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Shahpor, I never disconnected the Battery doing front or rear brakes, when working on the rear ones I jut made sure the hand brake is released and that I have something under my front wheels to prevent the car rolling over. I am not saying this is right the way I did but it worked, so the garage you phoned just tried to justify higher price they charge.

As @Britprius says any machine shop will do it for £50! 

When I couldn't fix this judder issue I was so upset with the brakes, especially after coming BMW 5 series, that I was looking for another car and not a hybrid. After the brakes were fixed it was a different story, I am still not fully impressed with the brakes but not due to judder but due to it being a hybrid and the way brakes designed to work!

So, do not let your brake saga go for too long, get it done before you get disappointed in the car!  

Good luck Shahpor.

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On 7/29/2020 at 12:18 AM, Barry14UK said:

Certainly holding the brakes on whilst stationary if car has just previously had the brakes strongly applied can cause pad material to transfer to the discs.

Indeed.

I'd recommend trying to get an even transfer. Do 6 lots of hard braking from 50 mph to 10 mph one quickly after the other so the brakes don't cool between each run. The only difficulty is finding a quite bit of road to do it on.

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4 hours ago, Vlady said:

Shahpor, I never disconnected the battery doing front or rear brakes, when working on the rear ones I jut made sure the hand brake is released and that I have something under my front wheels to prevent the car rolling over. I am not saying this is right the way I did but it worked, so the garage you phoned just tried to justify higher price they charge.

As @Britprius says any machine shop will do it for £50! 

When I couldn't fix this judder issue I was so upset with the brakes, especially after coming BMW 5 series, that I was looking for another car and not a hybrid. After the brakes were fixed it was a different story, I am still not fully impressed with the brakes but not due to judder but due to it being a hybrid and the way brakes designed to work!

So, do not let your brake saga go for too long, get it done before you get disappointed in the car!  

Good luck Shahpor.

Thanks Vlad, I very much appreciate it.

I will admit feeling a bit disappointed at first and questioning whether to move on car wise, but in the end, for the moment I haven't given up hope and will look at getting something done about it.

If I could afford the time off, I would consider removing the brakes myself and taking just the discs to get skimmed, but I have just started a new job and the pressure is on, so that is not an option for now.  It does sound like it is going to be an ongoing issue though...

23 minutes ago, ColinBarber said:

Indeed.

I'd recommend trying to get an even transfer. Do 6 lots of hard braking from 50 mph to 10 mph one quickly after the other so the brakes don't cool between each run. The only difficulty is finding a quite bit of road to do it on.

Sorry, perhaps I am being dense, but do you mean try this now to potentially get rid of the warping?

Thanks.

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Incidentally, I have now received the video from the investigation that shows the run out of the disc at 0.2-0.3mm against a specification maximum of 0.05mm.

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14 hours ago, Shahpor said:

Incidentally, I have now received the video from the investigation that shows the run out of the disc at 0.2-0.3mm against a specification maximum of 0.05mm.

Does it men that they are worn?

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No, it is the different in height between the low and high spots on the disc's surface.

The technical term is actually Disc Variation Thickness (DVT) so the number specified relates to the difference in disc thickness, which in my case is 0.2-0.3mm.

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Run out is the amount of 'wobble' as the disc rotates. It can be caused by DVT but it could also be that the disc is not sitting true on the hub. If the latter, that can cause the former.

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Quite right John, it should be noted, like you say, that Run Out can involve a few factors, one of which might be DVT.

In fact, I was told that the Lexus technician did take off my disc and have a look at the hub to make sure it was clean, which apparently it was.

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On 7/30/2020 at 6:05 PM, Shahpor said:

 

Anyway, I tried a local skimming place and they won't do it because it is a hybrid.  He mentioned something about needing to plug it in to a computer to wind the pistons back into the calipers?  Also, they were afraid the pistons would jump out because of the electric accumulator.

 

Not sure if "Premier" models have different brake setup, but replacing the brakes on 2012 "Luxury" easy DIY takes about 2 hours complete with caliper clean and greasing the rear caliper sliding pins. Set of decent quality rotors and pads £250- £300 all in. Pushing back the pistons by hand is easy as pie. 

Hybrid GS is a heavy car and it takes toll on brake system. I wouldn't expect more than 2 years out of front rotors anyway as the rust will do it's job in this climate.  

 

 

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Sadly, my car does have a different brake setup than the Luxury.

There was a thread on here a while ago about the cost.  Basically, all the GS models except the F Sport and Premier have standard 340mm front discs that aren't that expensive, however, the F Sport and Premier have 356mm 'floating' discs that are considerably more expensive.

I agree that removal and refitting of the brakes is a relatively easy DIY job.

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17 hours ago, aviator888 said:

Hybrid GS is a heavy car and it takes toll on brake system. I wouldn't expect more than 2 years out of front rotors anyway as the rust will do it's job in this climate.  

Yes it is a heavy car but it is also a hybrid and hybrids that use charging the traction Battery to slow down are not as heavy on brakes.

John

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On 7/30/2020 at 1:30 PM, royoftherovers said:

Lexus Indie Garages (1).docx Time to consider an Indie Shahpor ? I`ve attached the current list.

Hi John, you do realise the irony in recommending an indie from your list, is that one of the garages is Jemca.
Jemca own Lexus Reading and are in turn wholly owned by no other than Toyota.

I was aware of the issue of warping brakes and the suggested causes as it happened to me with a Lexus 20 years ago. As a result ever since, when I have had to brake heavily I always release when safe, and reapply where necessary to allow the heat to escape. I have not had any further issues, but I find it as puzzling as everyone else, but not had a recurrence and to be fair it is rare I guess that we have to brake severely very often.

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