Drivetrain Rear brake drum question

limp · Jul 9, 2024

I purchased these " universal " rear drums for my new rear end when I put it together..
Its hub centric so no movement up and down or side to side, but the holes for the wheel studs are slightly larger so I can turn the drum back a forth radially ( without the wheels on) and I get appx. 1/8 movement from one side of the stud to the other side....
One would think when the wheels are tightened down it should be OK, but I am wondering if during hard braking or acceleration if the drum could spin and clunk at times??
Anyone experienced this before??

Mustang5L5 · Jul 9, 2024

That's how a lot of slip on style brake rotors are as well. There's a little slop

Really, the lugs aren't meant to hold the rotor/drum from spinning. It’s hubcentric. When properly torqued down, the flat face of the axle/hub presses against the inside of the drum and that frictional force should prevent any rotation. Same concept as many wheel spacers.

limp · Jul 9, 2024

Mustang5L5 said:
That's how a lot of slip on style brake rotors are as well. There's a little slop

Really, the lugs aren't meant to hold the rotor/drum from spinning. When properly torqued down, the flat face of the axle/hub presses against the inside of the drum and that frictional force should prevent any rotation. Same concept as many wheel spacers.

Thanks for the help.... I have probably seen this in the past but I wasn't paying attention to it....

Mustang5L5 · Jul 9, 2024

If it helps you sleep bettter at night….

Wheel spacer safety, and the physics of keeping the wheels on

Willybill32 · Jul 13, 2024

limp said:
I purchased these " universal " rear drums for my new rear end when I put it together..
Its hub centric so no movement up and down or side to side, but the holes for the wheel studs are slightly larger so I can turn the drum back a forth radially ( without the wheels on) and I get appx. 1/8 movement from one side of the stud to the other side....
One would think when the wheels are tightened down it should be OK, but I am wondering if during hard braking or acceleration if the drum could spin and clunk at times??
Anyone experienced this before??

I have a new (well, new when I bought them!) set of aftermarket drums for an ‘86. I decided to upgrade to rear discs before I rebuilt the rear brakes. I don’t know if they fit or not, but they’re yours for the shipping charges.

Bill

Robertstang · Jul 13, 2024

To center the drum adjust the brake shoes outwards until it stops. The drum should now be centered. Put the wheel on and tighten down the nuts. Back off the shoes a little and you should be fine. The torqued down wheel should prevent any brake drum slippage. Of course this is just a theory so what you find in practice could be different. LOL

85GTStangGuy · Jul 13, 2024

The brake drum (assuming it's the correct one for the application) will always be centered due to it being hub centric. Being able to rotate the drum a bit on the studs doesn't change the fact that the drum is still centered, no matter where the lug studs are in relation to the holes they poke through.

limp · Jul 13, 2024

85GTStangGuy said:
The brake drum (assuming it's the correct one for the application) will always be centered due to it being hub centric. Being able to rotate the drum a bit on the studs doesn't change the fact that the drum is still centered, no matter where the lug studs are in relation to the holes they poke through.

The drum is centered.. As the above says it is hub centric...

limp · Jul 13, 2024

Willybill32 said:
I have a new (well, new when I bought them!) set of aftermarket drums for an ‘86. I decided to upgrade to rear discs before I rebuilt the rear brakes. I don’t know if they fit or not, but they’re yours for the shipping charges.

Bill

I can't thank you enough for the generous offer, but I don't think they will fit my rear end....

Noobz347 · Jul 14, 2024

limp said:
I can't thank you enough for the generous offer, but I don't think they will fit my rear end....

Um... ok.

Mustang5L5 · Jul 15, 2024

Oh man. That's a good CT but might be going a bit too far.

limp · Jul 15, 2024

Noobz347 said:
Um... ok.

These drums are around 2 inches larger in diameter than the drums on the 7.5" rear that came out of the car...
They were purchased as a package, with backing plates.. the brakes came installed to the backing plates.... I am assuming the 8.8 are close to the 7.5" drums?

Drivetrain Rear brake drum question

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

limp

wrap a little cheese around it and its a done

Mustang5L5

That is…until I whipped out my Bissell

Willybill32

But at least it's tight!

Robertstang

Member

85GTStangGuy

limp

wrap a little cheese around it and its a done

limp

wrap a little cheese around it and its a done

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Mustang5L5

That is…until I whipped out my Bissell

limp

wrap a little cheese around it and its a done

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Drivetrain Rear brake drum question

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

wrap a little cheese around it and its a done

That is…until I whipped out my Bissell

But at least it's tight!

Member

wrap a little cheese around it and its a done

wrap a little cheese around it and its a done

Stangnet Facilities Maint Tech... Er... Janitor

That is…until I whipped out my Bissell

wrap a little cheese around it and its a done

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