Rusty Rear Brake Discs

Wheels, Tyres, Suspension, Chassis
Rubik
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Rusty Rear Brake Discs

Post by Rubik » Thu Sep 29, 2016 9:10 pm

My rear discs have been rusty from new. The front discs are smooth and shiny. My Citroen garage don't seem concerned and say it all boils down to braking efficiency.

Now the car has gone in for its 18,000 mile service and the agent says the back wheel brake discs are rusty and I need to drive the car faster and brake more to prevent the rusting up problem. I have never heard such crap. They are asking me to exceed speed limits and brake at the last minute, i.e. use the brakes more. I tend to stick to speed limits, judge the road ahead, lift my foot off the accelerator when approaching hazards and then brake to stop.

Has anyone else got his problem... Rusty rear brake discs??? :?:


FrankBullitt
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Re: Rusty Rear Brake Discs

Post by FrankBullitt » Thu Sep 29, 2016 9:44 pm

This is the same issue owners with A2 1.6FSi and TDI 90's have, namely under-used rear discs due to the lack of effort they provide - unfortunately it means you will never likely replace rear discs and pads for wear, more likely for corrosion.


Angus
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Re: Rusty Rear Brake Discs

Post by Angus » Thu Sep 29, 2016 11:52 pm

Had a 1973 GS Club with all round disc brakes. Seized calipers due to lack of use of the rear brakes was a regular problem.
White / Black Cactus Puretech 110 S/S, Pano, Rear Camera, Black wheels.


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BristolRich
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Re: Rusty Rear Brake Discs

Post by BristolRich » Fri Sep 30, 2016 7:34 am

Personally I'd be taking it to another dealer for second opinion.

Regardless of how much "use" the brakes see in normal daily life, any use should be enough to clear any surface corrosion. Braking efficiency isn't regulated by load or frequency of vehicle use - a press of the pedal compresses the equivalent amount of hydraulic fluid every time and hence the same amount of movement on the caliper.

You can just make out the rear discs in this pic...two years use with an empty boot and probably used once or twice a year with 4 up, otherwise 2 or one.

IMG_3847.JPG

You shouldn't need to break any speed limits as a few emergency stops should clear the surface it other wise I'd be suspecting a seized caliper(s). Either that or its standing for long periods without use.
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Cactus4us
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Re: Rusty Rear Brake Discs

Post by Cactus4us » Fri Sep 30, 2016 4:15 pm

Can't see if my rear drums are rusty or not :lol: :lol:
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Peyote
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Re: Rusty Rear Brake Discs

Post by Peyote » Mon Oct 03, 2016 9:05 am

Chances are the rear brakes are load sensitive. Fill up the boot with lots of heavy stuff and go for a spin round the block, should get them working and hence clean them up.
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Matressontheside
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Re: Rusty Rear Brake Discs

Post by Matressontheside » Thu Oct 06, 2016 12:14 pm

I have corrosion on my drums. It is cosmetic, but I know it is there and did check and it is excluded from the warranty. Any heavy breaking isn't going to help as the weight will transfer to front, lift the rear and the ABS will (I assume) reduce the breaking force in rear. You could try (gently) applying the handbrake when on the move, I expect that will apply rear brake only and give them a polish.
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Crowbar
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Re: Rusty Rear Brake Discs

Post by Crowbar » Fri Oct 07, 2016 3:20 pm

I've been told gently applying the brakes after going in reverse is the best to get the rear discs shiny again. By applying the brakes very gently, the disk makes a couple of rotations before the car is stopped. Worked great on my 207 so far.


Rubik
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Re: Rusty Rear Brake Discs

Post by Rubik » Sun Oct 09, 2016 6:54 pm

BristolRich wrote:Personally I'd be taking it to another dealer for second opinion.

Regardless of how much "use" the brakes see in normal daily life, any use should be enough to clear any surface corrosion. Braking efficiency isn't regulated by load or frequency of vehicle use - a press of the pedal compresses the equivalent amount of hydraulic fluid every time and hence the same amount of movement on the caliper.

You can just make out the rear discs in this pic...two years use with an empty boot and probably used once or twice a year with 4 up, otherwise 2 or one.
IMG_3847.JPG
You shouldn't need to break any speed limits as a few emergency stops should clear the surface it other wise I'd be suspecting a seized caliper(s). Either that or its standing for long periods without use.
The Cactus is driven every day covering about 250 miles a week so it doesn't stand around idle. I am thinking of drawing a line across the disc with permanent marker and just see how much is rubbing off.

I freewheeled down a long hill at 50+mph and just used the brakes to slow down. The front discs were boiling, the rear discs were touch warm, not even hot. Interestingly one comment saying they could be load sensitive? No idea but worth investigating. "Matressontheside" suggesting gentle use of the handbrake, I have already tried this. The discs got very hot but no significant rust removal but Citroen agent didn't approve of the handbrake technique. I think I am going to take the car into another garage and stick it on a rolling road to check their efficiency versus peddle pressure. As someone said, I am more likely going to be replacing because of corrosion before disc/pad wear.


geoffus
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Re: Rusty Rear Brake Discs

Post by geoffus » Sun Oct 09, 2016 7:47 pm

Interesting. I have driven 15000 miles in my Cactus since December 2014, so not a high mileage car. Just checked the rear discs and they are shiny not rusty.
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