Rx400H Brake Discs - Do They Need Replacing?

[rudders]

My dealer is suggesting that my brake discs will need replacing when I next have the pads renewed.

I'm not convinced - there is no scoring, nor rust.

What are the criteria for determining whether the discs need replacing? Do I need a micrometer?

[PCthug]

My dealer is suggesting that my brake discs will need replacing when I next have the pads renewed.

I'm not convinced - there is no scoring, nor rust.

What are the criteria for determining whether the discs need replacing? Do I need a micrometer?

brake pads can last many miles/years before they need replacing, so by the time yours are ready for new ones who knows what state your discs are gonna be in.

The may be fine or may be heavily worn.

You dont need a micrometer, you can usually visually inspect them quite easily.

The most common thing is that they wear where the pads had made contact, leaving a prominant 'lip' on the outer edge. This can result in the brakes binding and squeeling at all times. Some places will even grind this lip down for a fraction of the price of new discs.

They can also corrode on the face of them too (not to be confused with surface rust, as this is not a problem). The corrosion will look like the pads haven't been making contact in areas of the disc, and the disc will be quite 'pitted'.

If your really unlucky, then brake discs can also crack.

It will take MANY miles (or faulty binding pads or dodgy driving) for them to wear down to the point of being too thin.

[ihpj]

I would be inclined to ask your Dealer to measure the discs in front of you and then show you what the Lexus suggested replacement thickness is :)

That way you can be assured you are getting good advice.

[Mac Spurs]

Anyone noticed when braking at low speeds, the brakes "slip" for a split second just after engaging and then engaging properly after?

if so, any ideas why?

[acabucca]

anyone had theirs replaced (front)

Mine will need doing shortly and Lexus price was astronomical compared to a couple of local places.

Any suggestions as to where people have had theres done (if a national chain), or even if it's worth paying for say brembo?

Cheers

[vadre]

Anyone noticed when braking at low speeds, the brakes "slip" for a split second just after engaging and then engaging properly after?

if so, any ideas why?

Yes I have noticed this recently. I believe it has been covered on this forum previously, and is caused by the re-generative braking system.

Nothing to worry about apparantly, though I intend to raise the subject with my dealer at my next service.