Drums to disk

vancefish · Post by **vancefish** » Wed Apr 22, 2015 10:01 pm

Hello I have a 69 f250 highboy. And I'm in the process of installing a disk brake front axle out of a 79 truck. I was wondering if I need to use the master cylinder out of the 79 truck? Or just need to install a praportioning valve?

HIO Silver · Post by **HIO Silver** » Wed Apr 22, 2015 11:06 pm

A disc/drum master cylinder is required. A drum/drum master cylinder lacks sufficient volume to push the caliper's pistons.

Ya might be able to a 79 MC but the system will still need a proportioning valve or disc/drum combo valve regardless.

ultraranger · Post by **ultraranger** » Thu Apr 23, 2015 9:43 pm

It would be best not use the MC off the donor truck. Get a brand new one from the parts store.

The most gain from the new disc brakes will be through the installation of a brake booster.

vancefish · Post by **vancefish** » Tue Apr 28, 2015 8:26 pm

Ok thanks for the help. What about swapping the rear brakes to disks. I was thinking of getting an axle out of an early 90s super duty. Has anyone done this?

HIO Silver · Post by **HIO Silver** » Tue Apr 28, 2015 9:07 pm

vancefish wrote:Ok thanks for the help. What about swapping the rear brakes to disks. I was thinking of getting an axle out of an early 90s super duty. Has anyone done this?

Swapping an entire axle or swapping drums to discs on a 9-inch?

It's alot more effort with the former since it'll likely require relocating leaf pads and shock brackets. The latter is served by the aftermarket for which there is a plethora of options.

The most lo-buck 9-inch conversion is a JY swap: Pirate 4x4 Thread: 9-inch Rear Discs for Under $100

Then there are systems like that offered by TSM: TSM Manufacturing: Ford 9-inch Rear Disc Brake Kit

stldesign · Post by **stldesign** » Fri May 01, 2015 8:26 am

We are using a big bore master cylinder and disc drum prop valve from wild horse 4x4. We are installing a dana44 from a 78 in our 69. Doses your rear gears match your front?

vancefish · Post by **vancefish** » Tue May 05, 2015 8:19 pm

I have a dana 60 in the rear not a 9inch. So that's why I was thinking of an entire axle swap.

Your questions about the ratio is a yes and a no. My rear end ratio is 4.10. But the front is a 4.09. They use to put a slightly faster ratio in the front to keep it going in a straight line I believe

flyboy2610 · Post by **flyboy2610** » Wed May 06, 2015 10:14 am

vancefish wrote:I have a dana 60 in the rear not a 9inch. So that's why I was thinking of an entire axle swap.

How about a Wildwood rear disc brake kit? It's a bolt on job.
http://www.ebay.com/itm/WILWOOD-DISC-BR ... 08&vxp=mtr

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