Drum brake swapping
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Drum brake swapping
OK, I got a pair of new drum assemblies for next to nothing, which is good since my driver's side front had an 'accident'. The problem is, the old brakes use 2 inch shoes while the new ones use 3 inch shoes. What is required to make these work? Different hubs? Different spindles? The drums fit perfectly, but the mounting depth for the current hubs are wrong.
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From: Simi Valley, CA
Originally Posted by HFMotorsports
OK, I got a pair of new drum assemblies for next to nothing, which is good since my driver's side front had an 'accident'. The problem is, the old brakes use 2 inch shoes while the new ones use 3 inch shoes. What is required to make these work? Different hubs? Different spindles? The drums fit perfectly, but the mounting depth for the current hubs are wrong.
Are you saying your current brakes are 11 x 2? That can't be, as ALL F100's 1968 and newer have 11 x 3 front brakes.
Last edited by NumberDummy; Apr 25, 2007 at 05:22 AM.
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From: East Central Florida
1st off I am going to presume you're talking about Front Brakes since you don't say.
You need to get & use backing plates for the 3" wide set up as they have a greater backset spacing than the 2" set up you have and are using now. Plus use the front wheel cyls for the larger 3" set up to engage the wider 3" shoes with corrtct stopping pressure apps. They all work thru 72s if taken from an F-100 or F-150 & direct bolt up to OEM 65-72 F100 spindle assy's.
Although above is remedy for front brake upgrades on 65-72, it is NOT the remedy for rear drum brake upgrades. They're a bit more complicated.
FBp
You need to get & use backing plates for the 3" wide set up as they have a greater backset spacing than the 2" set up you have and are using now. Plus use the front wheel cyls for the larger 3" set up to engage the wider 3" shoes with corrtct stopping pressure apps. They all work thru 72s if taken from an F-100 or F-150 & direct bolt up to OEM 65-72 F100 spindle assy's.
Although above is remedy for front brake upgrades on 65-72, it is NOT the remedy for rear drum brake upgrades. They're a bit more complicated.
FBp
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Sorry, 69 F100 2WD. Yes, front brakes. It does have 2" shoes on the front, but give how many other odd things I've found on this truck, that really doesn't surprise me 
... On the bright side, the last guy really did put a 390 in it (it came with a 360 from the factory).
Basically, it will probably be easier to find discs from a 73-79 and just replace the front brakes, wouldn't it?
... On the bright side, the last guy really did put a 390 in it (it came with a 360 from the factory).Basically, it will probably be easier to find discs from a 73-79 and just replace the front brakes, wouldn't it?
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From: East Central Florida
I'd say yes they will be easier to find, but beyond easier to find, the superior stopping ability of PD/Bs caught my attention. I've been doing that upgrade for nearly 20years, either that or frame swapping to achieve the later technologies. 
Please, if any of you want to disagree with my assessment of PDB vs Drums leave me out of the discussion this time. I'm not going back to Drum Brakes any time soon.
FBp
Please, if any of you want to disagree with my assessment of PDB vs Drums leave me out of the discussion this time. I'm not going back to Drum Brakes any time soon.
FBp
Last edited by FordBoypete; Apr 26, 2007 at 08:36 AM.
