XJ40 ( XJ81 ) 1986 - 1994

Thump on braking 94 XJ12

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Old Apr 20, 2023 | 07:10 PM
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Default Thump on braking 94 XJ12

So I get a loud thump on braking at times when I apply the brakes hard. Shocks or bushings?
 
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Old Apr 20, 2023 | 07:52 PM
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My '95 needed a transmission mount bushing. Symptom was a heavy metallic thunk during ABS-inducing stops.
 
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Old Apr 20, 2023 | 08:17 PM
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Thanks, this one seems like it's coming from the front.
 
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Old Apr 24, 2023 | 05:14 PM
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If it only happens on braking , then it's not likely the shocks although those bushings are a known "weak point" Maybe pull the front wheels and have a good wiggle on the calipers? Perhaps they are sticking on the slides?
 
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Old Apr 24, 2023 | 05:15 PM
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Jerry, thanks. I'm being super lazy as my lift is tied up but I'll try to get the wheels off this week. I was wondering if it was a control arm moving or something along that line. It happens on hard backing and does make quite a bang, as if something shifted
 
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Old Apr 26, 2023 | 08:30 AM
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Hi alabassi,

There are many possible suspects for your thump: control arm bushings, ball joints, subframe Vee mounts and rear pivot bushings, wheel bearings, shock bushings, brake caliper guide pins and bracket mounting bolts, transmission mount (that noise usually comes from under your seat), rusted body mounting points, etc. It could be a serious safety issue, so you're going to have to take a good look at everything.

Cheers,

Don
 

Last edited by Don B; Aug 14, 2023 at 12:35 PM.
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