Brake Disc Thickness

Muncher · 21 Jan 2006 at 16:18

I'm really struggling to find the thickness at which my brake discs should be replaced.

The Vauxhall TIS CD says: Max 26mm Min 24.9mm.

However, there is some confusion as to whether these values were actually incorrectly copied from the Elise details, which were themselves reproduced incorrectly for 5 years!

I am more inclined to think they are actually 25mm from standard, as most of the aftermarket discs seem to be. One set of aftermarket discs say they should be replaced at 23mm another set 21mm (which sounds a LOT of wear).

No one seems to know the correct answer to this, the discs are the same as standard Vectra ones.

The thicknesses of mine are:

23.24mm front, 23.60mm rear

Muncher · 21 Jan 2006 at 16:45

That's not an accurate measure though and doesn't tell you anything more that how much they have worn, not how much they have left to go.

They have done 36.6k, though I know some people who have got onto their third set of disks at 13k!

Muncher · 21 Jan 2006 at 16:54

moss said:
I work in a motorfactors,

Quinton Hazel say: Thickness 25, Min 22
Brakeworld (budget brand but fairly decent): Thickness 25, Min 23
Mintex: Thickness 25, Min 21
AMK: Thickness 25, Min 23
Brake Engineering: Thickness 25, Min 22
APEC: Thickness 25, Min 21

And yeah, the discs are the same as a Vectra B 2.0 - 2.6

Excellent thanks, I don't suppose you can provide prices for them?

Muncher · 21 Jan 2006 at 17:25

Excellent, are they all standard vented or drilled/grooved?

Muncher · 21 Jan 2006 at 18:09

Front and rear are the same. They are 288mm. The TIS CD covers the Vectra but I suspect it will say the same thing.

Muncher · 21 Jan 2006 at 18:44

Oracle said:
Yer, They are standard Vaux discs throughout a lot of their range, MK4 Astra range had these fitted to SRi models up front as well as the Vectra as you say. If the vectra ones say the same, then its unlikely that the values were incorrectly copied isn't it?

Excellent, I have just checked the TIS CD for the Vectra B. There is a lot more info there than for the VX.

It states for the 2.5 (and other larger engined) Vectras the minimum value is 22mm.

No need to change mine just yet, will do it on the next change of pads though.