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  • November 25, 2024, 07:03:53 AM

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Author Topic: Hopping rear tire  (Read 3849 times)

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Offline 82 amc eagle xchp

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Hopping rear tire
« on: March 24, 2014, 04:44:18 AM »
My 82 Eagle  has a bad  right rear wheel hop when the brakes applied hard. I have turned the drums and it  has new kyb shocks. Around 20 years ago a drive shaft builder guy was looking at the car. and said "see how that spring is flatter than the other its bad"  I don't drive the car much any more.  I take it to car shows. Any one else think its the springs?
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Offline mudkicker715

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Re: Hopping rear tire
« Reply #1 on: March 24, 2014, 08:30:04 AM »
Shocks stop the bounce. Not the spring. Recheck the bad shock
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Offline BenM

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Re: Hopping rear tire
« Reply #2 on: March 24, 2014, 02:11:45 PM »
It sounds less like a spring issue and more like a sticky brake.

The easiest things to check are the hard line and the brake cylinder. If it's pinched one wheel will get more pressure than the other, and since the lines are unequal it's easy for it to affect one side. Even a misaligned exhaust can begin to flatten a hard line. A weeping cylinder will cause the same symptoms and just a few drops of fluid can cause problems, it doesn't have to be noticeable with the drums on.

It could also be a partially collapsed soft line from the body to the axle, again the uneven lines and a bit of wear could make one wheel more sensitive to the effects of the collapsed line. They can act as check valves preventing fluid from flowing back as quickly as it enters.

Next I'd suspect a ridge or dirt in the wheel cylinder. Wheel cylinders are very cheap, and if there's dirt in it you may as well replace rather than clean them for the peace of mind.

Brakes are important enough that I wouldn't hesitate to replace original soft lines and cylinders just due to age.
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Offline IowaEagle

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Re: Hopping rear tire
« Reply #3 on: March 24, 2014, 02:16:10 PM »
If the shoes are glazed that could happen.  Happened to me.
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Offline carnuck

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Re: Hopping rear tire
« Reply #4 on: March 24, 2014, 03:52:57 PM »
Switch the drum to the other side and see if it goes away. If the main leaf is cracked, it WILL hop badly.
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Offline mudkicker715

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Re: Hopping rear tire
« Reply #5 on: March 24, 2014, 04:17:33 PM »
Quote from: carnuck on March 24, 2014, 03:52:57 PM
Switch the drum to the other side and see if it goes away. If the main leaf is cracked, it WILL hop badly.

True that about the main leaf.
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Offline 82 amc eagle xchp

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Re: Hopping rear tire
« Reply #6 on: March 25, 2014, 04:27:16 AM »
Ok , I haven't checked the wheel cyls for years . I have replaced one hard line. I will check it out and get some new wheel cyls and change them out. The spring doesn't look cracked . I babied the car since I had it . Just trying to get ready for summer season . Thanks for the  advice
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