DS7 Brakes

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Iansel
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Joined: 08 Aug 2019, 14:48
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DS7 Brakes

Post by Iansel »

My rear brake pads and discs are significantly worn according to the garage. Car has only done 22k miles much of it on motorway and still on original tyres.

Apparently the front pads and discs are fine.

Is there a front/rear brake bias adjuster fitted to the DS7 and if so where is it and how do you adjust it?
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GiveMeABreak
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Re: DS7 Brakes

Post by GiveMeABreak »

No, that’s a bit old school. They don’t have anything like that on most modern vehicles. Electronic Brake force distribution and other fancy features are all handled by the ESP ECU to ensure maximum even braking efficiency these days.

That’s not unusual mileage nowadays for discs and pads. I’ve just replaced front pads and discs (badly scored) at 16k miles and the rear discs are 60% worn. Further, the rear discs have huge lips on the edge, so they’re will also need replacing soon.

As the electronic handbrake operates the rear brakes, you have to factor in features such as hill start assist and the like. Pulling away with electronic parking brakes will keep the rear brakes applied until you start to move off and then will release. All this extra holding of the rear brakes may likely be the cause of additional wear not usually associated with rear braking.

The materials used may also be a factor these days - softer materials may lead to more frequent replacement.

I’ve dumped the OEM discs and pads and have had some Brembo replacements instead. Much better quality and a third of the price of dealer branded ones. These are also oiled and treated, which it didn’t look like the OEM ones were as they had rusted right through the centre where they join and well down into the honeycombed part. We shall see how long these fare by comparison.
Iansel
Posts: 68
Joined: 08 Aug 2019, 14:48
x 5

Re: DS7 Brakes

Post by Iansel »

Marc,

Last time I tried to replace pads on a electrically controlled parking brake I couldn't work out how to release them while parked.

How do you do it on the DS7?
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GiveMeABreak
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Re: DS7 Brakes

Post by GiveMeABreak »

Hi Ian, looking at the DS7, these will have electronically operated brake calipers. So there is a motorised unit on each of the rear calipers that acts directly on these. In order to do any maintenance like pads or discs, the rear motorised brake calliper actuator has to be put into the dismantling position using Diagbox.

So it's not an easy job without specialist diagnostic tools unfortunately.