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wheelman21

Shake and Shutter

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So my boxster has two issues at speed. The first is a shake right in the seat of your pants, but I believe that to be the result of an obviously bent rim (**** NY roads), but that is soon to be fixed. Issue 2, is a shake/ shudder in the wheel. It happens at 72mph and then at 78, if I take her up to 80-85 no issues, the shake goes away. The tires have barely any miles on them. Any thoughts on what this very very annoying shake is?

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So my boxster has two issues at speed. The first is a shake right in the seat of your pants, but I believe that to be the result of an obviously bent rim (**** NY roads), but that is soon to be fixed. Issue 2, is a shake/ shudder in the wheel. It happens at 72mph and then at 78, if I take her up to 80-85 no issues, the shake goes away. The tires have barely any miles on them. Any thoughts on what this very very annoying shake is?

Either disc run out or wheel balance

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What on earth is disc run out?

Basically wobble at the outside edge of the rotor caused by a bad rotor or wheel hub.

Any way to tell which one without going out buying parts and hoping it solves the problem?

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Lateral runout of the brake disc, max. -- 0.03 mm

Lateral runout of the wheel hub, max. -- 0.03 mm

Lateral runout of the brake disc when installed, max. -- 0.06 mm

You will need a dial gauge and a mount.

post-1-1220567113_thumb.png

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Lateral runout of the brake disc, max. -- 0.03 mm

Lateral runout of the wheel hub, max. -- 0.03 mm

Lateral runout of the brake disc when installed, max. -- 0.06 mm

You will need a dial gauge and a mount.

post-1-1220567113_thumb.png

and have the wheels rebalanced when you check the discs. ;)

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You can also check for disc run out by driving the car to a good speed then applying the brakes - disc run out will induce a wobble felt through the steering wheel, when you release the brakes it will significantly reduce

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