vibrate while braking.

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crazyasian344@sbcglobal.net - 29 Mar 2007 23:18 GMT

My1994 toyota landcruiser have problem (VIBRATE WHILE BRAKING) before
it happens i changed all four rotors first i thought it was air in the
system i bleed so many times and still the same.Now i don't know what
to do i don't know what cause it. any help will be greatly
appreciated. Thank you.

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Ray O - 29 Mar 2007 23:38 GMT

> My1994 toyota landcruiser have problem (VIBRATE WHILE BRAKING) before
> it happens i changed all four rotors first i thought it was air in the
> system i bleed so many times and still the same.Now i don't know what
> to do i don't know what cause it. any help will be greatly
> appreciated. Thank you.

Measure and record radial and lateral runout on each of the rotors. How
much torque was applied to each lug nut when installing the wheels, and were
the lug nuts tightened in a start pattern on 2 passes?

What is the condition of the tires?

Did the condition exist before you replaced the rotors?

When you replaced the rotors, what was the condition of the caliper slide
pins and sleeves?

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Ray O
(correct punctuation to reply)

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Viperkiller - 30 Mar 2007 05:20 GMT

>> My1994 toyota landcruiser have problem (VIBRATE WHILE BRAKING) before
>> it happens i changed all four rotors first i thought it was air in the
[quoted text clipped - 12 lines]
>When you replaced the rotors, what was the condition of the caliper slide
>pins and sleeves?

How about checking the wheel bearing while you're at it.

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Ray O - 30 Mar 2007 05:39 GMT

>>> My1994 toyota landcruiser have problem (VIBRATE WHILE BRAKING) before
>>> it happens i changed all four rotors first i thought it was air in the
[quoted text clipped - 15 lines]
>
> How about checking the wheel bearing while you're at it.

Yup, that too!

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Ray O
(correct punctuation to reply)

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Jeff Strickland - 30 Mar 2007 02:23 GMT

I installed new rotors on my BMW, and the rotors were not true. I called the
maker of the rotors and they shipped a new set for free that were not true
either. I had them trued (machined to be straight) and installed them. The
trouble was immediately resolved. I then trued the original set and wrapped
them in newspaper after coating them with grease in the hopes of avoiding
rust formation before I need to use them.

Moral of the story is, you can not be sure that rotors are true, and smart
money takes the extra step of having them checked and machined if needed
before they are installed.

In any case, your trouble is not caused by bleeding, or the lack thereof.

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