Corroded (rear) discs

[PeteC]

If it's an EV press the accelerator and brake at the same time whilst driving and brakes will be applied not regen just keep accelerating . Or do an emergency stop your brakes will activate. Not regen .

I did this before my third service and first MoT. I guess it must have worked as I had been told about having rusty brakes at the second service but they didn't get a mention this time.

 

[Rom]

What about using Snow mode? Does that use minimal to no regen?

 

[Scotsman]

What about using Snow mode? Does that use minimal to no regen?

Snow mode still uses regen albeit not as much , it's all about not relying on regen to bring you to a halt use the brake pedal so that the brakes will stay pretty rust free.

 

[LenEV2016]

Volkswagen got round the issue with using old tech on the rear brakes, they switched back to drum brakes

 

[salty]

Yep, it's hard to believe, but apparently the ID7 uses rear drums. S'pose they know what they are doing..

 

[Scotsman]

Volkswagen got round the issue with using old tech on the rear brakes, they switched back to drum brakes

Yep and the Flintstones got round it with a couple of holes in the floor yabba dabba doo

 

[salty]

Yep and the Flintstones got round it with a couple of holes in the floor yabba dabba doo

Brilliant!

 

[Alb]

Said holes were also the propulsion system!

 

[Scotsman]

Said holes were also the propulsion system!

Yep and it worked mind you my feet were covered in blisters.Christ IAM showing my age now :Wilma

 

[LenEV2016]

Yep and the Flintstones got round it with a couple of holes in the floor yabba dabba doo

Work fine though and no need to worry about corroded discs

 

[Scotsman]

Work fine though and no need to worry about corroded discs

Yep didn't have a problem with long toe nails either

 

[salty]

Yep and the Flintstones got round it with a couple of holes in the floor yabba dabba doo

Yep and it worked mind you my feet were covered in blisters.Christ IAM showing my age now :Wilma

Yep didn't have a problem with long toe nails either

Your on form, this morning.

 

[Scotsman]

Your on form, this morning.

Yeh Sunday is my good day ,it's all downhill from here

 

[siteguru]

Volkswagen got round the issue with using old tech on the rear brakes, they switched back to drum brakes

For an EV, drum brakes on the rear (assuming rear wheel drive - the axle upon which the motor is mounted is the one that'll do regen) make sense as they don't get used much in normal driving.

 

[decrep]

If it's an EV press the accelerator and brake at the same time whilst driving and brakes will be applied not regen

I tried this on my MG4, and it definitely DOESN't happen this way.
Keeping a steady pressure on the accelerator with right foot, and a +ve power meter, any pressure on the brake pedal with left foot, instantly turns the power meter to -ve numbers!

 

[MSvirus]

My Xpower had its rear brake discs and pads done the fall of 2025, on MG guarantee. They rusted since day one, only on the outside of the brake disc, and only on the outer half of the disc. The inner part against the hub has always been perfect. It is clearly visible that the pads is not contacting the brake disc correctly. Three days after the brake disc and pad change, the same rust pattern was on the disc again. Did the "put ut to speed - push into N - brake really hard", several times, and it was a bit better, for some days again. Needed this treatment several times a week. Could not keep ut with that, so it is rusted again. Probably so bad it can't be braked off at all. This is not a usual level of braking, this is track levels of braking needed to keep them clear. Looked at the rear brake discs of two other Xpowers my friends have, and they are exactly the same. Conclusion: The rear brake caliper is not correctly made, there is a design flaw with how it makes the pads contact the brake disc. In over a month, with only normal driving without hard braking, my IM6 has perfect rear discs.

 

[Sparky2]

If you are a mature, considerate driver, you can drive for miles and miles in an MG4 without needing to touch the brakes. Up here in the Pennines, this would soon lead to terminal corrosion of the discs. However, as a mature and considerate former racing driver, I try to brake very hard a few times each week, especially on the day before a service and MOT test. I put a couple of heavy bags in the boot (trunk), take the car up to around 60mph on a straight, dry (if you are lucky) road, check your mirrors and brake hard with care. Repeat a few times and you will find this cleans up the discs front and rear and should prevent the dealer from trying to sell you new discs and pads before they are worn out. Braking gently won't clean the rear discs due to the regen system. Extra weight in the boot will force the rear brakes to operate normally under heavy braking. Heavy rear seat passengers also work but they may not enjoy the hard braking. Go steady and check your mirrors before hard braking

 

[CarlThom]

If you are a mature, considerate driver, you can drive for miles and miles in an MG4 without needing to touch the brakes. Up here in the Pennines, this would soon lead to terminal corrosion of the discs. However, as a mature and considerate former racing driver, I try to brake very hard a few times each week, especially on the day before a service and MOT test. I put a couple of heavy bags in the boot (trunk), take the car up to around 60mph on a straight, dry (if you are lucky) road, check your mirrors and brake hard with care. Repeat a few times and you will find this cleans up the discs front and rear and should prevent the dealer from trying to sell you new discs and pads before they are worn out. Braking gently won't clean the rear discs due to the regen system. Extra weight in the boot will force the rear brakes to operate normally under heavy braking. Heavy rear seat passengers also work but they may not enjoy the hard braking. Go steady and check your mirrors before hard braking

Just use the brakes !!!!!

 

[LenEV2016]

It's not the first time that some of the corroded discs issues have been due to the pads not applying the pressure evenly across the surface of the disc

 

[T1 Terry]

If you are a mature, considerate driver, you can drive for miles and miles in an MG4 without needing to touch the brakes. Up here in the Pennines, this would soon lead to terminal corrosion of the discs. However, as a mature and considerate former racing driver, I try to brake very hard a few times each week, especially on the day before a service and MOT test. I put a couple of heavy bags in the boot (trunk), take the car up to around 60mph on a straight, dry (if you are lucky) road, check your mirrors and brake hard with care. Repeat a few times and you will find this cleans up the discs front and rear and should prevent the dealer from trying to sell you new discs and pads before they are worn out. Braking gently won't clean the rear discs due to the regen system. Extra weight in the boot will force the rear brakes to operate normally under heavy braking. Heavy rear seat passengers also work but they may not enjoy the hard braking. Go steady and check your mirrors before hard braking

An alternative is to have a family member that drives like my wife ..... no hope of rust building up on the discs and oxidised rubber on tyres that could hinder traction ..... not sure if fingernail gouges in the dash and excessive wear on the panic handle are safety related things, in South Australia, we don't have vehicle inspection each yr, they wait in ambush to pounce on any vehicle that looks sus ... or modified .... and go through it like a dose of salts .....

T1 Terry