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Discussion Starter · #1 ·
My 1999 S70T5 has recently began to exhibit a vibration similar to a warped brake rotor while braking. I replaced the rotors and pads, checked the runout as less than .2mm, but no change in the vibration. When braking to a stop from a slow speed as in my neighborhood approaching a stop sign, you can feel each revolution of the wheels. When braking from highway speeds, the car shudders violently. After the new rotors didn't help, I replaced all 4 engine mounts and the torqure rod. Engine now runs nice and smooth, but still has the exact same problem. Its like a fore to aft motion. I also checked the runout on the wheels.

Has anyone else experienced this?

Thanks,

Marty
 

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Which rotors did you replace?
Where they Volvo parts?
 

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They are genuine Volvo rotors replaced on the front. I checked the rears last night and they measure .001" runout. I then pulled the 50 amp relay to the ABS and drove it. Still no good result. When braking from 50mph, it's like someone is hammering the car. When pulling to a stop sign, its a gradually decreasing motion tied to the wheel revolution.

I have owned 5 volvos over the past 20 years and have always done my own work on all of them. I have never seen anything like this before. I guess I am going to have to bite the bullet, open wallet, and take it to a Volvo specialist$$$.
 

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If the braking would then only be attributable to the rear ones (as in your suggestion) could it then, be the pump for the front?

Just a thought.
 

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Discussion Starter · #5 ·
Problem solved.
I took it to an independant Volvo shop, they replaced the rear rotors, pads, and added some sort of shim. Stops are now as smooth as silk. They called the sympthom "wasboarding". Like driving over a giant washboard. A good description of the problem.

Still doesn't make sense to me, since the rotors did not measure warped. Oh well, I hope someone else can benifit from this finding. The cost of the rotors installed - $391.

Marty
 

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Thanks for sharing!


I am sure many would benefit!
 
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