disc brake swap

[Heslekrants]

Originally Posted by BRAPP

thanks. and the backing plate from the 10 bolt will be a direct bolt onto the 14 bolt i have?

It bolts up but you need a 60mm spacer(s) between the 14 bolt axle flange & the 10 bolt backing plate to get the caliper & rotor to align properly.


Here's a conversion kit that uses rotors, calipers, pads, front brake lines (optional) and banjo bolts for an 85 Chevy 1/2 ton pickup 6 lug FRONT axle. If you want to keep your e-brake simply use '78 El Dorado rear calipers instead of the Chevy front calipers.

This is the same place that made my 60mm alum spacers.

http://cgi.ebay.com/ebaymotors/14-Bo...A1%7C72%3A1171

[Boost Infection]

Originally Posted by KEhrhardt

Well I emailed Kore about the 6 lug rotor, got their reply so I figured I would post for the benefit of others. I had asked about the part numbers for the 6 lug rotor for rear disc brakes on my 99 Silverado 4x4. This is what they use for their 88-00 kit:

We use the 88-91 front K1500 rotor (standard-duty) for this application. The OE rotor is a composite rotor design where the hat portion is stamped steel and the friction surface is cast onto the hat however some of the OE replacement/aftermarket rotors for the application are unicast designs. I have a pair of slotted AC Delco Durastop Performance rotors in stock if you're interested. They are $150 for the pair if you order with brackets and hoses.

(1) GM #18038526 (ACDELCO #18A1013) ROTOR, 11.625 X 1, 6 X 5.5, RH, DURASTOP PERFORMANCE
(1) GM #18038525 (AC DELCO #18A1012) ROTOR, 11.625 X 1, 6 X 5.5, LH, DURASTOP PERFORMANCE

You can use any GM metric small caliper with our brackets, including front or rear calipers, depending on whether you want to maintain rear parking brakes at the wheels or not.

(1) GM #18035814 Front Caliper w/o parking brake, RH (i.e. 1982-1987 Chevy Camaro front caliper)
(1) GM #18035815 Front Caliper w/o parking brake, LH
(1) GM #18035980 Rear Caliper w/ parking brake, RH (i.e. 1980-85 Cadillac Eldorado rear caliper)
(1) GM #18035981 Rear Caliper w/ parking brake, LH

Aside from that, you'll just need flexible brake hoses to go from the calipers to the rear axle hardlines which will require some minor modifications. We sell a braided stainless kit with (2) 12" FlexKORE hoses, (2) M10x1.5 banjo bolts, (4) 10mm crush washers, (2) clips, and (2) universal hose anchor brackets for $57.50. You may want to run an adjustable proportioning valve as well, which we have in stock for $50.

Please let me know if you have any further questions.

Regards,
Tobin Knighton
KORE3 Industries
800.357.5467

I meant to ask him about ABS. I am familiar with 4 wheel ABS using disc brakes, but I currently have drums on the back of the truck. I have ABS on the truck, I'm not sure if it is 4 wheel ABS or not? Some cars/trucks with rear drums sense the rotation of the cooling fins on the rear brake drum for the ABS. I'll have to poke around and find out how the system currently works and if they have a solution using their rear disc kit. HTH

Anyone have pics on the rear dics setup for a 6 lug 4x4 model?
Thanks

[haulass350]

still rocking this setup, i had to finally replace the rear pads last week other then that everything is working great, although i am having a problem with the rear ABS not working anymore so it just locks up the rear tires. i don't really know how to deal with that. any ideas?

Originally Posted by haulass350

Well i just got finished doing the conversion on my 97 truck parts list includes:

Kore 3 caliper brackets
96-97 Impalla Rotors #YH145033 "$52.00 each" @ Advance auto
79 Chevette Front Brake hoses #H86572 "$15.00 each" @ Advance auto
90 Chevrolet S-10 Calipers #184071/184072"$10.00 each" Pads #d154CT "$57.00"(Ceramics) @ Advance Auto
2 quarts of rear end dope + locker additive "12.00"
Differential gasket #RDS550281 "$4.00"

Along with having to Redrill the impalla rotor lug holes to 9/16 i had to file down a parts of the s-10 caliper to allow for the chevette lines to be used, i used a hand grinder and file other then that no modification was needed to make everything fit, i did have to cut off about 6 inches of the hard rear brake line to move it bck to make room for the chevette lines i did my best to photo the mod needed to the caliper. i test drove it and it seems fine checked everything for leaks, still a bit spongy so i gotta rebleed them when i get a spare set of pedel pushers. got any questions ask, and GL with your swapping


here are the pictures i took while doing the install

Brackets installed


Rotors on


where the caliper needed to be modified (sorry its blurry)


line installed


calipers on


everything bolted on

[oldred95]

Alright guys I've read virtually the whole tech article and I'm somewhat confused. First I will say what I've got and what I'm wanting. Got: 95 C1500 2wd with 10 bolt and 10 inch drum brakes. Want: Rear disc setup. Don't care about parking brake, it doesn't work as is anyway. Don't care about having a dust shield/brake backing plate either.


So far I've gathered I obviously need brackets. My choices seem to be Kore3 which judging by their website is either no longer in business, they are redoing their site, or they stopped making the bracket kits all together. Speedway Motors which doesn't seem to have the correct brackets either unless the ones I need aren't specifically shown to fit my application. Or the King Tek ebay brackets. Its a viable option but I'm not crazy about the price. Seems like there has to be something a little cheaper available.

The rotors I know, 94-96 Impala SS REAR rotors correct? 5 x 5 pattern and lug holes will need to be drilled to 9/16".

Next is calipers. There seems to be two options for my application. Caddy calipers which have an integrated parking brake (which I don't care for) or S10 calipers. As far as I'm aware of S10s never did have rear discs so I would be needing S10 front calipers and for what year?

For pads I would also need to get S10 brake pads as well correct?

The lines and hoses I can figure out easily enough.

[Low88]

Originally Posted by oldred95

Alright guys I've read virtually the whole tech article and I'm somewhat confused. First I will say what I've got and what I'm wanting. Got: 95 C1500 2wd with 10 bolt and 10 inch drum brakes. Want: Rear disc setup. Don't care about parking brake, it doesn't work as is anyway. Don't care about having a dust shield/brake backing plate either.


So far I've gathered I obviously need brackets. My choices seem to be Kore3 which judging by their website is either no longer in business, they are redoing their site, or they stopped making the bracket kits all together. Speedway Motors which doesn't seem to have the correct brackets either unless the ones I need aren't specifically shown to fit my application. Or the King Tek ebay brackets. Its a viable option but I'm not crazy about the price. Seems like there has to be something a little cheaper available.

The rotors I know, 94-96 Impala SS REAR rotors correct? 5 x 5 pattern and lug holes will need to be drilled to 9/16".

Next is calipers. There seems to be two options for my application. Caddy calipers which have an integrated parking brake (which I don't care for) or S10 calipers. As far as I'm aware of S10s never did have rear discs so I would be needing S10 front calipers and for what year?

For pads I would also need to get S10 brake pads as well correct?

The lines and hoses I can figure out easily enough.

Read 1 post above yours in the quoted text. It answered every one of your questions, with the exception of ... Impala REAR rotors.

[oldred95]

Mostly. I see that you used the Kore brackets. How much were they in comparison to the King Tek ones on ebay for 95 bucks? Would you recommend just going with a stock Impala rotor or getting drilled and slotted rotors? Baer Brakes drilled and slotted Impala SS rotors are 180 a pair. I do plan on getting GM Police Tahoe drilled and slotted rotors when I put lift spindles on and 35s so more stopping power seems like it would make sense. Also do the calipers come with mounting bolts and the banjo bolt and washers?

[Boost Infection]

Originally Posted by Boost Infection

Anyone have pics on the rear dics setup for a 6 lug 4x4 model?
Thanks

Mine was never answered

[oldred95]

Is King Tek my only option for brackets or is there something cheaper?

[N0DIH]

I have the parts to mock it up (96 K1500 Axle), but I don't have 2 arms, I just had rotator cuff surgery a few weeks back, I can't do anything like that for a while

I have the 77-79 10 bolt factory backing plates and calipers, as well as 94-96 B-Body Cop Car axle and calpers. I might have a set of front 6 lug rotors to see if they fit.

Just can't physically do it..

Originally Posted by Boost Infection

Mine was never answered

[FinalBreath]

Ive been doing alot of reading and cannot come up with a list I need. I have a 95 k1500 with the heavy duty chassis. What is a complete parts list I need to convert to a rear disk set-up while maintaining e-brakes?

[N0DIH]

HD chassis meaning RPO code F66? 9.5" axle? AKA the light duty K2500 (<GVW 7200)

[Heslekrants]

My local U-Pull-It only charges me $28 for the 10 bolt rear disc calipers & backing plates. I've bought 4 rear disc sets so far. I only live about 3 miles away so I visit the yard often.

This is the 14 bolt for my 99 Burb. I used the rear brakes from a 2000 Burb 10 bolt + a 60mm spacer.



If you want rear disc on a 5 lug rear the 77-78 Caddy DeVille rear disc are a direct swap for a fullsize 5 lug truck 5x5 bolt pattern. Just use the 79 Firebird rear rotors to get the 5x4 3/4 bolt pattern which is what we did on my Son's 74 Camaro.

[Skull Leader]

I still see this thread is still going strong!!! Since my Pops gave me his truck semi worn drums, I figured what the hell. I did the C5 Corvette conversion on my 97 Formula and used the Kore brackets. Nickel and dimed me to about $600 but it was well worth it. I'm probably going to get the KingTek brackets for $95 shipped. What do you guys think of these brand new Caddy calpiers for $100:

http://cgi.ebay.com/ebaymotors/HOT-R...Q5fAccessories

I will get some cheap rotors, pads and lines from Autozone.

[N0DIH]

The 76-79 B/D/E car rear calipers (big body) are the 2 3/8" piston calipers, the F-Body and 79-85 E Body are the 2" calipers.

The 2 3/8" calipers are more like fronts, they physically big calipers and more suited to truck use.

The cool part of the 76-81 rear discs (B/D/E and F) are all vented rotors not solids, so they handle high heat far better than solids.

[oldred95]

Just got back from Oreillys and got S10 front calipers, banjo bolts, Ceramic brake pads for the S10 calipers, and Chevette front brake hoses.

Just ordered the weld on soon to be bolt on brackets from Speedway Motors.

After that I ordered Summit Racing drilled and slotted Impala SS rotors. Grand total of 264 and change right now. All I have left to get is some brake line, and a couple brake line flare nut fittings. I'm going to be installing a different master cylinder which I got brand new for free that fits a NBS rear disc setup. It physically is a direct fit except for one of the flare nut fittings on my stock master cylinder is slightly bigger then the other so I just need to get two of the same for the NBS master cylinder and I'm good to go.

On the S10 calipers the pistons measure 2 3/8" diameter. Pretty beefy for a rear setup IMO. The pads are nearly as big as the front pads on my 95 as is.

[oldred95]

Alright I have a little more info on this subject pertaining to the brake lines. The Chevette brake hoses require a 3/8 x 24 fitting which comes standard on your average run of the mill 3/16" brake line. It appears the stock wheel cylinder and T fitting in the stock rear axle brake lines are all 3/8 x 24 fittings as well. Next, if you plan up upgrading to a NBS master cylinder that was intended for a rear disc setup be aware you may run into a difference in brake line fittings there as well. I know mine is different.

The rear line at the master cylinder (actually feeds the front brake circuit) is a 3/16" line with a 1/2 x 20 fitting on the stock OBS master cylinder. The front line (which actually feeds the rear brake circuit) is what I believe to be 9/16 x 18. The NBS master cylinder I have which is for a rear disc and possibly hydroboost setup uses a 1/2 x 20 fitting for both the front and rear brake circuits. Finding a 1/2 x 20 for 1/4" line was going to be nearly impossible, locally that is. Instead I was able to find a 1/2 x 20 fitting for 3/16" line and drill it out and redo the area that reinforces the flare of the line and make it fit a 1/4" brake line. Now I have all the correct fittings to put a NBS master cylinder specifically designed for rear discs on my OBS. Other then that the master cylinders are identical in mounting, push rod length and all. Just thought I would post a heads up on some minor fitting issues that can be run into while doing this.

[FinalBreath]

Originally Posted by N0DIH

HD chassis meaning RPO code F66? 9.5" axle? AKA the light duty K2500 (<GVW 7200)

RPO code F44. Yes 9.5 axle.

[MrGoodtime]

Originally Posted by haulass350

still rocking this setup, i had to finally replace the rear pads last week other then that everything is working great, although i am having a problem with the rear ABS not working anymore so it just locks up the rear tires. i don't really know how to deal with that. any ideas?

tell me if you get that fixed because i want to run into the least amount of problems possible when doing this swap

[oldred95]

The brakes are on. I had to drill the rotors to 9/16 of course, and then dremel out the big center hole a little to fit over the hub on the axle. I ended up using 7/16" grade 8 bolts to bolt the speedway bracket to the axle. Should be good to go. The only clearance issue I had was the stickie weights on my wheels. I had to take them because they would hit the calipers where they were at. I will just have to rebalance and stick the weights on in a different area of the wheel. Really pretty easy swap though. My only issue is the front brakes still have air. There is no air at the calipers and no air at the M/C so I'm thinking I need to do a ABS bleed but I can do that tomorrow at work.

Pics:
http://www.fullsizechevy.com/forums/...ml#post4272040

[Hicks-MofG]

KORE3 appears to no longer sell the rear conversion......