ND Brake Discs

  1. My model of MX-5 is: 2017 rf
  2. I’m based near: South Wales
  3. I’m looking for technical help or recommendations on: Rear Discs and Pads

Hi,

Wondering if anyone has any advice, I have owned my car since Oct 2020 and done about 23k miles in that time.

Thanks
Carwyn

Well first off, have the brakes been serviced properly?
You’ve had the disc’s and pads changed by who?

It looks like you have sticking calipers or slide pins, they definitely do not look like the are working correctly. You should have clean discs on properly working brakes, those look like they’ve either not been used for a while hence the rust or sticking.

BTW rear brakes should last an age, much longer than the fronts, less braking force put on them.

1 Like

Hi, it went to the deal the first time and a 3rd party the second time. The first time they were replaced it had a new drivers side caliper as well.

The car only gets driven once or twice a week and lives outside. The attached pictures are after driving about 30 miles.

Does it also live near the sea? Salty sea air blowing on them?

The rear discs get less brake effort,
so the pads wipe them less hard,
so they are more susceptible to rust from moisture blowing in.

After a fortnight parked in Gatwick carpark one winter the rear disc rust was bad enough I eventually needed to skim them. The fronts cleaned off on the drive home.

Here’s a summary

The drivers side looks the worst of the pair. I think the passenger side would clean off with more use. Sometimes the inner facing side of the disc can be worse , check that too.
I had similar with one of my daily drivers discs at the rear, an odd wear pattern, I replaced the set. I think due to little use they started rusting more and more causing pitting, they were 8 years old too with just 32k miles on. Still were very serviceable but as said rust/pitted at the edges.

Yeah, last time it was the inner face that was bad.

Will probably have to make an appointment at the dealer again to see if it is a stuck caliper again…

I’ve heard these (link) are a decent independent if you are close enough for advice.