Brake Disc's

**slipperysam1984** · 21st September 2010, 10:23

Hi,
I need to replace the rear brakes on my siggy soon, and i wanted to know how do you know if the disc needs replacing as well.

I don't want to put pads on and find that the disc is screwed.

So do you replace the disc's after so many pad changes?

thanks in advance

Sam

**Big Dave** · 21st September 2010, 10:49

My rear discs were changed at the first pad change as they were quite worn down.

If you buy the parts from Vauxhall then it's cheaper to buy a brake disc/pad kit than it is to buy the discs and pads separately. Can also apply to other sellers as well. Thought I'd mention it in case you bought the pads on their own then discovered later that you also need discs as well.

**Das** · 21st September 2010, 10:52

The discs need replacing if they are very heavily scored and/or rusty. You will know if they are heavily worn by the lip on the edge of the disc caused by the pad wearing the metal of the disc away. There's no set point to replace discs, one look at them should tell you if they are serviceable or not.

**jonnybravo** · 21st September 2010, 20:38

Hi SS
minimum thickness for rear discs (ventilated) 18mm
minimum thickness for rear discs (solid) 10mm

**dcm23251981** · 11th January 2012, 18:51

hi guys had front and rear discs and pads fitted back in august and over the last coupler of days there has been a loud squealing noice from the f o s after inspection there is 2 rings not heavily scored but what can be the problem help ??????

**dcm23251981** · 11th January 2012, 18:54

had new discs and pads fitted back in august and a couple of days ago the front o s started squealing after inspection there is 2 rings in the centre but not heavily scored what could it be help

**John LE** · 12th January 2012, 02:18

Sound's like the common problem of the heatshield behind the disc touching the disc

**DHobbs** · 12th January 2012, 08:35

Originally Posted by dcm23251981

had new discs and pads fitted back in august and a couple of days ago the front o s started squealing after inspection there is 2 rings in the centre but not heavily scored what could it be help

You could have a small stone stuck between the disc and pad. Happened to me on my old golf. Just remove the pad and inspect them.

**DHobbs** · 12th January 2012, 08:38

Originally Posted by slipperysam1984

Hi,
I need to replace the rear brakes on my siggy soon, and i wanted to know how do you know if the disc needs replacing as well.

I don't want to put pads on and find that the disc is screwed.

So do you replace the disc's after so many pad changes?

thanks in advance

Sam

As mentioned above, but also look at the hub part of the disc, it should say the min thickness. Mine are solid and read MIN 10mm.