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Heavy brake vibration

831 views 1 reply 0 participants last post by  Michael Pardee 
G
#1 ·
While this is my first post to the group I'd like to start by saying a very
gracious thank you for all I've learned while lurking the past few years

I have a 1993 940 ABS/no turbo that is demonstrating some very powerful
vibrations while braking. This happens when the brakes heat up and it gets
worse the more I use them

I installed new calipers and rotors (4) last summer - They calipers were
rebuilt/loaded and have provided excellent service over the past year. The
rotors were of high quality and the wheels have always torqued on.

In the process of troubleshooting, I've checked bushings, shocks and
driveshaft center bearing-- I pulled the front wheels over the weekend and
found one seized caliper. At worst, that same problem with the rear brakes
would be great

I wonder if any of you have experienced anything similar or have an idea of
what else it might be -

Thanks

JM
 
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G
#2 ·
"JohnM" <jm@athehouse.org> wrote in message
news:yB3ne.130231$CV1.43385@fe02.news.easynews.com...
> While this is my first post to the group I'd like to start by saying a
> very gracious thank you for all I've learned while lurking the past few
> years
>
> I have a 1993 940 ABS/no turbo that is demonstrating some very powerful
> vibrations while braking. This happens when the brakes heat up and it
> gets worse the more I use them
>
> I installed new calipers and rotors (4) last summer - They calipers were
> rebuilt/loaded and have provided excellent service over the past year. The
> rotors were of high quality and the wheels have always torqued on.
>
> In the process of troubleshooting, I've checked bushings, shocks and
> driveshaft center bearing-- I pulled the front wheels over the weekend
> and found one seized caliper. At worst, that same problem with the rear
> brakes would be great
>
> I wonder if any of you have experienced anything similar or have an idea
> of what else it might be -
>
> Thanks
>
> JM
>

I have had a similar problem with our '85 765T when a tie rod was failing.
The boot had torn and the lubrication was lost. The shaking was noticable
with light brake application but became violent with moderate braking. When
I changed the tie rod I was amazed to find the play was only a mm or so. It
was detectable by jacking the wheel up and trying to turn it side to side
(like steering). I could feel the play, and watching the tie rod and
steering column (alternately) I could see the tie rod was moving when the
steering column was not.

Mike
 
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