My front rotors are rusting in the middle

M5_Raz · 08-13-2020, 07:05 PM

Hello guys,

New user here. I'm having a problem with my front rotors where they're rusting in the middle as if the caliper isn't pressing there.

Can someone tell me what the problem might be? I attached a picture as well.

Thanks,
Raz

Boosted M5 · 08-13-2020, 11:02 PM

Rust comes from moisture. Are you having brake issues. I would look to see if your caliper pistons are leaking.

M5_Raz · 08-13-2020, 11:11 PM

Quote:

Originally Posted by Boosted M5

Rust comes from moisture. Are you having brake issues. I would look to see if your caliper pistons are leaking.

Quote:

Originally Posted by Boosted M5

Rust comes from moisture. Are you having brake issues. I would look to see if your caliper pistons are leaking.

No brake issues. I'm gonna take the wheels and calipers off this weekend and try to see what's going on. It's the same on both front wheels.

SapphireM5 · 08-14-2020, 09:37 PM

The brake pads are not making contact on the rotors in those rust bands. Pull caliper and inspect

M5Rick · 08-17-2020, 05:51 AM

Brake pads are making contact alright if it's braking ok, take pads out and replace possible faulty pads with new ones and clean up rust with wire brush finishing of with wire wool if it's not a caliper fluid leak, if it was then you'd have warning and soft pedal.Whats in like on the inner side of disc?..the same or ok??

94jedi · 09-13-2020, 11:36 AM

Quote:

Originally Posted by SapphireM5

The brake pads are not making contact on the rotors in those rust bands. Pull caliper and inspect

agreed, something is up there. the contact patch of the pads is way off.

M5_Raz · 09-15-2020, 10:55 PM

Quote:

Originally Posted by 94jedi

Quote:

Originally Posted by SapphireM5

The brake pads are not making contact on the rotors in those rust bands. Pull caliper and inspect

agreed, something is up there. the contact patch of the pads is way off.

Quick update for future readers. Although a lot of gunk was removed, cleaning did not help much. I took it to a shop and they said everything looked good. They rebedded them and there's no problem anymore.

08-13-2020, 07:05 PM	#1
M5_Raz Lieutenant 514 Rep 538 Posts Drives: BMW M5 Join Date: Aug 2020 Location: Bay Area, California iTrader: (0)	My front rotors are rusting in the middle Hello guys, New user here. I'm having a problem with my front rotors where they're rusting in the middle as if the caliper isn't pressing there. Can someone tell me what the problem might be? I attached a picture as well. Thanks, Raz Attached Images
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08-13-2020, 11:02 PM	#2
Boosted M5 Private First Class 69 Rep 193 Posts Drives: F10 m5 Join Date: Dec 2018 Location: Sf bay area iTrader: (0)	Rust comes from moisture. Are you having brake issues. I would look to see if your caliper pistons are leaking.
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08-14-2020, 09:37 PM	#4
SapphireM5 Major 711 Rep 1,107 Posts Drives: 2013 M5 Sapphire Black Join Date: Feb 2017 Location: New Jersey iTrader: (3)	The brake pads are not making contact on the rotors in those rust bands. Pull caliper and inspect __________________ '13 Black Sapphire Metallic - BPM Stage 1 Tune - RPI Exhaust - KW HAS Kit - 12mm spacers all around- Carbon Fiber front lip - High Kick Trunk Spoiler - Rear Roof Spoiler - IND Kidney and Fender Grills - 20% Tint all around 50% Front Windshield - PPF
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08-17-2020, 05:51 AM	#5
M5Rick General 60014 Rep 19,524 Posts Drives: M5 F10 DCT Gunmetal Join Date: Aug 2018 Location: Southern England iTrader: (0)	Brake pads are making contact alright if it's braking ok, take pads out and replace possible faulty pads with new ones and clean up rust with wire brush finishing of with wire wool if it's not a caliper fluid leak, if it was then you'd have warning and soft pedal.Whats in like on the inner side of disc?..the same or ok??
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