My car has led a sheltered life, 6000 miles in 3 years, always garaged (internal so its not only dry but temperature doesnt vary much night/day, never below 10 deg as well). Usually only take it out on dry sunny days and avoid taking it out in wet or bad weather. We use the Fabia on rainy, wintry days as well as for short trips. So its at home and in the garage safely tucked up for up to a month at a time, with the parking brake always off.
Despite this Briskoda induced OCD , it appears the rear discs are indeed made out of swiss cheese. In particular the passenger side has become quite pitted on the outside, at last service Skoda reported that the inside face was far worse "mainly in one place where the pad had clamped the disc when parked" Confirmed by their health check video clearly showing it. Hmmm. Disappointed but not unexpected judging by this forums testimony.
The front discs are nice and shiny , as is the rest of the car underneath, the suspension etc.
So, frustrated that nobody here is man enough to try, today I decided to be the forum pioneer/guinea pig and use the EPB as an emergency brake to see what happens.
First, I checked YouTube to see if someone had already tried this and what to expect. Found an american video with a Honda Civic, where the EPB pulls the car sharply up making lots of loud alarming farting/grinding noises. Another was a Topgear video in Golf R (closer to a Superb), no farting/grinding was evident but a sharp pull up.
Handbrake Turn with Electronic Parking Brake
So I set off down our estate, got up to 20mph , onto a straight quiet deserted bit, checked it was safe to proceed, EPB on, loud farting type noise from rear for a fraction of a second and sharp pull up, took no more than 2 seconds. Judging by the way the car squatted, it was rear braked only. Quite dramatic but controlled. Tried again, this time at 30mph, same again, fart and sharp pullup, though the car evidently travelled that bit further and took a bit longer. I tried it a third time, same.
Nor sure what causes the fart, might be ABS, but its quite brief followed by a smooth but sharp deceleration. Be prepared!
Anyway, I can confirm it definitely helps to clean up the rear discs, although my three low speed attempts weren't enough to completely remove the pitting. I can't see the inner face to check that side. Gonna have another go at a faster speed when the car is out again and the mood takes me, but that might be another month.
I will have to take the rear wheels off (for the 1st time) sometime later this year, before they become too welded to the hub. I will check the inner faces then, and if I remember, I'll report back.
So if you're going in for an MOT or a service/upsell attempt, or those discs look like a scrapyard castoff, why not try it yourself, just make sure its safe to do so, straight deserted road, weather/road surface good, and brace for impact!
Definitely don't try it with passengers/pets or half a ton of bricks in the boot.