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Drum to disc conversion

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Old Mar 27, 2025 | 06:14 PM
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Drum to disc conversion

Hi all, I have a 1979 F100 with drum brakes. How to I convert to disc? What other model disc brakes will fit? Thanks.
 
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Old Mar 27, 2025 | 07:58 PM
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https://www.speedwaymotors.com/shop/...57-3-495-30460

I'd shop for a quality kit. Something to help you stop in modern traffic.
 
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Old Mar 27, 2025 | 07:59 PM
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Google is your friend. I would do a search for your year truck. There are many kits out there for the front. For the rear it goes by the type of rear end in the truck. For example, I have a dana 60. I found on, iirc, Full size Bronco Forum that with a D-60 I could use the rotors and calipers off a Chevy truck front of the same year. I also found a small shop with the brackets.
Good luck. You know, I wanted to add something: Do a lot of reading before you throw out a lot of money. I'm thinking that that year truck must have come with a front disc option. If so, you should be able to find everything you need at the junkyard for pennies on the dollar. And rebuilding calipers is the easiest thing to rebuild in the world! I also wanted to mention that converting to disc in my rear did not improve my trucks stopping ability. However, once I swapped in a hydroboost unit, the difference was night and day. That conversion brought my truck into the new millinium of driveability. What I found to be the greatest advantage to disc brakes is the dependability, the build it and forget it factor.
 
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Old Mar 27, 2025 | 11:35 PM
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When searching those numerous internet bolt or weld on kits. Look for one that offers the ability to have or be able to set a park brake. You might also look into a Line Lock set up for the brake system. Also research about it you have to change your proportional valve to go from 2 disk 2 drum, to just 4 disk.
 
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Old Mar 28, 2025 | 10:11 AM
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Originally Posted by 77&79F250
When searching those numerous internet bolt or weld on kits. Look for one that offers the ability to have or be able to set a park brake. You might also look into a Line Lock set up for the brake system. Also research about it you have to change your proportional valve to go from 2 disk 2 drum, to just 4 disk.
Wait a minute. He has 4x drums, doesn't he? That's what I understood.
The thread starter might want to consider going with disc in the front, powered by the dual diaphragm booster, and retaining the drums in the rear to keep his parking brake. Oh, and another post mentioned calipers with a parking brake. They are crapola and a waste of $$. And line locks may only hold for 10 minutes or so. If you have to have a p. brake, either keep your existing drums or swap the entire rear end for a 2005 SuperDuty rear with discs and mini drums for the p.brake.
 
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Old Mar 28, 2025 | 11:59 AM
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A '79 should be front disc/rear drum as far as I know. Last year of drums on the front was '75 if I remember correctly. At least on the F100/150 trucks.

I went with a bolt on kit for the rear from TSM Mfg. It uses Chevy calipers, you can use front calipers but won't have a parking brake. I went with rear calipers from a '79 Cadillac El Dorado. So far those calipers have worked well for me, but others have not had very good luck with those calipers, especially if you have bigger tires. Some 15 inch wheels will not work with this setup. The 15 inch steel wheels I had hit the caliper. I tried to take a small amount of the caliper to make clearance but it wasn't enough. You can use spacers (not a fan) find a 15 inch wheel that will work or go with a bigger wheel. I chose to go with 16 inch wheels.










 
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Old Mar 28, 2025 | 12:04 PM
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I changed the combination/proportion valve too since disc/disc uses a different bias than disc/drum

https://shop.broncograveyard.com/Disc-Disc-Pro-Valve/productinfo/22519D/
https://shop.broncograveyard.com/Dis...ctinfo/22519D/



 
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Old Mar 28, 2025 | 12:29 PM
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Originally Posted by mterickson
A '79 should be front disc/rear drum as far as I know. Last year of drums on the front was '75 if I remember correctly. At least on the F100/150 trucks...............
Yep.
 
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Old Mar 28, 2025 | 04:35 PM
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I highly recommend on resurfacing your differential axle so your rotors could sit flat and not have a gobble.
 
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Old Mar 29, 2025 | 11:52 AM
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I have nothing against the 76 El Dorado rear calipers as far as their braking goes. However, it is their parking brake mechanism that is the problem. They are notorious for not working. Google them and read all the bad reviews. I have used two different types and neither would keep my truck from rolling on a very slight grade. Please, don't waste your $ on them. Go with the chevy front calipers for your rear end and mount them on a bolt on bracket.
 
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Old Mar 29, 2025 | 07:41 PM
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Originally Posted by F-250 restorer
I have nothing against the 76 El Dorado rear calipers as far as their braking goes. However, it is their parking brake mechanism that is the problem. They are notorious for not working. Google them and read all the bad reviews. I have used two different types and neither would keep my truck from rolling on a very slight grade. Please, don't waste your $ on them. Go with the chevy front calipers for your rear end and mount them on a bolt on bracket.
So far, the parking brake has worked for me. I haven't tested it on any steep grades, but it keeps my truck from rolling (manual transmission) when it is idling in the driveway that has a slight grade towards the street.

I would prefer to have a parking brake on the rear output of the transfer case, but all the pre-built options I have found for that were quite expensive.

I am planning to put Dana 60 or similar under the rear. The bolt on kit with rebuilt calipers was something to get me by until I can afford heavier duty axles or a donor truck with the axles I want.
 
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