Brake wobble

[Tineca]

Hi, had my 61 r design for a good couple of years now. When I first got it I had the wishbones changed as it snatched to one side when braking. It was much better but then had a light wobble through the steering wheel when braking. Eventually I changed the front discs and the wobble disappeared. It's now come back. All the wishbone bushes are perfect so I'm thinking something is warping the discs. The discs look like new still but it's hard to check for run out. I'm thinking of changing the calipers and discs (again). The symptoms are that it brakes normally and in a straight line but feel vibration through the steering wheel and a definite wobble. It's fine otherwise and no issues with balancing at motorway suppers etc. It's done 150k. Any thoughts most helpful. Thanks Jed

[Tannaton]

A common issues on the Mk1 XC90 often caused by :

- Keeping your foot on the brake when stationary at junctions after slowing from speed (rather than selecting P or N taking foot off).

- Poor quality aftermarket parts

- Lack of regular use and brake disc corrosion, even if minor

I'd get the discs skimmed and see if it happens again. If you have a friendly local garage, the wobble should show up on the brake rollers if it's the discs.

This may help - https://apecautomotive.co.uk/techmat...ntative-steps/

[Tineca]

Thanks. It gets regular use but Im always holding the brake pedal at the lights. I might try top quality discs and see how I go. And use P😀

[Clan]

Originally Posted by jed dunne

Thanks. It gets regular use but Im always holding the brake pedal at the lights. I might try top quality discs and see how I go. And use P😀

that will be volvo discs then .. also clean the mating surface on the hub with a wire brush before fitting and always torque all 5 wheel bolts up to 140 nm .
The later was the main cause of brake vibration on the XC90 .

[Tineca]

Thanks Clan. Will ask Rufe for discs

[Harley Dave]

I got mine (discs and pads) from Caffyns (on eBay) they had a good offer on at the time.

Cheers

Dave

[Tannaton]

Another interesting vid...

https://www.youtube.com/watch?v=B3JUPt4upxk

Disc Thickness Variation (DTV) can be caused by sitting with your foot on the brake at junctions and minor corrosion - we normally expect minor corrosion to naturally come off with use but where there is no or less corrosion behind the pad surface, this causes uneven wear.

For whatever reason, the 2.2t Mk1 XC90 is susceptible to both of the above.