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Author Topic: Horrible vibration from rear when braking  (Read 3369 times)

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Offline pikeagle86

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Horrible vibration from rear when braking
« on: August 20, 2012, 10:01:37 PM »
I bought this 86 eagle sedan a little while back and when I was looking it over before purchase I noticed that the brake line for the rear reservoir on the master cylinder was cut. When I got the car home I replaced the brake line and bled out the brakes and adjusted the shoes which were way out of adjustment. All of the brake components looked new, wheel cylinders, shoes, drums and hardware. Now the brakes are working but I have a horrible vibration that shakes the whole car when I am stopping from high speeds. I adjusted the shoes to where there was light contact when the wheel was rotated. I am wondering if I adjusted the shoes too tight and warped the drum, or if there is something else that I am just not thinking of. I won't be able to pull the wheels until Friday so I am trying to get a game plan going. Once again I want to thank everyone in advance.
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Offline TheWraith

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Re: Horrible vibration from rear when braking
« Reply #1 on: August 21, 2012, 07:19:06 AM »
X2 on what Casper suggested.

Also, ensure the PO didn't put both short shoes on one side and both longs on the other.  I'm still learning about the Eagle, so I'm assuming here that the drum brakes are like all others I've seen thus far in life.
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Offline eaglebeek

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Re: Horrible vibration from rear when braking
« Reply #2 on: August 21, 2012, 04:38:34 PM »
Quote from: TheWraith on August 21, 2012, 07:19:06 AM
X2 on what Casper suggested.

Also, ensure the PO didn't put both short shoes on one side and both longs on the other.  I'm still learning about the Eagle, so I'm assuming here that the drum brakes are like all others I've seen thus far in life.
They are. Not much point in re-inventing the wheel ;D :eagle:
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Re: Horrible vibration from rear when braking
« Reply #3 on: August 22, 2012, 02:29:00 AM »
Maybe the adjustment of the brake shoes it to tight. Brake drum will run hot on spots and give the samen feeling when braking.

Anjo
Holland
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Offline captspillane

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Re: Horrible vibration from rear when braking
« Reply #4 on: August 22, 2012, 07:38:42 AM »
I once had the brake shoe adjuster swapped from side to side. The rear brakes kept locking up and getting very tight as I drove it. I took the drum off and loosened the adjuster several times. It was a temporary fix and a month of driving would make the problem come back. I eventually figured out I had them mixed up.

I'm pretty sure the Driver's side is normal "Righty-tighty Lefty Loosy" threads and the Passenger side is unusual "Righty-loosy Lefty-tighty" threads.
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Offline carnuck

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Re: Horrible vibration from rear when braking
« Reply #5 on: August 23, 2012, 09:44:57 PM »
Usually when backwards they will need manual adjusting quite often.
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Offline pikeagle86

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Re: Horrible vibration from rear when braking
« Reply #6 on: August 26, 2012, 12:05:28 PM »
I had some hotspots on the drums, had the drums machined and everything is smooth now. I checked to make sure that everything was installed properly and it was, Thanks for all the good advice.
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Offline Whuntmore

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Re: Horrible vibration from rear when braking
« Reply #7 on: August 26, 2012, 01:33:43 PM »
I have the same issue and pretty much all my components are new (except the lines and rotors)

check drums (were they machined, or just slapped on?), rear shoes placement (longer one facing rear) check rotors.  Make sure that all components inside the rear brakes are correct.  Check everything.

If all that is good, and solid, AND correct, then you can start looking at other things like bent rims, issue tires, bent axles, etc.
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