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Re: 11.75" rotors which cars ? [Re: cudazappa] #560527 12/25/09 03:13 PM 12/25/09 03:13 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Quote: I used to find R body cars in the wrecking yard on a fairly regular basis but not anymore. At one point I had a very large box full of those 11.75 adapters but now they are all gone. I wish someone would reproduce them. Seems like a sure money maker. For some reason the aftermarket only reproduces the weeny adapter and not the big one. would people want the sliders or the pin type? I've got a set of sliders currently holding a box down from floating, I can do some measurements and some CAD work. I'd have to find a set of pin type... I personally like the sliders. easier to find calipers, and I think they're a little more rigid.... 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: 11.75" rotors which cars ? [Re: patrick] #560528 12/25/09 03:49 PM 12/25/09 03:49 PM
Joined: Mar 2007 Posts: 550 ne B broncobra mopar
broncobra mopar B Joined: Mar 2007 Posts: 550 ne	Wow, I posted a big answer and guess I didn't hit the right button. Anyway, If you buy replacement rotors from NAPA for the 1981 Cordoba, be aware that they sell a Blue and a Gold standard. One's cheap, the other higher. It doesn't matter on the rotors, you can still get either Chinese junk or Canadian goodness. It all boils down to what the warehouse has on hand for your area. My NAPA dealer (that I've known for years) told me he can't special order one or the other and kinda got in a huff when I kept ordering and sending back the China junk. They are that bad. Set them side by side and you can see and feel the difference. Specify the Gold and don't take the China crap for anything.I sent many back until I had a usable set for immediate bolt on, and an extra set for future brake replacement repair.

Re: 11.75" rotors which cars ? [Re: broncobra] #560529 12/25/09 04:07 PM 12/25/09 04:07 PM
Joined: Jan 2009 Posts: 89 North Carolina, USA H Husker1 member
Husker1 member H Joined: Jan 2009 Posts: 89 North Carolina, USA	i am getting ready to do this swap and was wondering if all of the 11.75 rotors are the same? I know if you read the "disc-0-tech" article it says to get the HD police rotors. As far as i can tell there is only one style of 11.75 rotor. i was going to purchase the (NB 4885579) premium part from NAPA, the picture shows the extra ribbing on the inner bearing race like the article states for the police rotor. Is this the right rotor? i looked it up under '76 cordoba, which is what i got my caliper adapters off of. if this is the right one i guess keep ordering them until i get two made in usa.

Re: 11.75" rotors which cars ? [Re: Husker1] #560530 12/25/09 05:39 PM 12/25/09 05:39 PM
Joined: Mar 2007 Posts: 550 ne B broncobra mopar
broncobra mopar B Joined: Mar 2007 Posts: 550 ne	I'm sorry, it's to cold to go out in the garage and check right now what the NAPA # are, but my records show for a 1979 Cordoba HD 11.75" unicast 1" thick rotor, Mopar PN 4126545, Bendix PN 141145 and CarQuest PN PN 5311 - are the good ones ONLY if you get the Canada ones. The box will be marked Made In Canada. 1979 up R body Police or 1976 to 1978 B-Body Police is what I have written in my logs from studying it all awhile ago. The parts dude should be able to cross reference those numbers and affirm if they are cop rotors for sure. I don't know what the Royal Canadian Mounties used for sure! lol.

Re: 11.75" rotors which cars ? [Re: MadMatt] #560531 12/26/09 08:18 AM 12/26/09 08:18 AM
Joined: Nov 2004 Posts: 340 Vitoria, Spain C Coke enthusiast
Coke enthusiast C Joined: Nov 2004 Posts: 340 Vitoria, Spain	Are you happy with that setup? I'm gathering parts for the swap. I have the spindles and finally tracked down a good set of Viper calipers today at a reasonable price. What size wheels are you running? I'm hoping and praying it will fit inside my 15" Halibrand 5-spokes. Well, i have not driven the car very much ,it passed the Brake test in the technical inspection,but i belive that they should to brake more. I have manual brakes now but they definetively need power boost,so i will mount a Hidro Boost system when i finish the engine. The company that builds the adapters for the Viper Calipers suggests manual brakes but i desagree . I do not recall how much fluid pressure arrives to the caliper,but i,m pretty sure that they need more. About the wheels they are 15" Weld Pro Star. The caliper rubbed a little on the spokes so i put a couple of washers between the calipers and the bolts just for keeping the caliper a bit further from the wheel .Thats how i solved the trouble. I have a list with all the parts required in some place(That i should to looking for). If you need help, send to me a PM. Regards Last edited by Coke; 12/26/09 08:26 AM.

Re: 11.75" rotors which cars ? [Re: Coke] #560532 12/26/09 09:11 AM 12/26/09 09:11 AM
Joined: May 2006 Posts: 62 New Brunswick U Unfair Advantage member
Unfair Advantage member U Joined: May 2006 Posts: 62 New Brunswick	Even though the rotors are thicker on the C bodies and trucks are the caliper adapters the same as the b bodies ?? Last edited by Unfair Advantage; 12/26/09 09:13 AM.

Re: 11.75" rotors which cars ? [Re: Unfair Advantage] #560533 12/26/09 10:59 AM 12/26/09 10:59 AM
Joined: Jan 2003 Posts: 27,483 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,483 So Cal	Quote: Even though the rotors are thicker on the C bodies and trucks are the caliper adapters the same as the b bodies ?? No, the C-body adapters are different. They will not meet the dimensional specs outlined in the www.moparaction.com article.

Re: 11.75" rotors which cars ? [Re: Coke] #560534 12/26/09 11:08 AM 12/26/09 11:08 AM
Joined: Jan 2003 Posts: 27,483 So Cal autoxcuda Too Many Posts
autoxcuda Too Many Posts Joined: Jan 2003 Posts: 27,483 So Cal	Quote: Well, i have not driven the car very much ,it passed the Brake test in the technical inspection,but i belive that they should to brake more. I have manual brakes now but they definetively need power boost,so i will mount a Hidro Boost system when i finish the engine. The company that builds the adapters for the Viper Calipers suggests manual brakes but i desagree . I do not recall how much fluid pressure arrives to the caliper,but i,m pretty sure that they need more. A power booster just assists with pedal pressure. It does not increase line pressure to the caliper. MadMatt ran into a similar situation and he changed the master cylinder diameter.

Re: 11.75" rotors which cars ? [Re: autoxcuda] #560535 12/26/09 11:26 AM 12/26/09 11:26 AM
Joined: Oct 2005 Posts: 8,914 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,914 Ontario, Canada	Like any other post on here there is a lot of negativity around "China" product. I was lucky enough to get a set of north american made units when I bought mine. HOWEVER, for the past 6 years I've been putting China rotors on my daily drivers - 4 different vehicles - and have had ZERO problems with any of them. Generally they are about half the price of non-China rotors. Personally I would not have an issue with using China rotors in this application either except that I got these on sale so they were the same price as China rotors. FWIW, I met with an importer a few years back who was bringing rotors in by the container load. He said all his rotors were manufactured to the same metalurgic and finish standards as the originals. During a three week period we had numerous discussions about China manufacturing processes and capabilities. It all boils down to what the buyer specifies. They can make just as good a product as anyone else in the world, it all depends on whether someone wants to bring in good quality for less money or just maximize their profits with junk.

Re: 11.75" rotors which cars ? [Re: Coke] #560536 12/26/09 01:36 PM 12/26/09 01:36 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Your master cylinder bore is too big. I recommend a 15/16" bore master cylinder for Viper calipers. This will give you adequate line pressure. You should also change to 7/8" wheel cylinders if you are running rear drum brakes. Contact info

Re: 11.75" rotors which cars ? [Re: RTshaker] #560537 12/26/09 02:15 PM 12/26/09 02:15 PM
Joined: Dec 2005 Posts: 308 Turneffe B BJohnson enthusiast
BJohnson enthusiast B Joined: Dec 2005 Posts: 308 Turneffe	Large slider adapters. 5690604-LargeRotorAdapters1.JPG (113 downloads)

Re: 11.75" rotors which cars ? [Re: Husker1] #560538 12/26/09 02:52 PM 12/26/09 02:52 PM
Joined: May 2005 Posts: 4,760 Florida BDW master
BDW master Joined: May 2005 Posts: 4,760 Florida	Quote: i am getting ready to do this swap and was wondering if all of the 11.75 rotors are the same? I know if you read the "disc-0-tech" article it says to get the HD police rotors. As far as i can tell there is only one style of 11.75 rotor. i was going to purchase the (NB 4885579) premium part from NAPA, the picture shows the extra ribbing on the inner bearing race like the article states for the police rotor. Is this the right rotor? i looked it up under '76 cordoba, which is what i got my caliper adapters off of. if this is the right one i guess keep ordering them until i get two made in usa. Pretty sure the article referes to the adapter, not the rotor, as being HD police versions. The HD adapter has more ribbing.

Re: 11.75" rotors which cars ? [Re: BJohnson] #560539 12/26/09 03:00 PM 12/26/09 03:00 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Quote: Large slider adapters. Those are the ones I have.

Re: 11.75" rotors which cars ? [Re: BDW] #560540 12/26/09 03:34 PM 12/26/09 03:34 PM
Joined: Oct 2005 Posts: 8,914 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,914 Ontario, Canada	Quote: Pretty sure the article referes to the adapter, not the rotor, as being HD police versions. The HD adapter has more ribbing. No, it specifically refers to the rotors. It also makes mention of a heavy duty adapter.

Re: 11.75" rotors which cars ? [Re: Stanton] #560541 12/26/09 03:45 PM 12/26/09 03:45 PM
Joined: Jul 2003 Posts: 2,126 Hunt Valley, Maryland 1fastrunner top fuel
1fastrunner top fuel Joined: Jul 2003 Posts: 2,126 Hunt Valley, Maryland	It does make mention of heavier duty brackets, but be sure you get the right ones. The 1st set I had must have been from a c body(won't work). I thought they were the heavier version ones, but they weren't. Jim

Re: 11.75" rotors which cars ? [Re: broncobra] #560542 12/26/09 04:34 PM 12/26/09 04:34 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	Quote: Wow, I posted a big answer and guess I didn't hit the right button. Anyway, If you buy replacement rotors from NAPA for the 1981 Cordoba, be aware that they sell a Blue and a Gold standard. One's cheap, the other higher. It doesn't matter on the rotors, you can still get either Chinese junk or Canadian goodness. It all boils down to what the warehouse has on hand for your area. My NAPA dealer (that I've known for years) told me he can't special order one or the other and kinda got in a huff when I kept ordering and sending back the China junk. They are that bad. Set them side by side and you can see and feel the difference. Specify the Gold and don't take the China crap for anything.I sent many back until I had a usable set for immediate bolt on, and an extra set for future brake replacement repair. FWIW, an '81 cordoba is a J body, and only came with the smaller 10.875" rotor from the factory. 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: 11.75" rotors which cars ? [Re: DoctorDiff] #560543 12/26/09 04:54 PM 12/26/09 04:54 PM
Joined: Nov 2004 Posts: 340 Vitoria, Spain C Coke enthusiast
Coke enthusiast C Joined: Nov 2004 Posts: 340 Vitoria, Spain	Quote: Your master cylinder bore is too big. I recommend a 15/16" bore master cylinder for Viper calipers. This will give you adequate line pressure. You should also change to 7/8" wheel cylinders if you are running rear drum brakes. I think mine is 1" if i recall correctly Not idea about the rear wheel cyls. but i put a Wilwood valve in line. The car came with the Bendix four pistons setup from the factory so it also has the reducer valve for the rear circuit. Last edited by Coke; 12/26/09 04:57 PM.

Re: 11.75" rotors which cars ? [Re: patrick] #560544 12/26/09 08:48 PM 12/26/09 08:48 PM
Joined: Mar 2007 Posts: 550 ne B broncobra mopar
broncobra mopar B Joined: Mar 2007 Posts: 550 ne	Sorry if I gave the wrong year. could anyone please verify then that the above numbers are right for a 79 Cordoba and the manufactures # above?

Re: 11.75" rotors which cars ? [Re: @#$%&*!] #560545 12/26/09 11:46 PM 12/26/09 11:46 PM
Joined: Apr 2008 Posts: 1,285 Pacific NW USA CompSyn pro stock
CompSyn pro stock Joined: Apr 2008 Posts: 1,285 Pacific NW USA	Quote: Quote: I found the pin type adapters on a 77 Grand Fury. Big 11.75 cop car discs on a 318 car... Isn't the 77 Gran Fury a C-body? My mistake, it was a 77 B-Body Fury like this one: The Fury name has been tossed around so much that I loose track sometimes.

Re: 11.75" rotors which cars ? [Re: autoxcuda] #560546 12/27/09 12:15 AM 12/27/09 12:15 AM
Joined: Nov 2006 Posts: 733 Nampa, ID MadMatt super stock
MadMatt super stock Joined: Nov 2006 Posts: 733 Nampa, ID	Quote: A power booster just assists with pedal pressure. It does not increase line pressure to the caliper. MadMatt ran into a similar situation and he changed the master cylinder diameter. I had a 1 1/8" MC with manual brakes and 73 up A-Body discs up front, drums out back, and it was a nightmare. I went to the 15/16" bore base on Dr. Diff's recommendation and it was a night and day difference. Part of that recommendation was based on me telling the good Doctor that I would be swapping to the Viper brakes (and hopefully his rear disk kit) down the road. I now have the spindles and calipers. Next week I will order the ARE adapters and the rotors. Can't wait to see how the car stops when I'm all done. Some see the glass as half empty, some see the glass as half full. I just drink straight out of the bottle.

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