Strange Vibration/grinding when Driving

[steelo25]

It seems that of the last few days that my 4.0L petrol has developed a bit of a dry grinding type of vibration when moving, especially at a constant speed. Anyone have any idea's please, it's not the brakes as soon as you touch them it stops then starts again when you take your foot off. It seems to be at city speeds more than highway speeds.
Need help with this as am in the middle of travelling around Australia at the moment towing a van, in south west WA at the moment.
Would low oil in transfer box cause this?
Thanks

[skipperau]

Lots of potential reasons, yes, low oil in the T/C, front or rear diffs could give you noises like that but the fact that the noise stops as soon as you touch the brakes and starts again when you release them suggests that it is the brakes. Loose calipers or pad flutter could cause that grinding sound. How much pad do you have left?


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[steelo25]

They need replacing soon as have done over 15000k's towing our van with current pads, I also put drilled & slotted disc's on the front when pads were reasonably new. I have also noted a bit of, don't know what you'd call it but a "brake surging" when using the brakes at lights & such. Not at highway speeds just when slowing down slowly.
Thanks

[skipperau]

Originally Posted by steelo25

They need replacing soon as have done over 15000k's towing our van with current pads, I also put drilled & slotted disc's on the front when pads were reasonably new. I have also noted a bit of, don't know what you'd call it but a "brake surging" when using the brakes at lights & such. Not at highway speeds just when slowing down slowly.

Thanks

Describe this “brake surging “ a bit?

Doug.


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[Grippy]

Mine had this grinding type issue, turned out being the pinion bearing in the front diff.
Take out your front driveshaft and see if noise disappears, could also be a joint on the front shaft as they grind a bit once they've shit themselves

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[bodgie]

Check the obvious like wheel bearings and balljoints. I'd expect you'll feel some play in both.

Jason

[steelo25]

Originally Posted by skipperau

Describe this “brake surging “ a bit?

Doug.


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Pulling up at lights slowly it'll grab then soften a bit repeatedly, not all the time though. It stopped doing this when I put the new disc's in about 15000k's ago & have only noticed it whilst in Perth and traffic lights.