MG ZS EV Brake discs

[a6taxipl]

Just over 4400 miles and getting grinding noise from rear brakes (low speed braking).
So photos of all 4. Clearly 2 fronts are smoother than rears. How's yours looks like?

 

[Gomev]

We have brakes as well ?

 

[BillyWhizz]

the rear disks look scored check to make sure that no stone chippings or other foreign objects found their way between the disks and the pads

 

[Kithmo]

Mine actually looked like that from new but they seem to look better now.

 

[Cocijo]

Take it round the Nurburgring that’ll sort them out!

 

[Mark Holmes]

the rear disks look scored check to make sure that no stone chippings or other foreign objects found their way between the disks and the pads

Could have been the road salt and grit from the bad weather...

 

[Lovemyev]

Rear brake disc scale / rust, is a direct result of our good old friend "Max Re-gen".
The rear brakes get very little usage due to Re-gen and therefore rust / scale builds up quickly.
I think it is very likely that rear disc's could get replaced prematurely due to scale and rust build up and NOT down to wear / scoring from the brake pads.
In wear terms only, I could see a set of rear pads lasting the life of the car !.

 

[Cocijo]

Is it not just a case of every now and then giving you can a run and applying the brakes a bit forcefully a few times to get rid of surface crud?

 

[Jaygee]

From the photos does not look like a lot of wear. Likely to be scoring. Something caught between the pad and disc. Increased use of brakes should get rid of that.
I have the same problem with my hybrid. Have to get them cleaned out every year.
Don’t be tempted to (unless you know what you are doing) to clean this out yourself. Brake dust gets everywhere. One place you definitely don’t want it is in your lungs.

 

[Cocijo]

Yes - EV brakes get nowhere near the use and subsequent wear of those on an ICE car. The rear brakes even less than the fronts. Far less brake dust and much cleaner wheels! The negative side is they can seize up if used very lightly and in salty/adverse conditions. Most cars will need the brake pads taking out and a general clean and light grease of certain (no not the face of the pads!) mating surfaces before reassembly. The linings and discs will usually last a long time - the biggest issue being disc corrosion due to lack of use - although this is partially true for any car that is not used much.

 

[Kithmo]

Does regen work in "R" ?
Just thinking maybe you could clean light rust off by reversing then braking.

 

[a6taxipl]

Take it round the Nurburgring that’ll sort them out!

From the photos does not look like a lot of wear. Likely to be scoring. Something caught between the pad and disc. Increased use of brakes should get rid of that.
I have the same problem with my hybrid. Have to get them cleaned out every year.
Don’t be tempted to (unless you know what you are doing) to clean this out yourself. Brake dust gets everywhere. One place you definitely don’t want it is in your lungs.

Noone recommended WD40 yet lol

 

[Lovemyev]

Noone recommended WD40 yet lol

 

[JodyS21]

I've noticed the rear brakes (electronic handbrake) is a bit "sticky" sometimes in the mornings, can feel it ping/release when I start reversing off drive sometimes.

 

[Lovemyev]

I've noticed the rear brakes (electronic handbrake) is a bit "sticky" sometimes in the mornings, can feel it ping/release when I start reversing off drive sometimes.

Same here !.
My previous PHEV did the he same thing.
If I wash the car and use a mild alloy wheel cleaner, then rinse off with clean water, then leave overnight.
The handbrake can release with a heavy “Clunk”.
If I run the car around the block and apply the foot brake a few times, before parking up for the night.
The following morning, the handbrake will release more easily and with no “Clunk”.

 

[Cocijo]

Yes i get the same thing.

 

[JodyS21]

Just checked my brake disks. Done 1500miles now since got 6 weeks ago.
The rear brake disks definitely look scored - one side has 3 or 4 "groves" all the way around!

I know they're not used much, but blimey that's not good.

 

[Cocijo]

Just checked my brake disks. Done 1500miles now since got 6 weeks ago.
The rear brake disks definitely look scored - one side has 3 or 4 "groves" all the way around!

I know they're not used much, but blimey that's not good.

I wouldn’t worry too much as all discs gets scored. As long as they are not badly scored, worn or corroded. The effective area that the brake pads operate on is not really impacted by light scoring. the odd stone will always get stuck in there and score the disc. The worst enemy on EV’s is lack of use and seizing/rust. It is worth now and then giving the brakes a bit of a work out if your normal driving means that they get very light usage. Nothing too severe. As i previously mentioned it is also worth popping the brake pads out every couple of years and having a general clean up and regrease, depending on use and road conditions.

 

[Cocijo]

Disc

 

[Kithmo]

Disc

Disc is correct for a a flat, thin circular object. Disk is computer speak as in floppy disk.