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Old 10-05-2009, 09:27 PM   #1 (permalink)
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85 F-250 Diesel rear brakes...

I'm working on the rear drum brakes on my 85 F-250 diesel and the drums are wore the hell out! I went to buy some new ones at Napa and the parts guy asked me if they were hub mount or flange mount. What is the difference?

I'm assuming that they are hub mount because they are mounted behind the hub with the studs pressed through... BUT I've never even heard of or seen flange mounted drums... Anyone know anything about it?

I believe the rear axle is a Dana 70, but not 100% sure.
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Old 10-05-2009, 09:33 PM   #2 (permalink)
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IMO flange mount would be a semi-float.. hub mount would be full-float
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Old 10-05-2009, 09:59 PM   #3 (permalink)
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That makes sense...

Some of those mid 80's 3/4 tons did have a semi-float 60 didn't they... ghey!
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Old 10-07-2009, 08:18 AM   #4 (permalink)
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Originally Posted by billybob_81067 View Post
I'm working on the rear drum brakes on my 85 F-250 diesel and the drums are wore the hell out! I went to buy some new ones at Napa and the parts guy asked me if they were hub mount or flange mount. What is the difference?

I'm assuming that they are hub mount because they are mounted behind the hub with the studs pressed through... BUT I've never even heard of or seen flange mounted drums... Anyone know anything about it?

I believe the rear axle is a Dana 70, but not 100% sure.
If the axle has a smooth top and bottom like this one, its a 70u.



If you look at these 3 axles the first is a 1994 Dana60, the second is the Dana70u and the third is a 14 bolt. On both of the Dana axles it looks like the brakes are identical except the Dana 60 has slide on drums and the Dana 70 has them pressed fromt he back. I would assume if you wanted disks you could buy the Dana 60 disk brake adapters for it.
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Old 10-07-2009, 09:46 AM   #5 (permalink)
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Hub mount and flange mount have nothing to do with full float or semi float. Full float axles can have either style, more commonly referred to as inboard or outboard drum.
Flange mounted, or Inboard mean they are mounted to the wheel hub via the lug studs. The studs are a slip fit through the hub flange and pressed into the drum. The press fit of the studs holds the drum concentric to the hub, making the hub and drum an assembly.
Hub mount, hub piloted, or Outboard is where you can simply remove the drum off the hub after the wheel is off. The lug studs do not press fit into the drum, they are a just slip through the drum. The drum is positioned concentric to the hub by the slip fit of the drum center hole over the pilot land on the hub.

Last edited by FF3PM; 10-07-2009 at 10:05 AM.
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