I have a 96 na, and was wondering when I should change the disks. There is a lip around the edge on both the front and rear, and I don’t know if they have ever been changed. And if they need to be, I can’t find any OE replacements. Any help would be great!
Thanks
Thanks so much, don’t know why I couldn’t find any OE disks, that so helpful. I want to keep the car as stock as possible, so thats great.
Thanks so much for your help, I will get to wrenching.
Your post is a good example of why the idea of an MOT every two years was dropped. The MOT saves more lives than any other traffic legislation IMHO.
You can’t prove a negative of course but I’d bet the house on that being the case….
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“Its a MOT fail if the discs are down to 3mm. But most don’t get it to this state.”
They would be a bit floppy 
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Just to clear up any confusion, here are the limits as prescribed on the gov.uk website for the MOT test.
Apparently if the pad is below 3mm it will be a minor fail so will still pass mot.
To check this with any degree of accuracy get one of these it will not break the bank.
Disc Brake Rotor Thickness Caliper 0-60mm Gauge Micrometer Measuring Tool K4C9 | eBay UK
The following is from the Mazda Workshop Manual
1.6 NA
Front Diameter 235mm
Front New Thickness 18mm
Front Minimum Thickness 16mm
Rear Diameter 230mm
Rear New Thickness 9mm
Rear Minimum Thickness 7mm
1.8 NA
Front Diameter 255mm
Front New Thickness 20mm
Front Minimum Thickness 18mm
Rear Diameter 230mm
Rear New Thickness 9mm
Rear Minimum Thickness 8mm
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