Steering Vibration Conundrum
Discussion
My car has never suffered from steering vibration, but suddenly I have a problem.
The only change I made was to replace the front brake discs, but sadly I dropped off the old discs at the tip before realising I had an issue (so I can't refit them to rule out the new discs).
I have changed everything at the front of the car within the last 12 months, all bushes and thrust washers, and I've just checked all suspension bolts. I found one of the steering rack bolts was loose (tightening it has helped somewhat). I've had all four wheels balanced, but the vibration issue is still present.
It is easily prompted by using the brakes lightly, that sets up a horrible harmonic. But I can still feel a vibration through the steering wheel without braking at about 90mph while coasting out of gear.
I can't believe the new discs can be the culprit, that just seems absurd. But I'm out of ideas so any suggestions are welcome.
The only change I made was to replace the front brake discs, but sadly I dropped off the old discs at the tip before realising I had an issue (so I can't refit them to rule out the new discs).
I have changed everything at the front of the car within the last 12 months, all bushes and thrust washers, and I've just checked all suspension bolts. I found one of the steering rack bolts was loose (tightening it has helped somewhat). I've had all four wheels balanced, but the vibration issue is still present.
It is easily prompted by using the brakes lightly, that sets up a horrible harmonic. But I can still feel a vibration through the steering wheel without braking at about 90mph while coasting out of gear.
I can't believe the new discs can be the culprit, that just seems absurd. But I'm out of ideas so any suggestions are welcome.
robsco said:
Paul, could you perhaps PM where you purchased the discs? I am having the same problem with a set of very recently fitted discs and pads, I have had all other avenues checked and all is well. It didn't vibrate on the old discs.
Actually I can't, the PM link is broken on your profile. Can you PM me instead and I'll email you.taylormj4 said:
I had this after a few 1000 miles with EBC brake discs. I understood that they could harden differently due to uneven heating of the disc. This creates hardenned spots that don't wear at the same rate as the rest of the disc, which then cause high spots that overheat during braking, which worsens things. There was lots on the forums about it at the time.
There is a similar issue highlighted by StopTech, pad deposits causing vibration when braking.http://www.stoptech.com/technical-support/technica...
However this was different - Vibration from new, when coasting not braking, but exacerbating by light braking, and going over bumps.
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