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Old 02-18-2020, 09:49 AM #1
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Help with Banging Sound When in Drive and Accelerate

Sorry folks long title but racking my brain for cause. Behavior is intermittent and the title doesnt describe noise well, it feels/sounds like when a caliper breaks free thats seized to rotor. The oddness is it never happens when I put in reverse 1st to back out but when shift it into drive and press gas pedal the noise happens.

I have inspected brake shoes and calipers with no silver bullet found. It happens when it sits for a while historically but cant tie it to specific duration of sitting.

I am open to other possible causes for this and why putting in reverse doesnt cause an issue but when put into drive right after reverse the behavior exists. Drove at length yesterday after sitting for a while (approx 1 week) and no issue.
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Old 02-18-2020, 10:04 AM #2
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Take it to a shop that has several lifts and have them find the problem. Get oil and filter at same time.

Could be a wheel bearing. Could be front alignment part (bushing) needing replacement.

What year? Hoe many miles?
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Old 02-18-2020, 10:18 AM #3
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99 Highlander 71k miles

Has been to shop, no problem found (NPF). Oil was just done in Dec and <1000 miles on it and full PPI completed with NPF.
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Old 02-18-2020, 11:19 AM #4
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check the u joints for play and flex plate for cracks if auto.
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Old 02-18-2020, 11:49 AM #5
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This sounds like gear oil on the rear brake shoes. Check rear axle seals. Yes, gear oil on rear shoes can cause front calipers to grab, it also causes the rear shoes to grab especially when cold. Check for clogged diff breather too.
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Old 02-18-2020, 12:45 PM #6
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Quote:
Originally Posted by 97Cruiser40th View Post
Sorry folks long title but racking my brain for cause. Behavior is intermittent and the title doesnt describe noise well, it feels/sounds like when a caliper breaks free thats seized to rotor. The oddness is it never happens when I put in reverse 1st to back out but when shift it into drive and press gas pedal the noise happens.

I have inspected brake shoes and calipers with no silver bullet found. It happens when it sits for a while historically but cant tie it to specific duration of sitting.

I am open to other possible causes for this and why putting in reverse doesnt cause an issue but when put into drive right after reverse the behavior exists. Drove at length yesterday after sitting for a while (approx 1 week) and no issue.
Have someone drive the car while you stand outside of it to narrow down the location of the noise
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Old 02-18-2020, 12:47 PM #7
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Quote:
Originally Posted by badattitude View Post
This sounds like gear oil on the rear brake pads. Check rear axle seals. Yes, gear oil on rear shoes can cause front calipers to grab, it also causes the rear shoes to grab especially when cold.
I had the same issue and this was the reason.
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Old 02-18-2020, 02:17 PM #8
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Driveshaft slip joint? That would happen when driving off after coming to a (semi-hard) stop too.

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Old 02-18-2020, 03:02 PM #9
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Quote:
Originally Posted by badattitude View Post
This sounds like gear oil on the rear brake shoes. Check rear axle seals. Yes, gear oil on rear shoes can cause front calipers to grab, it also causes the rear shoes to grab especially when cold. Check for clogged diff breather too.
Thanks folks for all replies

This was my initial thought as well yanked both front and rear off though the sound seemed come from rear and all dry.

Havent checked breather but will do so.

Would cracked axle seals cause this issue?

I just dont understand why this doesnt happen in reverse.
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Old 02-18-2020, 03:08 PM #10
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Yes, leaking or cracked axle seals cause the weird brake sticking. Not sure why its not happening in reverse. It did for me. Mine would require a bit of throttle to back up after sitting. Then would pop, release and be fine until I parked again. The leaking rear seal also caused the front calipers to lock up when coming to a slow stop. Super weird I know.
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Old 02-18-2020, 05:11 PM #11
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Quote:
Originally Posted by badattitude View Post
Yes, leaking or cracked axle seals cause the weird brake sticking. Not sure why its not happening in reverse. It did for me. Mine would require a bit of throttle to back up after sitting. Then would pop, release and be fine until I parked again. The leaking rear seal also caused the front calipers to lock up when coming to a slow stop. Super weird I know.
Mine didn't do it in reverse either.
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Old 02-19-2020, 12:49 PM #12
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Thanks agin all, sounds like with absence of leaking diffs contributing to sticking shoes and pads the next likely culprit is axle seals?
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Old 02-19-2020, 01:39 PM #13
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Quote:
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Thanks agin all, sounds like with absence of leaking diffs contributing to sticking shoes and pads the next likely culprit is axle seals?
That's the same problem. The leak comes out inside the brake drum area and gets on the brake shoes. Unless you removed the brake shoes to check for oily build-up inside, you won't know if that is your problem or not.

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Old 02-19-2020, 02:47 PM #14
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Quote:
Originally Posted by phattyduck View Post
That's the same problem. The leak comes out inside the brake drum area and gets on the brake shoes. Unless you removed the brake shoes to check for oily build-up inside, you won't know if that is your problem or not.

-Charlie
Thanks Charlie my bad on terms. I am told the front axle boots are torn and leaking grease, would that be a cause of my issue? I could not verify this and relying on a shops inspection. I did not see any sign of grease thrown around.

I have pulled all 4 corners of wheels and no sign of any leaks or impingement to shoes or pads.
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Old 02-19-2020, 03:55 PM #15
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Quote:
Originally Posted by 97Cruiser40th View Post
Thanks Charlie my bad on terms. I am told the front axle boots are torn and leaking grease, would that be a cause of my issue? I could not verify this and relying on a shops inspection. I did not see any sign of grease thrown around.

I have pulled all 4 corners of wheels and no sign of any leaks or impingement to shoes or pads.
Yes, that could be the cause of your issue. Especially if it's been torn for a while, dried up, and had debris in the CV.

Also, a leaking axle is visible without having to put forth any work. Just look at the inside of your rear tires. You'll see the fluid running down the tire.

Mike
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