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Rear discs rust
#1
Hi everyone. I noticed a rubbing noise from my rear passenger side brake and then noticed both rear discs have quite a lot of rust on them. The car didn't get used much between December last year and March so i'm guessing the rust is due to that with all the rain we had. It's only done 3k miles in total too. From what i've read, rusty rotors wouldn't be covered under warranty

Now back at work and driving each day i've tried braking hard when safe to clear the rust but it seems pretty well stuck on. I tried a wire brush which did nothing. 

Is there anything I can do? Or worth changing the rotors myself? I would drive with the hand brake on slightly but it's an electronic brake.
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#2
You only have two options:

1) sporty driving for a while
2) disc/pad replacement

I have the same issue with my family SUV. It significantly affects braking quality, jerking and pulsating.
2021 130hp 1.5 BlueHDi EAT8 L2 XTR Gris Platinum
ex: 2003 1.4i cargo
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#3
No expert here but.......

The rear discs will probably not clean themselves up if the vehicle is not loaded. I would try adding some weight in the rear and driving normally for a while, the load sensor should increase the use of the rear brakes.

You may need to change the pads quite soon after though but cheaper and easier than discs.

The Citroen GS was awful at doing this, also my VW T4 has rear discs which do the same when it's parked over the winter.
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#4
Performance seems fine.

How much weight do you think I need in the back? I have about 50kg of discs i can put in a box in the boot.
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#5
(05-05-2021, 11:38 AM)mjsmke Wrote:  Performance seems fine.

How much weight do you think I need in the back? I have about 50kg of discs i can put in a box in the boot.

That would be a start but I'd be tempted to pile in a few bags of sand or shingle, as near the rear door as possible. Obviously don't go bonkers but the car is quite able to take a fair weight and I would want to see a bit of depression on the rear suspension.
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#6
Make sure they won't go flying in case of an emergency.
2021 130hp 1.5 BlueHDi EAT8 L2 XTR Gris Platinum
ex: 2003 1.4i cargo
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#7
Just realised I need some big bags of bark chips for the garden so I'll put 4 bags in the boot for a few days and see if it helps. Probably safer than weights too.
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#8
try driving about 20mph and pull on the handbrake gently until the h/brake warning comes on then release , or reverse hard and brake , that make the rear brakes work
2010 B9 red XTR w a v. 
2001 1.9d DW8B white  Berlingo  
2005 2.l green Berlingo
2001 1.9d DW8B white  Berlingo 
berlingo 1.4 red multispace
1993 xud 1.9 red partner
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#9
(05-05-2021, 03:10 PM)brodfather11 Wrote:  try driving about 20mph and pull on the handbrake gently until the h/brake warning comes on then release , or reverse hard and brake , that make the rear brakes work

Not going to work with electric parking brake.
2021 130hp 1.5 BlueHDi EAT8 L2 XTR Gris Platinum
ex: 2003 1.4i cargo
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#10
(05-05-2021, 04:22 PM)boop Wrote:  
(05-05-2021, 03:10 PM)brodfather11 Wrote:  try driving about 20mph and pull on the handbrake gently until the h/brake warning comes on then release , or reverse hard and brake , that make the rear brakes work

Not going to work with electric parking brake.

Is it that different from my K9. I can apply the electric handbrake at low speed and it is certainly very efficient and would clean the discs with a few applications.

Geoff
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