Gs Discs

[Mike246]

My GS has done 77k and is about to get its fourth set of front discs. The present set have lasted 17k before warping.

This is not on. Most of the mileage is motorway and I am not heavy on the brakes. Lexus Hatfield say that one disc pair replacement with every other pad change is the norm.

Never had to replace disks on the six Hondas I have owned, two of which went over the 100k.

Just recovering from spending £ 500 replacing the front bearings.

Not fashionable on this forum to knock Lexus, but this is not on.

[Monster-Mat]

Automatics use discs and pads more frequently...........

and if as you say you do more motorway driving, that would indicate more time in traffic jams or stop start journeys, which means you hold the car on the brake more frequently, creating Hot spots and pad material transfer to the disc surface, thereby causing your "warped discs".

technically there is no such thing as warped discs.its pad material transfer to the disc surface

[Mike246]

Thanks for the response but that doesn't seem right.

The motorway driving is in lieu of town driving. Far less stop-start journeys over the life of the discs.

I examined the last set that came off my GS. No pad material on them - that would be easy to remove. The discs were not worn down but there was run-in (warp) over the radial area.

I think one contributing factor is that on the GS, in traffic it is usual to hold the car on the brake pedal as the 'handbrake' is foot-operated. This must keep the front discs hot.

[jdmparts_guru]

I think that you can try to bring your car to an independent service specialist and ask them to have a look at the rotors. Probably it only need some resurfacing.

I have about 30K km on my GS, and do not have any problems. I think that the Lexus hour rate is is relatively expensive, en resurfacing is not a 100% garantuee, so that is why they do not offer this.

In general the brake rotors will outlast 3- 4 sets of pads.

[ColinBarber]

Making sure the wheels nuts are the correct torque will help.

Also you won't always see the pad material on the disc surface.

http://www.stoptech.com/whitepapers/warped_rotors_myth.htm

[Rob]

i had some warped discs, so i put them on the lathe, and clocked them to 0.002mm of run out before i started turning them, removed a small amount of material and it was defo not pad material that was coming off, the disc was warped, skimmed both sides, both sides clocked to 0.002

after about 2 months the discs went again, so the lesson is - once the disc is warped it always will be so put it in the bin!

[ColinBarber]

Maybe you didn't remove enough:

The only fix for extensive uneven deposits involves dismounting the discs and having them Blanchard ground - not expensive, but inconvenient at best. A newly ground disc will require the same sort of bedding in process as a new disc. The trouble with this procedure is that if the grinding does not remove all of the cementite inclusions, as the disc wears the hard cementite will stand proud of the relatively soft disc and the thermal spiral starts over again. Unfortunately, the cementite is invisible to the naked eye.

[Rob]

that is possible. once i had got to a stage where no more material was being removed on a pass, i removed another approx 0.5mm of raw material so a total of 1mm, but u never know!

[mudzs]

When i first got my car the dealer had to change the rear discs as they were warped ,it had only done 29,000 miles at the time .how can rear discs wear out that quick the previous owner must have been driving with the handbrake on .i have had vans that have covered 150,000m and still on there first set of discs and they have been carrying far more weight than any car .I am starting to think lexus have a lot more problems with their cars than most people think it seems that every day someone has a problem that seems to arise again and again ,why have they not adressed these niggles ,and if i was to change the discs on my car i know for sure it would not be with a lexus part

[Rodders_UK]

,and if i was to change the discs on my car i know for sure it would not be with a lexus part

I've tried Lexus, EBC and DBA discs mate - same problems with all of them (sadly)

[jdmparts_guru]

,and if i was to change the discs on my car i know for sure it would not be with a lexus part

I've tried Lexus, EBC and DBA discs mate - same problems with all of them (sadly)

Perhaps you should also try out different makes for the pads...

I heard that especially EBC pads will warp disks easily!

[Rodders_UK]

I've tried Lexus pads and EBC pads. Not a big fan of EBC - less dust but they're very hard IMO

[RX-Men-8]

Hi,

It's not only a matter of how many miles the discs have been on the car. You can probably "warp" the discs on the first few miles out of the showroom if you do it right (wrong ;) ). Just decelerate from high speed a couple of times until the discs are really hot and then come to a complete standstill with the brakes applied. (You don't ever want to try that)

Unfortunately with automatic transmissions this is just what happens very easily. People with a manual gearbox usually let go of the brake at the traffic lights, so it doesn't happen to them as easily.

So, if you have to stop from high speed, let it crawl a bit, don't come to a complete stop or else brakepad material gets transferred or the discs may cool down unevenly creating a warp.

RX-Men-8