Squealing brakes and reverse speed

[Deeps]

Hi, I'm having trouble with squeeling brakes when reversing out of my drive. The speed it reverses is excessive for the limited observation I have, and I need to reverse due to the charger positioning. I have to control its backward movement using the brakes with no throttle. That's when the squeeling starts. Does the reverse speed seem excessive or should it just crawl backwards.

 

[Jomarkh]

I have this with my MG5.
As the brakes are not used much, surface rust develops quickly and when I reverse out of my drive with slight use of the brake it makes an awful noise.
If you jump on the brakes now and again it cleans them up.

 

[Ian Key]

Hi, I'm having trouble with squealing brakes when reversing out of my drive. The speed it reverses is excessive for the limited observation I have, and I need to reverse due to the charger positioning. I have to control its backward movement using the brakes with no throttle. That's when the squealing starts. Does the reverse speed seem excessive or should it just crawl backwards.

It's normal to control the reversing speed with the brakes in an automatic including EVs. The brake squealing is caused by a bit of rust buildup on the discs.

Once a week on a quiet road brake sharply two or three times or push the brake pedal with your left foot while keeping the accelerator pressed with your right.

 

[Deeps]

Thank you both for your response.I've had the car just over a month. If its rust this quick what does it say about the long term for the cars brake discs. I'll try out what you suggest and see what happens.

 

[Jomarkh]

Thank you both for your response.I've had the car just over a month. If its rust this quick what does it say about the long term for the cars brake discs. I'll try out what you suggest and see what happens.

It is just light surface rust on the disc's.
It would appear on an ICE if not used for a couple of days.

 

[Weeble]

I find the same if I don't drive for a day or two. I put it down to using OPD 90% of the time and the lack of brake usage in practice.

 

[NickHeynes]

It is just light surface rust on the disc's.
It would appear on an ICE if not used for a couple of days.

Yeah , look at cars parked in long stay carparks in the winter !

 

[T1 Terry]

Hi, I'm having trouble with squeeling brakes when reversing out of my drive. The speed it reverses is excessive for the limited observation I have, and I need to reverse due to the charger positioning. I have to control its backward movement using the brakes with no throttle. That's when the squeeling starts. Does the reverse speed seem excessive or should it just crawl backwards.

If it troubles you to the point you are concerned about neighbour complaints, is you chamfer the trailing edge of the brake pads, this noise will go away. The squeal is a very rapid vibration of the pad against the disc, caused by the now leading edge when in reverse, catching on the disc and then releasing. The chamfer moves this leading edge closer to the pressure apply area of the pad and the vibration stops .... This normally trailing edge becomes the thicker end of a wedge shape because the other edge is the one that meets the disc first in normal direction rotation. In reverse, that edge meets the disc before the other edge of the pad and that leaves enough space for the ringing squeal to be produced.

It's a pain that this sort of thing has to be done on a new car, but when a technician replaces brake pads, they do this chamfering as part of the fitting routine for this very reason.

T1 Terry

 

[Alb]

I used to get this on my MG5 but I've never experienced it with the MGS5.