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Old 04-11-2004, 02:13 AM   #1
swervin ervin
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Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
My rear disc conversion

Well today, sore fingers and all, I started stripping down all the brake stuff on the truck. I couldn't take not doing anything any longer. I haven't got the plans for the rear disc conversion yet, but I have a good idea of what I'll be doing.

I ordered my disc/disc master cylinder and combination valve. I found out I don't need a new booster. I took off the master cylinder and combination valve, removed the drums and brake shoe stuff. Took off the rear end cover and drained all the grease. Probably Monday I pull the axles and remove the backing plates.

The plans show the caliper mounted at the top, which from all my reading won't work right. The bleeder fitting needs to be at 12:00 in order to be able to bleed all the air out of the system. I plan to rework the mounting brackets so I can mount the caliper like it should be, which is just about horizontal, or like the fronts.

I've seen where a lot of folks have trouble with brake bias and low pedal when converting to rear discs. In order for the rear discs to work right, you must use a disc/disc master cylinder and combination valve. This solves the problem of fluid level for the rears and the disc/disc valve solves brake bias problems. Also a disc/drum master cylinder don't have enough pressure for rear discs. A disc/drum combination valve will cause the rear discs to drag because it has a built in residual valve which is needed to keep pressure on the brake shoes so they will stay close to the drum.

Not sure yet on what calipers I will use. I know the ones for the Sevilles have a built in park brake but I don't care for having to use the park brake everytime I park the truck. This is the way these calipers adjust the brakes. A standard caliper like the fronts are self adjusting, but have no park brake feature. I don't ever use a park brake so I might just go with a front style caliper. I found out if you do use Seville type calipers and don't use the park brake feature, it will quit working. I believe I will need to resize the axle flange so the rotor will slide over it. I'll find out more on this when I get the plans and dimensions.

Can't wait to get started on the brackets. I love to fabricate stuff from scratch. Having plans will make this process easier. I'll keep everyone up to date on how everything goes.
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Mike

1985 Chevy C-10
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