Farqui

Hey Mark, well done with the front bumper swap - a subtle change but quite a number of parts were involved.

Looks smart 

Cheers, Lee

What is the coolant level on the hybrid cooling reservoir ?

Has the hybrid coolant been changed recently ?

Any coolant leaks ?

After a few miles my ears have now stopped hearing the tyre drone and I'm firmly enjoying the silent waft again  

Isn't it weird how you gradually get familiar with something and then when it suddenly stops, it sounds/feels so odd.

Smooth, round tyres for the win! 

For reference Rockauto, Autodoc, etc have the GS hub assemblies listed cheaper than OEM.

Yes, vehicles in that price range are getting older now so will more than likely have a few faults.  

The trick is finding one that's right for you and your wallet.

Good luck.

John, fair point for a sold hub where the bearing is pressed out/in but the GS comes as a sub assembly with ABS sensor/etc that's then mounted to the upright.

Although these sub assemblies are meant to be replaced as a whole, I can image that it could well be dissembled and just the bearing replaced.

In that year range there are 13 listed on Autotrader - do none of those float your boat?

Do you want a specific colour, trim, mileage. etc?

Keep looking, there aren't many around but one will pop up.

As for price, that's pretty much set by the market, spec's, condition and what prices folks are willing to pay.

Good luck in your quest.

FYI: as it turns out my wheel bearings were okay but LexusPartsDirect have kindly added mk3 GS450h front bearing prices to their website (thanks Daniel). 

They may help a fellow owner out...

https://www.lexuspartsdirect.co.uk/parts/lexus-gs/lexus-gs-phase-iii-2005-2012/lexus-gs-2005-2012-brakes-transmission/lexus-gs-phase-3-o-s-front-wheel-bearing/

https://www.lexuspartsdirect.co.uk/parts/lexus-gs/lexus-gs-phase-iii-2005-2012/lexus-gs-2005-2012-brakes-transmission/lexus-gs-phase-3-n-s-front-wheel-bearing/

Hi Mark, that's quite an estimate on disks/pads all round and 2 tyres, I suggest that you shop around. 

Or maybe even DIY the disks/pads, if you're able?

Do you know how old the disks are?  Are they badly corroded/pitted and do they have a lip at the outer edge?

If the steering wobbles under braking that that's a good indicator that there's an issue up front.  

If you feel vibrations through just the seat then that's a fair suggestion there's an issue at the rear.

Worn suspension can also contribute to brake wobble.

Good news John, well done.  A relatively easy change with positive results, nice.  Would be interesting to see the results of a 4 wheel alignment on your car.

That reminds me, these old front tyres have been steadily loosing pressure since day#1 so I've been pretty much checking/adding air every couple of weeks.

Low psi is another possible contributor to feathering.

The lads seated these new tyres really well so I hope I don't have to continue with that 'ritual'.

Well done  and fingers crossed that it's a long term fix.

Did you source a used pump in the end?

Update: over the past several thousand miles we've noticed an increasing wheel bearing type of noise that seems to come from the OSF.  None of the wheels showed any signs of movement and I've also tried to feel/listen at the hubs for any signs of wheel bearing failure but didn't find anything conclusive.

Checking replacement wheel bearings and the prices motivated me to take another look!

So yesterday I popped the front wheels off and closely inspected the tyres, rims, etc. 

I didn't see any bulges, wobbles or out of roundness but running my hand back'n'forth along the rotation of the tyre...the outer 1/4 had quite severe feathering/cupping  

These were the original tyres the vehicle came with (2.5 years+) and further up this thread you'll see that we corrected severe alignment issues approximately 10 months ago.  So I'm hoping this odd wear was due to that bad tracking issue (toe) that's been resolved and not tired bushes, dampers, etc. 

'Googling' for feathering/cupping it seems that cheap tyres often suffer issue this more, so that's another possibility as I'd never heard of the brand.  I think Camber can be ruled out as the issue was on the outside of the tyre, altho this may point to a caster problem.

Anyhoo, I swapped the front wheels left/right and took a good drive to a tyre shop but didn't notice any difference in the noise  which was now bloomin' annoying 

The tyre guy reckon the feathering was really bad and he wasn't at all surprised the noise sounded like a bad wheel bearing.

After fitting two new front tyres and the drive home was transformed, being soooo much quieter and the ride felt softer too 

Unfortunately I reckon the rears are also showing sighs of feathering/cupping  or I'm now being overly cautious!  Thinking back to last years geometry woes...I had new tyres fitted a few weeks earlier so they may have suffered a bit of scrub before realignment.  I do hope it's not another issue with the set-up/etc. 

I've never had this on any other vehicle, so are GS's prone to feathering tyres? - discuss please...

Urgh, tracing water leaks can be a pain so i hope you get some good tips.

Checking the sunroof drains is a good start, have you tried easing back the footwell carpet and pouring water over the the (closed!) sunroof and checking for any water running in? The drain seals/boots can tear or become dislodged.

Has the windscreen every been replaced? If badly fitted, they can be known to leak.

Good luck tracking this down.

Those rear calipers are amusingly small vs the front big guns up front...but as you say, the rear don't work much with the regen braking taking much of the work.

Painting the calipers is well worth doing tho as the OEM finish is

Well done Andrew, looking good and should clean up easier now too.

I'm impressed that you did a thorough strip down of the wheel spokes too 

Ashley@AshGS450h, now that you had your new Battery for a few weeks...has your mpg changed much?

It's still running okay i presume?

Hey Zak I'm glad that the IS is restoring your faith in reliable motoring, long may that continue.

Do you have have any pic's to share, we like pic's 

I was pleased that you had a direction to follow.

I just hope that the dealer has a good reason and isn't asking you to play 'parts darts'.

I reckon I'd start by first checking the filter in the tank, ensuring the pickup and pipework is okay tickety boo.

Good luck anyhoo's.

I'd be tempted at that price especially as they're an easy part to replace.

I reckon you'd have to be prepared to change them after a few years tho, depending on your annual usage.

Well done, it's good to know that such issues/niggles/annoyances can be resolved with a little motivation 

Some of these options aren't available to tweak from the vehicles menus, a Techstream or dealer should be able to set which option you require.

Great news Julian @lexusbeef, what's the spec/colour combo and do you have any pic's to share?

Tis a fine 'sleeper' you just have to try to keep a hold of your licence

Yup, all in one and soaking wet...

Well that is good news, that the filter is just under the rear seat.