Disc Brake question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68haywagon · 12-12-2005, 10:13 PM

I was tearing apart the 71 front crossmember I bought and both rotors have the same groove on both sides. I thought maybe a po sucked with brakes, but when I was cruising ebay I saw the same thing on other discs. Why is that groove there

Mike

srv8800 · 12-12-2005, 10:41 PM

mine had it too. same groove on both sides of both rotors. there must be something on the brake pads that grind before anything else. the new rotors i got were smoothe.

krue · 12-12-2005, 10:49 PM

Quote:

Originally Posted by srv8800

mine had it too. same groove on both sides of both rotors. there must be something on the brake pads that grind before anything else. the new rotors i got were smoothe.

If you wear the pads down far enough the rivets that hold them to the backing plate with start to grind down on the rotor.

Tx Firefighter · 12-14-2005, 08:13 AM

Original 71-72 rotors had a factory groove in them according to my GM parts guy. He told me that the first time he saw my truck, "Your truck still has OEM original front rotors, you can tell by the groove"

Starting in 73, no groove, and all aftermarket replacements are without groove too.

68haywagon · 12-14-2005, 11:24 AM

Thanks....now I wonder why they put it there? Also with this groove, can they be cut? They don't look too bad, and with replacements at about $70 a piece I might try to reuse mine.

Mike

67ChevyRedneck · 12-14-2005, 11:30 AM

Quote:

Originally Posted by 68haywagon

Thanks....now I wonder why they put it there? Also with this groove, can they be cut? They don't look too bad, and with replacements at about $70 a piece I might try to reuse mine.

Mike

I got mine from Autozone about 2 years ago. Paid 32 bucks each for them. The current price is about 35 bucks each. Not sure how "good" they are, but They've been on the truck for 2 years and 6,000 miles, no vibrations or wear problems with them. Might be a cheaper alternative if your's cant be "turned."

boundstaffpress · 12-14-2005, 11:31 AM

My 71 malibu has a groove on the factory rotors. A futile attempt at adding surface area in my estimation.

**truckdude239** · 12-14-2005, 11:54 AM

if you got an advance auto around you http://www.partsamerica.com/ProductD...pe=221&ptset=A

they 29 buxs of you got the 5 lug

68haywagon · 12-14-2005, 11:57 AM

I guess I have to go back to Advance and flip a little. They told me the only ones they had were $70.....I didn't check online because I don't need them quite yet. I stay away from AZ as much as possible....the manager lady smells REAL bad

Mike

12-12-2005, 10:13 PM	#1
68haywagon I'm watching you! Join Date: Feb 2005 Location: Levittown, PA Posts: 1,822	Disc Brake question I was tearing apart the 71 front crossmember I bought and both rotors have the same groove on both sides. I thought maybe a po sucked with brakes, but when I was cruising ebay I saw the same thing on other discs. Why is that groove there Mike __________________ 2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold Last edited by 68haywagon; 12-12-2005 at 10:15 PM.

12-12-2005, 10:41 PM	#2
srv8800 Registered User Join Date: Oct 2005 Location: Texas Posts: 22	Re: Disc Brake question mine had it too. same groove on both sides of both rotors. there must be something on the brake pads that grind before anything else. the new rotors i got were smoothe. __________________ '72 lwb pickup daily driver

12-14-2005, 08:13 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Disc Brake question Original 71-72 rotors had a factory groove in them according to my GM parts guy. He told me that the first time he saw my truck, "Your truck still has OEM original front rotors, you can tell by the groove" Starting in 73, no groove, and all aftermarket replacements are without groove too. __________________ I'm on the Instagram- @Gearhead_Kevin

12-14-2005, 11:24 AM	#5
68haywagon I'm watching you! Join Date: Feb 2005 Location: Levittown, PA Posts: 1,822	Re: Disc Brake question Thanks....now I wonder why they put it there? Also with this groove, can they be cut? They don't look too bad, and with replacements at about $70 a piece I might try to reuse mine. Mike __________________ 2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold

12-14-2005, 11:31 AM	#7
boundstaffpress Jamie Hyneman is my twin Join Date: Nov 2005 Location: La Junta, Colorado Posts: 705	Re: Disc Brake question My 71 malibu has a groove on the factory rotors. A futile attempt at adding surface area in my estimation. __________________ Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis

12-14-2005, 11:54 AM	#8
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Disc Brake question if you got an advance auto around you http://www.partsamerica.com/ProductD...pe=221&ptset=A they 29 buxs of you got the 5 lug __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-14-2005, 11:57 AM	#9
68haywagon I'm watching you! Join Date: Feb 2005 Location: Levittown, PA Posts: 1,822	Re: Disc Brake question I guess I have to go back to Advance and flip a little. They told me the only ones they had were $70.....I didn't check online because I don't need them quite yet. I stay away from AZ as much as possible....the manager lady smells REAL bad Mike __________________ 2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold

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