Rotors weird

[Nurchburgler]

I have never seen wear like this.

The guy I bought the truck from said the rotors were metal on metal.

The pads are new....but both rotors have this huge groove?

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I already bought new rotors and loaded calipers..but just curious what would cause this?

Thanks fellas

 

[bucket]

Those are probably the original rotors, GM used to do that for one reason or another. The original rotors on my '70 Impala have the same groove in them.

 

[RetroC10Sport]

What Bucket said. It had something to do with being quieter and dissipating heat better.

 

[SlickGTP]

If I remember correctly... The grooves are to help vent any gas build up from the pads heating up under braking. Learned about that when I cooked one of my rotors when a line failed me and locked the caliper in the applied position causing me to replace it.

 

[Nurchburgler]

Thanks for the info.

Interesting

 

[Boone83K10]

I have a reciprocating noise coming from my front end, when I took the wheels off I noticed my rotors look like this too. Pad are new but rotor is grooved. Still didn't find out what is making the noise.

 

[skysurfer]

I know what reciprocating means but can't figure out how the word applies to your braking issue.

 

[Boone83K10]

meaning a noise every time the wheel makes a revolution (above about 7 mph) and gets faster as I go until the exhaust drowns it out.

 

[skysurfer]

Assuming you've confirmed the noise is brake related by lightly applying the brakes to see if the noise stops or changes pitch:

The first and easiest thing to do is check the pads to see if the metal wear tab is starting to make contact with the rotors. In your case however the pads are new so we know that's not the issue.

Did the pads get installed with some Disc Quiet compound on the back? If that wasn't done go ahead and do it. I prefer the CRC brand. While you're waiting for it to cure spray the calipers and rotors with some brake cleaner, making sure every bit of dirt and grease are off the rotors. Reassemble and test.

If you still have the noise your rotors are too far out of true and will have to be turned by a shop.

 

[Boone83K10]

pads are new, disc brake quiet is all over it, bushings and slider bolts are lubed.. the rotors are the last thing to check. But I am beginning to think it's bearings or front axle. Although the sound isn't what bearing/axles sound like either.

 

[Boone83K10]

I won't thread jack this anymore...