help!!!! Front rotors from LMC dont fit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71Seth · 03-09-2003, 06:22 PM

I just put on new rotors, hoses, calipers, and pads on my 71. Problem...There is a 1/2" diffrance in the sholders where the wheels bolt to. The old on is 1 5/8" and the new from LMC is 1 1/8. Now my wheel rubs the caliper!!!! Has anyone had this problem? Also had to modify the hoses a bit to get them to fit in the mounting hole, anyone run in to that? Any help yall could give will be great. thanks in adv.

lpaine · 03-09-2003, 07:36 PM

Sounds like they sent you the wrong rotors; you might have 4-wd rotors, I beleive they are different from 2-wd. If in doubt, phone lmc.They will know.

71Seth · 03-09-2003, 09:35 PM

4wd rotors only slip over the studs........dont they??
Anyway i compaired them before i put them on but missed that. Guess i could just put on 20's LOL
anyone else?????????????????????????HELP

Demmit_Hemmit's 65 · 03-09-2003, 10:01 PM

it still sounds like they sent you the wrong rotors..................i think they gave you rotors for 73 or newer....not sure but you should call LMC............A friend of mine ordered an ignition switch for his 71 GMC..............they sent him one from an Import car........wow what a mistake................call 'em

Dreaminator · 03-09-2003, 10:39 PM

Call them because they have been very fair with me when I made a mistake and ordered the wrong part.

**Palf70Step** · 03-09-2003, 10:47 PM

You didn't mention what type of wheels you have, but I remember a statement on several of the vender sites about some rims may not clear the caliper with the disk brakes. I would imagine this probaly pertains to stock steel wheels, but it could apply to custom wheels too.

71Seth · 03-09-2003, 11:31 PM

What the &%$@!!!!!!!!!!!!!!!!!!!
I just went out to work somemore and now they measure the same.

I guess i should lay off the Jack while working.LOL KIdding. But the wheels still rub the caliper. They a 15x12 ultras, fixing to buy a set of 15x8.5 in a week or two though. Taxes
what could be the problem. the calipers are slid all the way up against the outter pad. I have new calipers on the way now to complete the brake build up, will be here tues. Maybe that will let me notice somthing simple?!?

Any new ideas????
thanks for all the input

Longhorn Man · 03-09-2003, 11:37 PM

Have you replaced your pads since the wheels went on originally?
The thickness of the new rotors combined with the fresh pads are probably kicking the caliper out just enough to cause contact.
I have seen ppl use washers (between the tim and rotor) to rectify this problem.

71Seth · 03-09-2003, 11:49 PM

i have thought of that myself but before i went to rigging on my new frontend i wanted to ck with yall. looks like it would probly only take one washer to fix this problem if thats the way to go

mrein3 · 03-10-2003, 09:00 AM

I'll bet your rims that don't fit on the front over the new rotors do fit over the drums in the back.

When I was in high school a friend had a 1974 Chevelle with front disc brakes. He had a flat on the front so I let him use the spare for my 72 drum brake Malibu. It didn't fit over the rotors. It wouldn't work.

When I converted my 72 Malibu from front drums to front discs I had to get a set of 4 rims that fit over the rotors so I'd have 4 matching rims.

My truck has 6 rims that fit the 6-lug bolt pattern. Only 4 of the rims fit over the rotors on the front.

To make a long story short, as Palf70Step points out, there is such a thing as a drum brake rim and a disk brake rim. Back when these trucks were made was when GM was first selling disc brakes. Just because a previous owner got a set of 67-72 rims at the bone yard doesn't mean they'll fit if you have front discs. After 30+ years who know what you got for your truck.

Look at the shoulder on the back of the rim that is hitting the rotor. Actually it hits the caliper. The "newer" disc brake rims don't have this shoulder. If it wasn't -11F I'd go next door with the digital camera and show you.

03-09-2003, 06:22 PM	#1
71Seth Registered User Join Date: Dec 2002 Location: calvert city, ky Posts: 282	help!!!! Front rotors from LMC dont fit I just put on new rotors, hoses, calipers, and pads on my 71. Problem...There is a 1/2" diffrance in the sholders where the wheels bolt to. The old on is 1 5/8" and the new from LMC is 1 1/8. Now my wheel rubs the caliper!!!! Has anyone had this problem? Also had to modify the hoses a bit to get them to fit in the mounting hole, anyone run in to that? Any help yall could give will be great. thanks in adv. __________________ 97 ext cab 4x4 04 pontiac grand am 05 honda rancher AT (yellow) 71' C-10 swb sb400 th350 .040, 292 Mag comp cam, high rise Edelbrock w/750 duel feed Holley, Accel super coil and wires, B&M ratchet shifter

03-09-2003, 07:36 PM	#2
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	Sounds like they sent you the wrong rotors; you might have 4-wd rotors, I beleive they are different from 2-wd. If in doubt, phone lmc.They will know. __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

03-09-2003, 09:35 PM	#3
71Seth Registered User Join Date: Dec 2002 Location: calvert city, ky Posts: 282	4wd rotors only slip over the studs........dont they?? Anyway i compaired them before i put them on but missed that. Guess i could just put on 20's LOL anyone else?????????????????????????HELP __________________ 97 ext cab 4x4 04 pontiac grand am 05 honda rancher AT (yellow) 71' C-10 swb sb400 th350 .040, 292 Mag comp cam, high rise Edelbrock w/750 duel feed Holley, Accel super coil and wires, B&M ratchet shifter

03-09-2003, 10:39 PM	#5
Dreaminator Dreaminator Join Date: Feb 2003 Location: Broken Arrow, Oklahoma Posts: 156	Call them because they have been very fair with me when I made a mistake and ordered the wrong part. __________________ The Dreaminator Daily Driver 1971 Cheyenne 10 Lwb Tilt/Tac 402 .030 TH400.

03-09-2003, 10:47 PM	#6
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,816	You didn't mention what type of wheels you have, but I remember a statement on several of the vender sites about some rims may not clear the caliper with the disk brakes. I would imagine this probaly pertains to stock steel wheels, but it could apply to custom wheels too. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-09-2003, 10:01 PM	#4
Demmit_Hemmit's 65 Senior Member Join Date: Mar 2002 Location: Peru, Indiana Posts: 741	it still sounds like they sent you the wrong rotors..................i think they gave you rotors for 73 or newer....not sure but you should call LMC............A friend of mine ordered an ignition switch for his 71 GMC..............they sent him one from an Import car........wow what a mistake................call 'em

03-09-2003, 11:31 PM	#7
71Seth Registered User Join Date: Dec 2002 Location: calvert city, ky Posts: 282	What the &%$@!!!!!!!!!!!!!!!!!!! I just went out to work somemore and now they measure the same. I guess i should lay off the Jack while working.LOL KIdding. But the wheels still rub the caliper. They a 15x12 ultras, fixing to buy a set of 15x8.5 in a week or two though. Taxes what could be the problem. the calipers are slid all the way up against the outter pad. I have new calipers on the way now to complete the brake build up, will be here tues. Maybe that will let me notice somthing simple?!? Any new ideas???? thanks for all the input __________________ 97 ext cab 4x4 04 pontiac grand am 05 honda rancher AT (yellow) 71' C-10 swb sb400 th350 .040, 292 Mag comp cam, high rise Edelbrock w/750 duel feed Holley, Accel super coil and wires, B&M ratchet shifter

03-09-2003, 11:37 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Have you replaced your pads since the wheels went on originally? The thickness of the new rotors combined with the fresh pads are probably kicking the caliper out just enough to cause contact. I have seen ppl use washers (between the tim and rotor) to rectify this problem.

03-09-2003, 11:49 PM	#9
71Seth Registered User Join Date: Dec 2002 Location: calvert city, ky Posts: 282	i have thought of that myself but before i went to rigging on my new frontend i wanted to ck with yall. looks like it would probly only take one washer to fix this problem if thats the way to go __________________ 97 ext cab 4x4 04 pontiac grand am 05 honda rancher AT (yellow) 71' C-10 swb sb400 th350 .040, 292 Mag comp cam, high rise Edelbrock w/750 duel feed Holley, Accel super coil and wires, B&M ratchet shifter

03-10-2003, 09:00 AM	#10
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,253	I'll bet your rims that don't fit on the front over the new rotors do fit over the drums in the back. When I was in high school a friend had a 1974 Chevelle with front disc brakes. He had a flat on the front so I let him use the spare for my 72 drum brake Malibu. It didn't fit over the rotors. It wouldn't work. When I converted my 72 Malibu from front drums to front discs I had to get a set of 4 rims that fit over the rotors so I'd have 4 matching rims. My truck has 6 rims that fit the 6-lug bolt pattern. Only 4 of the rims fit over the rotors on the front. To make a long story short, as Palf70Step points out, there is such a thing as a drum brake rim and a disk brake rim. Back when these trucks were made was when GM was first selling disc brakes. Just because a previous owner got a set of 67-72 rims at the bone yard doesn't mean they'll fit if you have front discs. After 30+ years who know what you got for your truck. Look at the shoulder on the back of the rim that is hitting the rotor. Actually it hits the caliper. The "newer" disc brake rims don't have this shoulder. If it wasn't -11F I'd go next door with the digital camera and show you. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN



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