XJ40 ( XJ81 ) 1986 - 1994

Thump on braking 94 XJ12

Thread Tools
 
Search this Thread
 
  #1  
Old 04-20-2023, 07:10 PM
alabbasi's Avatar
Senior Member
Thread Starter
Join Date: Aug 2010
Location: Dallas TX
Posts: 482
Received 97 Likes on 66 Posts
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?
 
  #2  
Old 04-20-2023, 07:52 PM
944play's Avatar
Senior Member
Join Date: Aug 2020
Location: Portland, OR
Posts: 374
Received 218 Likes on 148 Posts
Default

My '95 needed a transmission mount bushing. Symptom was a heavy metallic thunk during ABS-inducing stops.
 
The following users liked this post:
Don B (04-26-2023)
  #3  
Old 04-20-2023, 08:17 PM
alabbasi's Avatar
Senior Member
Thread Starter
Join Date: Aug 2010
Location: Dallas TX
Posts: 482
Received 97 Likes on 66 Posts
Default

Thanks, this one seems like it's coming from the front.
 
  #4  
Old 04-24-2023, 05:14 PM
jerry_hoback's Avatar
Veteran Member
Join Date: May 2007
Location: Indiana
Posts: 3,279
Received 1,164 Likes on 817 Posts
Default

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?
 
The following users liked this post:
Don B (04-26-2023)
  #5  
Old 04-24-2023, 05:15 PM
alabbasi's Avatar
Senior Member
Thread Starter
Join Date: Aug 2010
Location: Dallas TX
Posts: 482
Received 97 Likes on 66 Posts
Default

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
 
  #6  
Old 04-26-2023, 08:30 AM
Join Date: Feb 2014
Location: Crossroads of America
Posts: 19,669
Received 13,424 Likes on 6,622 Posts
Default

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; 08-14-2023 at 12:35 PM.
The following 3 users liked this post by Don B:
944play (04-26-2023), Bill Mac (04-26-2023), Lawrence (04-26-2023)
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mtotrainer
XJ XJ12 ( X305 )
2
05-17-2022 06:10 PM
SteveJacks
XK8 / XKR ( X100 )
11
01-11-2015 11:42 AM
marshgrp
Wheels / Tires, Suspension & handling
1
08-01-2011 03:42 AM
catwithahat
XK8 / XKR ( X100 )
1
12-05-2009 05:28 AM
JSJAG
XJ XJ8 / XJR ( X308 )
1
10-09-2009 03:13 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


Quick Reply: Thump on braking 94 XJ12



All times are GMT -5. The time now is 07:29 PM.