe testing. To have a large safety margin, a rule of thumb -- "small" thermal cracks are allowable and the rotor does not need to be replaced unless the cracks connect from hole to hole or the crack reaches the OD of the rotor.
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.
