My Bronco is EATING TIRES

Ksnau

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Sorry this is long and we'll probably repeat what other people have said .

Not sure what you're driving is like but when I was driving my mustangs if I had to slam on my brakes that can cause flat spots if the lock up. Same with accelerating really fast and spinning the tires, but I assume that's a lot less likely with this vehicle but it can happen off-roading too.

Also Yes, make sure that you're rotating your tires. I do mine every oil change but I think recommended every 7500iles.

I know it's been touched upon but PSI is really important and remember it changes with temperature. If you read the tire pressure when they're cold, it's going to change because of the air inside there gets hotter. It gets denser and so that's going to make it read a lower PSI. Same. If you go into a cold environment, it'll expand and read a little higher, but I don't think I've ever had it. Had too big of fluctuations from this.

Also remember these are independent suspension vehicles so it's not a straight axle. The car moves in an arc as it goes up and down so the tire contacts the ground at different angles. But for this to affect it, the car would have to be riding at a different height a lot of the time.

I think that once you 've checked your tires and they're at the right PSI and then checked your alignment. It's got to be something with the suspension unless like the car's subframes and body somehow got twisted and so it's riding wrong no matter what. I would say it has to be something in the suspension. Maybe you could measure the height that the suspension is riding at from a few different points and then measure another bronco sport of the same trim and see if it's riding at the same heights. Maybe your springs or shocks are messed up and it's sagging or I was just helping a friend with his broncos sport and after we jacked it down and put the tire back on that tire actually got stuck like an inch higher than the other tire and it didn't undo itself until we took off the parking brake and started driving. So maybe it's binding somewhere and the suspension and it's not riding at the right height for all the tires.
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thomasm23

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Sorry this is long and we'll probably repeat what other people have said .

Not sure what you're driving is like but when I was driving my mustangs if I had to slam on my brakes that can cause flat spots if the lock up. Same with accelerating really fast and spinning the tires, but I assume that's a lot less likely with this vehicle but it can happen off-roading too.

Also Yes, make sure that you're rotating your tires. I do mine every oil change but I think recommended every 7500iles.

I know it's been touched upon but PSI is really important and remember it changes with temperature. If you read the tire pressure when they're cold, it's going to change because of the air inside there gets hotter. It gets denser and so that's going to make it read a lower PSI. Same. If you go into a cold environment, it'll expand and read a little higher, but I don't think I've ever had it. Had too big of fluctuations from this.

Also remember these are independent suspension vehicles so it's not a straight axle. The car moves in an arc as it goes up and down so the tire contacts the ground at different angles. But for this to affect it, the car would have to be riding at a different height a lot of the time.

I think that once you 've checked your tires and they're at the right PSI and then checked your alignment. It's got to be something with the suspension unless like the car's subframes and body somehow got twisted and so it's riding wrong no matter what. I would say it has to be something in the suspension. Maybe you could measure the height that the suspension is riding at from a few different points and then measure another bronco sport of the same trim and see if it's riding at the same heights. Maybe your springs or shocks are messed up and it's sagging or I was just helping a friend with his broncos sport and after we jacked it down and put the tire back on that tire actually got stuck like an inch higher than the other tire and it didn't undo itself until we took off the parking brake and started driving. So maybe it's binding somewhere and the suspension and it's not riding at the right height for all the tires.
Air pressure, psi, in tires will increase as the temperature increases. The psi will decrease as temperature decreases.

Elevation can change psi. As you increase elevation, the tire’s psi will increase.
 

NMhunter

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Tire pressure should always be checked cold. Early morning before it has been driven and before the sun is shining on the east facing tires. We get some extreme temperature changes here in NM, but tire pressure rarely changes more than 3 or 4 psi. If you have to fill one while the tires are warm, compare it with the other tires on the vehicle.
 

Ksnau

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Sorry if I got backwards but yeah make sure your checking every now and then. And I'll admit I do use the display too often. But I do sometimes still get a real gauge and check the tire pressure.
 
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Scapino

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For what it is worth if anything, check to see where your Coopers were made.
My local, independent tire place turned me on to Coopers years ago and I have had phenomenal success with them, including those specific tires on my Mustang. The shop no longer sells the brand, removed their sign, etc due to quality control issues and manufacturing over seas.
How do I determine where my Coopers were made?
 


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Scapino

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Changing the fluid has fixed rear diff issues for some users, but unless you know that's the issue you could be wasting time/money. You need to take it to a shop to have it diagnosed. I would be sure you know the conditions to recreate the noise you're hearing, and request a test drive with the technician so you can be sure they hear it the way you do. Don't count on your description of the noise to aid in diagnosis.
UPDATE:
I was out of town for 10 days. I left the Bronco with my local shop while I was gone. He (the mechanic) easily reproduced the 'binding' noise I described. He confirmed it was a Diff issue. He drained and replaced the diff fluid and said it seems better. I've been driving it now for 500+ miles and all seems good (actually seems to drive a bit smoother). The shop charged $140 total - $80 for .75hrs labor plus $60 for the fluid. He said that fluid is damn expensive (I checked, Amazon has it for $30/qt). I asked, but he said he didn't see anything in the fluid when he drained it. Said it looked clear. I am happily dumbfounded about this. Happy that it was only $140, but dumbfounded that it required a diff fluid change so early (60k miles).

Anyway, I've got a new set of tires on order. I'm giving up on Coopers (had a bad experience with Coopers on my Sport Trac years ago, and now with the Bronco) and going with GT this time. I hope to have them installed by Wednesday...

This is maybe something I should have mentioned earlier. The Bronco came from the dealer with 18" tires. When searching for new tires, a lot of the search tools say that they (225/60r18) don't fit my vehicle. I know not all Broncos come with 18" tires, but they do all fit 18" tires right. IDK, weird.
 

Jmuns

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UPDATE:
I was out of town for 10 days. I left the Bronco with my local shop while I was gone. He (the mechanic) easily reproduced the 'binding' noise I described. He confirmed it was a Diff issue. He drained and replaced the diff fluid and said it seems better. I've been driving it now for 500+ miles and all seems good (actually seems to drive a bit smoother). The shop charged $140 total - $80 for .75hrs labor plus $60 for the fluid. He said that fluid is damn expensive (I checked, Amazon has it for $30/qt). I asked, but he said he didn't see anything in the fluid when he drained it. Said it looked clear. I am happily dumbfounded about this. Happy that it was only $140, but dumbfounded that it required a diff fluid change so early (60k miles).

Anyway, I've got a new set of tires on order. I'm giving up on Coopers (had a bad experience with Coopers on my Sport Trac years ago, and now with the Bronco) and going with GT this time. I hope to have them installed by Wednesday...

This is maybe something I should have mentioned earlier. The Bronco came from the dealer with 18" tires. When searching for new tires, a lot of the search tools say that they (225/60r18) don't fit my vehicle. I know not all Broncos come with 18" tires, but they do all fit 18" tires right. IDK, weird.
Yea your Outer Banks came with 225/60/18 tires. Most tire retailers should have that come up as the OEM tire unless you’re selecting Bronco and not Bronco Sport from the dropdown.
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