Drivetrain Rear noise while braking.

91GTstroked · Jul 3, 2024

Hey everyone,

Looking for a little help here. I noticed the other day while braking and coming to a stop I could hear some rear noise. I initially thought loose lug nuts or bent axle.

So I rocked each rear wheel in and out while the car is on the ground and it's making a clunk noise. I can make this happen if pushing on the body of the car as well. Almost like the rear drums are making the sound.

Car is mostly original with 27,700 miles.

Any suggestions?

limp · Jul 3, 2024

Some noise is normal, but it sounds like this is a new noise?
Jack the car up and pull off the drums to see if anything is broken or if you have any fluid leaks...

91GTstroked · Jul 3, 2024

limp said:
Some noise is normal, but it sounds like this is a new noise?
Jack the car up and pull off the drums to see if anything is broken or if you have any fluid leaks...

I'm honestly not sure if this is a new noise. I barely drive this car. The only reason that I heard it the other day is because I had the stereo volume way down.

I've only driven this car maybe 200-300 miles since I bought it a couple years ago. I did add 17" pony wheels a couple years ago.

limp · Jul 3, 2024

From just sitting, some rust or a leak could of developed...

General karthief · Jul 3, 2024

Pushing on the wheel sideways they all clunk a little, a quick drum pull and check is in order, also fluid level.

91GTstroked · Jul 3, 2024

limp said:
From just sitting, some rust or a leak could of developed...

It's just weird. Rocking the car back and forth side to side while the car is stationary. It makes a clunk sound on each side of the wheel area.

Mustang5L5 · Jul 3, 2024

The axle shafts do move in and out slightly. It's even more exaggerated as the clutch packs wear. Front and back clunk could be slop in the universals

Does the noise go away if you set the parking brake hard?

91GTstroked · Jul 3, 2024

Mustang5L5 said:
The axle shafts do move in and out slightly. It's even more exaggerated as the clutch packs wear. Front and back clunk could be slop in the universals

Does the noise go away if you set the parking brake hard?

So the noise does go away when I set the parking brake.

Mustang5L5 · Jul 3, 2024

I'd put the rear on jackstands and pull a wheel or both off. Take some large washers and snug a few lugs down and then see if you can pull the axle/drum in and out and replicate the noise.

I bet it's axle movement. There should be some, but not excessive. Usually as the clutch packs wear down, extra space is created so the axles can move side to side more. I forget the spec on max movement however....i'd have o search

91GTstroked · Jul 3, 2024

Mustang5L5 said:
I'd put the rear on jackstands and pull a wheel or both off. Take some large washers and snug a few lugs down and then see if you can pull the axle/drum in and out and replicate the noise.

I bet it's axle movement. There should be some, but not excessive. Usually as the clutch packs wear down, extra space is created so the axles can move side to side more. I forget the spec on max movement however....i'd have o search

Thanks for the tips. I'll give that a try. Might have to wait until next week. I have family coming to visit.

keel · Jul 3, 2024

I've had some bad drum brakes that would make noise when coming to a stop, I think the drums might have been warped. It would make a rhythmic soft clunking noise whenever I had the brakes applied lightly at low speed and you could feel it too.

Could also maybe be a bad bushing or spring isolator.

Noobz347 · Jul 3, 2024

If your brakes all checkout and you don't find anything wrong then it's time to take a look at the upper and lower control arm bushings.

You say the cars sits a lot. If those bushing are original, they're likely dry rotted. Same with the shock, quad-shock, and stabilizer bar bushings.

91GTstroked · Jul 4, 2024

Noobz347 said:
If your brakes all checkout and you don't find anything wrong then it's time to take a look at the upper and lower control arm bushings.

You say the cars sits a lot. If those bushing are original, they're likely dry rotted. Same with the shock, quad-shock, and stabilizer bar bushings.

Suspension components all look original. Still rocking the OEM spark plug wires as well.

Willybill32 · Jul 7, 2024

91GTstroked said:
Hey everyone,

Looking for a little help here. I noticed the other day while braking and coming to a stop I could hear some rear noise. I initially thought loose lug nuts or bent axle.

So I rocked each rear wheel in and out while the car is on the ground and it's making a clunk noise. I can make this happen if pushing on the body of the car as well. Almost like the rear drums are making the sound.

Car is mostly original with 27,700 miles.

Any suggestions?

Since you added 17” Pony wheels, it’s possible the wheels are hitting the quad shocks. I reversed my quad shocks for clearance when I put my 17” X 9” Pony wheels on the rear.

Bill

91GTstroked · Jul 10, 2024

Willybill32 said:
Since you added 17” Pony wheels, it’s possible the wheels are hitting the quad shocks. I reversed my quad shocks for clearance when I put my 17” X 9” Pony wheels on the rear.

Bill

I checked clearance while the car is at a stand still and it looks fine. Maybe while I'm driving it's rubbing. I'll double check.

Drivetrain Rear noise while braking.

91GTstroked

Attachments

limp

wrap a little cheese around it and its a done

91GTstroked

limp

wrap a little cheese around it and its a done

General karthief

wonder how much it would cost to ship you a pair

91GTstroked

Mustang5L5

That is…until I whipped out my Bissell

91GTstroked

Mustang5L5

That is…until I whipped out my Bissell

91GTstroked

keel

Active Member

Noobz347

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

91GTstroked

Willybill32

But at least it's tight!

91GTstroked

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Drivetrain Rear noise while braking.

Attachments

wrap a little cheese around it and its a done

wrap a little cheese around it and its a done

wonder how much it would cost to ship you a pair

That is…until I whipped out my Bissell

That is…until I whipped out my Bissell

Active Member

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

But at least it's tight!

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