Grove in center of both front brake rotors ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

full foot notch · 09-17-2014, 12:43 AM

Was working on the truck and was trying to see if the spindles on my truck were CPP or not since there's a CPP spring kit all around. I noticed this grove on the rotor and first thought was aww F I've gotta take apart this truck to replace the pads and rotor, so I looked and saw that the pad has plenty of meat on it. I ran my finger nail over it and it seems to be a machined groove and not something akin to a bad pad. I checked the passenger side and it too had an identical groove in the rotor, I tried getting digital calipers between the wheel and rotor and seems about 1 inch down from the outside edge. I've heard of slotted rotors but not with a single groove. And since it's identical locations on both front rotors my mind tends to eliminate that it's bad pads , the second appearing line nearest the hub is just where the cast part of the rotor meets the machined surface , it's not a line at all

Here's a pic of the rotors

Mikeeal33 · 09-17-2014, 01:04 AM

Yes it is supposed to be there. No worries run it!

full foot notch · 09-17-2014, 01:24 AM

Any idea who makes the rotor ?

**PGSigns** · 09-17-2014, 06:57 AM

Looks like a 5 lug wheel so it is a stock 73 to 87 rotor. Could be from any auto parts store.
Jimmy

Mikeeal33 · 09-17-2014, 12:35 PM

Quote:

Originally Posted by full foot notch

Any idea who makes the rotor ?

What year is your truck? Mine is a 72 with front discs, and that groove is there so I don't agree with it being a 73-87 rotor. When I was looking at stock replacements they all had the groove in em.

I don't know any particular manufacturer, but I do agree that they can be had at any of the parts stores.

NovaBrad · 09-26-2014, 07:52 PM

My 72 C10 has the same groove\rotors and I believe my 72 Nova also has the same groove as well.

full foot notch · 09-26-2014, 08:40 PM

Mines a 72 also. And glad to know I'm not going insane over this

**66 C10 383** · 09-27-2014, 11:21 AM

Most stock style rotors have that groove. I've been told it's to show the rotors thickness, as in, if the rotors are turned past the point the groove is gone, the rotors need to be replaced. So you basically can visually check the thickness rather that checking with micrometers.

full foot notch · 09-27-2014, 01:17 PM

See my thought would of been maybe the groove was there for assisting brake pad gasses so that the pad doesn't float

ERASER5 · 10-01-2014, 10:05 AM

Quote:

Originally Posted by full foot notch

See my thought would of been maybe the groove was there for assisting brake pad gasses so that the pad doesn't float

That too, but in the days of turning rotors, that groove was a simple visual cue. Groove gone and the rotor not smooth yet? Replace. No question about it.

Rich72C10 · 01-14-2021, 03:07 PM

ah, so glad about this posting. I was checking my rotors and thought darn that can't be good, then noticed the same grove on the other side! Guess if the grove is nice and deep - rotor are in good shape!

**kwmech** · 01-14-2021, 09:13 PM

I don't think they about the gasses back then

SCOTI · 01-15-2021, 01:40 PM

I remember just the early 71-72 rotors having that groove.

09-17-2014, 12:43 AM	#1
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	Grove in center of both front brake rotors ? Was working on the truck and was trying to see if the spindles on my truck were CPP or not since there's a CPP spring kit all around. I noticed this grove on the rotor and first thought was aww F I've gotta take apart this truck to replace the pads and rotor, so I looked and saw that the pad has plenty of meat on it. I ran my finger nail over it and it seems to be a machined groove and not something akin to a bad pad. I checked the passenger side and it too had an identical groove in the rotor, I tried getting digital calipers between the wheel and rotor and seems about 1 inch down from the outside edge. I've heard of slotted rotors but not with a single groove. And since it's identical locations on both front rotors my mind tends to eliminate that it's bad pads , the second appearing line nearest the hub is just where the cast part of the rotor meets the machined surface , it's not a line at all Here's a pic of the rotors

09-17-2014, 01:04 AM	#2
Mikeeal33 Registered User Join Date: Feb 2014 Location: Northern Nevada Posts: 208	Re: Grove in center of both front brake rotors ? Yes it is supposed to be there. No worries run it! __________________ 1972 Driver SOLD

09-17-2014, 01:24 AM	#3
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	Re: Grove in center of both front brake rotors ? Any idea who makes the rotor ?

09-17-2014, 06:57 AM	#4
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Grove in center of both front brake rotors ? Looks like a 5 lug wheel so it is a stock 73 to 87 rotor. Could be from any auto parts store. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

09-26-2014, 07:52 PM	#6
NovaBrad Registered User Join Date: Aug 2014 Location: Huntley,Illinois Posts: 21	Re: Grove in center of both front brake rotors ? My 72 C10 has the same groove\rotors and I believe my 72 Nova also has the same groove as well.

09-26-2014, 08:40 PM	#7
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	Re: Grove in center of both front brake rotors ? Mines a 72 also. And glad to know I'm not going insane over this

09-27-2014, 11:21 AM	#8
66 C10 383 Senior Member Join Date: Aug 2012 Location: Somewhere In So. IL. Posts: 412	Re: Grove in center of both front brake rotors ? Most stock style rotors have that groove. I've been told it's to show the rotors thickness, as in, if the rotors are turned past the point the groove is gone, the rotors need to be replaced. So you basically can visually check the thickness rather that checking with micrometers. __________________ Doug Old Build Thread - 383/T56 http://www.67-72chevytrucks.com/vboa...d.php?t=540838 Updated Build Thread - Modern Relic - 66 C10 536 Dark Aqua 5.3/4L60E - BTR Stage IV Truck Cam - Vintage Air - Dakota Digital http://67-72chevytrucks.com/vboard/s...d.php?t=778784

09-27-2014, 01:17 PM	#9
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	Re: Grove in center of both front brake rotors ? See my thought would of been maybe the groove was there for assisting brake pad gasses so that the pad doesn't float

01-14-2021, 03:07 PM	#11
Rich72C10 Mr. Cheyenne Join Date: Jun 2020 Location: Kyle, Texas Posts: 1,687	Re: Grove in center of both front brake rotors ? ah, so glad about this posting. I was checking my rotors and thought darn that can't be good, then noticed the same grove on the other side! Guess if the grove is nice and deep - rotor are in good shape! __________________ Richard *'72 Chevy C10 Cheyenne Super WHT/MED BRONZE/WHT SBC 350 \| TH350 \| LWB \| AC \| Buddy Seats Upgrades:** Tilt \| Front Sway Bar \| Radio \| Sliding Window \| Bed Spare w/Lock Bed Rails \| Full LEDs \| Courtesy Lights \| Tachometer \| Glovebox Lock & Light \| Head Light Relays \| *Upgraded Fully Super Trim

01-14-2021, 09:13 PM	#12
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,631	Re: Grove in center of both front brake rotors ? I don't think they about the gasses back then

01-15-2021, 01:40 PM	#13
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: Grove in center of both front brake rotors ? I remember just the early 71-72 rotors having that groove. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*



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