Quote:
Originally Posted by sandbagger
Right Front caliper has been ordered  wouldnt retract
I hope this was the source of the 57-62mph vibration but I doubt it.
Front bearings and CVs are only about 15K miles old, Driveshaft/mid bearing new not even 6K ago so I am guessing its rear wheel bearings?
Had to pull the Z4 out of winter storage a few weeks earlier than I wanted |
Stuck caliper can for sure cause shimmy if the rotor is not perfectly square. It can also cut a rotor in half. My son and nephew both had this happen last year.
Do you have a shimmy thread going? If not, start one so we can track it down.
There's a simple test to find loose suspension as culprit:
1) when going about 50 mph 80kmh, gently slow down like 5mph with constant brake pressure. If you get a shimmy from this over 90% chance it's from the sideways control arms behind the front axle.
2) drive about 60-65 mph on the center of a highway (on the center lines of two-lane or center of three lane highway). (the point is to be on the top of the crown). Now holding the steering with thumb and one finger, ever so gently steer back and forth past center. You're testing for if the wheels will wobble as they flip from being held left to right and vice versa.
The only time the sideways control arms not the cause from those two it was the steering rack.
Ball joint and tension strut do not usually cause a shimmy.
You can get a shimmy from alignment having too little toe in but that will cause tramlining or wandering before shimmy.
–awr–
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