brake experts...100 series landcruiser

Submitted: Monday, Apr 11, 2005 at 14:26
ThreadID: 21957 Views:2446 Replies:4 FollowUps:9
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when braking I have steering wheel wobble.....i know er guess something is wrong with rotors...but what is it and how does it ocurr?
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Reply By: Leroy - Monday, Apr 11, 2005 at 15:07

Monday, Apr 11, 2005 at 15:07
Warped rotors probably due to overheating. They need to be machined/skimmed/replaced if they are too thin.

Leroy
AnswerID: 106155

Follow Up By: Nudenut - Monday, Apr 11, 2005 at 15:40

Monday, Apr 11, 2005 at 15:40
They have been machined once.
any ideas why it keeps happening?...
even though its an auto, i dont ride the brake...i only use one foot.

and, I dont think i brake excessively.
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FollowupID: 363208

Follow Up By: Leroy - Monday, Apr 11, 2005 at 15:52

Monday, Apr 11, 2005 at 15:52
Once in how many km's?
Usually autos are a lot harder on brakes and especially offroad. I had problems with my VT crumbledoore front rotors and were machined twice before 20k. I then have had no problems since and the cars at 150k! I had probs with the rears but put it down to excessive heat due to lots of driving through the mountains and have had them machined twice also and replaced the rotors at the 80k mark. No probs for some time.
I don't think I brake excessively either but I think you'd be surprised how much heat is generate winding down a mountain pass for example.

Leroy
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Follow Up By: Nudenut - Monday, Apr 11, 2005 at 16:13

Monday, Apr 11, 2005 at 16:13
now 120k
if i recall i think i had them done at around 60-70k....but i have not had this problem with 3 x 80 series or 2 commodores or ford ltd, mazda bravo...just this 100 series yr 2000
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FollowupID: 363211

Follow Up By: BenSpoon - Monday, Apr 11, 2005 at 17:01

Monday, Apr 11, 2005 at 17:01
Ill jump on that bandwagon too. We had several company vehicles that were all exactly the same year/model. One developed a very noticeable wobble under brakes around 15k. Rotors were skimmed, and the problem went away. Not one other of the 20 other identical vehicles did this.
Are your brake vents clogged with mud? Maybe hosing it down after a long drive back thru stop-go lights with the vents clogged..?
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FollowupID: 363215

Follow Up By: Nudenut - Monday, Apr 11, 2005 at 18:33

Monday, Apr 11, 2005 at 18:33
I will check the vent holes...but when machined last time they didnt mention that they were even partially blocked...but i will check to be sure
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FollowupID: 363231

Follow Up By: 80scruiser - Monday, Apr 11, 2005 at 20:38

Monday, Apr 11, 2005 at 20:38
Discs very rarely warp. Its called DTV. Disc thickness variation and it happens if the wheel bearings aren't adjusted right or if in the case of slip off rotors such as commodores they aren't cleaned correctly prior to fitting. Thats the rotor and the hub. Run out should be measured with a dial indicator after fitting as DTV can't be measured with a dial indicator only a micrometer in 8 different places on the rotor. Try this site here Very interesting reading.

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FollowupID: 363254

Reply By: Penguin (NSW) - Monday, Apr 11, 2005 at 16:13

Monday, Apr 11, 2005 at 16:13
Rotors can also warp by hitting a substantial puddle. The cooling effect can be enough to warp them.

Mike
AnswerID: 106167

Follow Up By: Nudenut - Monday, Apr 11, 2005 at 18:35

Monday, Apr 11, 2005 at 18:35
if that were the case most cars would suffer from it ..wouldnt they?
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Follow Up By: Nudenut - Monday, Apr 11, 2005 at 18:36

Monday, Apr 11, 2005 at 18:36
to clarify.... most vehicles regardless of make
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Reply By: Members - Greg & Gail - Monday, Apr 11, 2005 at 20:19

Monday, Apr 11, 2005 at 20:19
If you can feel the wobble in the brake pedal check the wheel bearing nuts are tight
Greg
"Work interferes with living"

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AnswerID: 106227

Reply By: Outnabout David (SA) - Monday, Apr 11, 2005 at 20:53

Monday, Apr 11, 2005 at 20:53
Hi Nudie,

They can warp from a variety of reasons, riding brakes or heavy applications down steep hills such as at the end of both our freeways, coming down ackland hill road at coro valley, anywhere that they are likeley to overheat. Also creek crossings if the rotors are hot.

Sometimes the matching of rotors and pad material can have an effect. Ie some after market pads can be very hard on rotors. Try to get pads that match as near as possible to OE.
AnswerID: 106233

Follow Up By: Outnabout David (SA) - Monday, Apr 11, 2005 at 20:58

Monday, Apr 11, 2005 at 20:58
Also could be calipers sticking slightly causing overheating.
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