Need advice on a brake issue

[turnbaugh]

I am hoping someone can give me some ideas.

When hard braking from 80-0, everything works fine if the front wheels are perfectly straight .

If the wheeels are even slightly turned or you are going down a hill, there is a terrible shudder and rumbling sound. It still stops well, but there is obviously a problem brewing.

Has anyone seen this before?

Bearings?

I read the post in the "warped rotors". A few hard stops don't seem to change anything.

Dean

[V6GTO]

Ball joint?

Martin.

[turnbaugh]

Ah, yes I forgot to mention, the car has 2300 miles on it.

[paulcundy]

Loose wheel bearing/hub. Take off the wheel, check the nut on the outside of the hub.
Regards
PauL C

[joust]

Yep.

Although check the wheel nuts as well. I have been known to have the same issue and it turned out to be a loose wheel nut

Wheel nuts should be 130Nm
The main bearing inside the wheel that holds the hub carrier on needs to be 270Nm - and as Paul says, they are known to come loose.

A good trick with the wheel bearing nut is to put a bit of red paint across the nut and hub when you have checked them - it's then dead easy to see if the nut has loosened off.

J

[chillidog]

joust said:

Wheel nuts should be 130Nm

... or 110 lb foot in units I can understand
--
Richard

[silversix]

joust said:

The main bearing inside the wheel that holds the hub carrier on needs to be 270Nm - and as Paul says, they are known to come loose. J

Big torque wrench time then...

Think that you might notice lose wheel nuts in a straight line though. At least I did when a well known tyre fitting company didn't put mine back on properly about 10 years ago. When i stopped to look why "something didn't feel right" ALL of the wheel bolts were lose.

[V6GTO]

joust said:

A good trick with the wheel bearing nut is to put a bit of red paint across the nut and hub when you have checked them

Isn't blue or yellow, or turquoise even, strong enough?

Martin.

[turnbaugh]

Thanks Guys, I'll give it a try. I did have to tighten the nuts on the rear wheels. They were very loose, I could take them off by hand.

I presume you are referring to the front wheels now? I feel the shudder in the steering wheel.

[JLSELAN]

... or 110 lb foot in units I can understand
--
Richard[/quote]

Sorry, the correct conversion to English units is closer to 96 lb-ft. As an aside, given the size of the stud and nut, I think this torque setting is excessive. I use 80 lb-ft., and I have never seen any evidence of the wheel nuts backing off either during track sessions (where I check before each session) or for road use where I check once a month.

>> Edited by JLSELAN on Wednesday 25th May 02:33

>> Edited by JLSELAN on Wednesday 25th May 02:44

[chillidog]

I've just asked the factory directly and they say that the correct settings are 120Nm.

This converts to 88.5 lb ft according to www.boltscience.com/pages/convert.htm - don't blame me or the factory if the conversion to imperial units is wrong

So the *definitive* answer is 120 Nm which is what I'll be using from now on!
--
Richard

[joust]

88.5074579lb ft to be precise.

You can ask Google to do it for you....

www.google.co.uk/search?hl=en&rls=GGLD,GGLD:2005-17,GGLD:en&q=120%20newton%20meters%20in%20pound%20foot&spell-1

J

[Mr Noble]

ALL RISE FOR KING "JUSTIN GOOGLE" THE FIRST