6 lug disc conversion trouble HELP!!!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dave66! · 08-14-2007, 04:40 PM

Hello All
Im in the middle of a 6 lug drum to 6 lug disc conversion on a 70 pickup (my brothers)We used 73-87 upper and lower control arms with 1.25 caliper and spindles.to get 6 lug rotors we bought 9o 2wd rotors 6 lug(the 70 is 2wd)the rotors fit as well as everything else until time to install calipers.there is about 1/4 inch gap between the inboard pad and rotor.do i need the 1990 calipers as well?i was under the impression that 73-87 should work.Any help would be greatly appreciated its to hot to be fighting the job this close to the end.
Thanks Much Dave

glock35ipsc · 08-14-2007, 04:48 PM

The piston is probably still all the way in the caliper. Unless you can post a pic, I would guess that on the first couple of pumps the piston will be pushed out and the gap will be gone.

67ChevyRedneck · 08-14-2007, 05:19 PM

I remember that when I redid my brakes that with new shoes and the piston pushed all the way in, the caliper assembly barely fit over my rotors. I think it has more to do with mix/matched parts? There have been a couple threads on using newer rotors, but I can't remember if the parts mixes actually worked or not?

What year did you get the brake shoes for? Maybe some years are thicker than others?

Dave66! · 08-14-2007, 06:18 PM

i believe the piston is all the way in.ill double check.the brake pads came with the 73-87 front end.Im going over to a friends to get the 88 up front calipers to try.Thanks for the input Dave

**70C10Toejam** · 08-14-2007, 06:58 PM

are those the light-duty 3/4 ton rotors? thats what they sould like. the distance between the back of the rotor and the grease seal is different. I looked at that when I was doing my disk change, and didn't appear that they would work for just this reason. not sure if the caliper is different, or the spindle is different and moves the caliper location.

there may not be enough movement left in the caliper to wear the pads correctly.

good luck.

Dave66! · 08-14-2007, 07:34 PM

Well Thanks for all your input but i dont believe it will work with stock 88 up rotors the bearings are located 1/2 inch farther inboard compared to 73-87 rotor so im going to return the 1990 rotors and run five up front and six in the rear until i can afford a set of aftermarket six lug rotors.
Thanks again Dave

08-14-2007, 04:40 PM	#1
Dave66! Registered User Join Date: Jan 2002 Location: holiday,il,usa Posts: 52	6 lug disc conversion trouble HELP!!!!!! Hello All Im in the middle of a 6 lug drum to 6 lug disc conversion on a 70 pickup (my brothers)We used 73-87 upper and lower control arms with 1.25 caliper and spindles.to get 6 lug rotors we bought 9o 2wd rotors 6 lug(the 70 is 2wd)the rotors fit as well as everything else until time to install calipers.there is about 1/4 inch gap between the inboard pad and rotor.do i need the 1990 calipers as well?i was under the impression that 73-87 should work.Any help would be greatly appreciated its to hot to be fighting the job this close to the end. Thanks Much Dave __________________ 1972BLAZER,1966C10SWB,1963NOVASS HOLIDAY,IL

08-14-2007, 04:48 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: 6 lug disc conversion trouble HELP!!!!!! The piston is probably still all the way in the caliper. Unless you can post a pic, I would guess that on the first couple of pumps the piston will be pushed out and the gap will be gone. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

08-14-2007, 05:19 PM	#3
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: 6 lug disc conversion trouble HELP!!!!!! I remember that when I redid my brakes that with new shoes and the piston pushed all the way in, the caliper assembly barely fit over my rotors. I think it has more to do with mix/matched parts? There have been a couple threads on using newer rotors, but I can't remember if the parts mixes actually worked or not? What year did you get the brake shoes for? Maybe some years are thicker than others? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 08-14-2007 at 05:20 PM.

08-14-2007, 06:18 PM	#4
Dave66! Registered User Join Date: Jan 2002 Location: holiday,il,usa Posts: 52	Re: 6 lug disc conversion trouble HELP!!!!!! i believe the piston is all the way in.ill double check.the brake pads came with the 73-87 front end.Im going over to a friends to get the 88 up front calipers to try.Thanks for the input Dave __________________ 1972BLAZER,1966C10SWB,1963NOVASS HOLIDAY,IL

08-14-2007, 06:58 PM	#5
70C10Toejam Hellasick Join Date: Jul 2006 Location: Death Moans, IA Posts: 876	Re: 6 lug disc conversion trouble HELP!!!!!! are those the light-duty 3/4 ton rotors? thats what they sould like. the distance between the back of the rotor and the grease seal is different. I looked at that when I was doing my disk change, and didn't appear that they would work for just this reason. not sure if the caliper is different, or the spindle is different and moves the caliper location. there may not be enough movement left in the caliper to wear the pads correctly. good luck. __________________ I keep two MAGNUMS in my desk. One's a gun, and I keep it loaded. The other's a bottle and it keeps ME loaded. I'm Tracer Bullet. (Calvin and Hobbes) This life was a test. It was only a test. If this had been an actual life, you would have received instructions on where to go and what to do. RED meat is not bad for you...FUZZY BLUE/GREEN MEAT is bad for you!!!!!!!!!!!!! BUILT FORD TOUGH WITH CHEVY STUFF--sticker at Goodguys

08-14-2007, 07:34 PM	#6
Dave66! Registered User Join Date: Jan 2002 Location: holiday,il,usa Posts: 52	Re: 6 lug disc conversion trouble HELP!!!!!! Well Thanks for all your input but i dont believe it will work with stock 88 up rotors the bearings are located 1/2 inch farther inboard compared to 73-87 rotor so im going to return the 1990 rotors and run five up front and six in the rear until i can afford a set of aftermarket six lug rotors. Thanks again Dave __________________ 1972BLAZER,1966C10SWB,1963NOVASS HOLIDAY,IL

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