Brake chirp/win on accelerating

ZoranTerzic · 04-25-2021, 04:19 AM

Hey guys,
Picked up my 440 LCI coupe a month ago and notified the infamous brake chirp.
It happens with the handbrake applied while hopping in and out of the car. And after getting some heat in the brakes, they chirp on takeoff with no brake applied.

Turns out my rear rotor is scored and only fix is to change the whole set. I still have 15,000miles before they need replacing.

Any one else get this or how to prevent in future?

Cheers

cfm56d7b · 05-21-2021, 07:23 PM

Can you provide more information? Will be helpful to know ..

- Did you buy the car new or used?
- What's the mileage now?
- If used, is there a record of previous brake maintenance (rotors, pads)?
- Are the pads OEM or aftermarket? Some ceramic pads tend to score rotors because the brake pad compound is harsher

ZoranTerzic · 06-03-2021, 07:55 AM

Quote:

Originally Posted by cfm56d7b

Can you provide more information? Will be helpful to know ..

- Did you buy the car new or used?
- What's the mileage now?
- If used, is there a record of previous brake maintenance (rotors, pads)?
- Are the pads OEM or aftermarket? Some ceramic pads tend to score rotors because the brake pad compound is harsher

I've purchased the vehicle 2nd hand with 25,000kms on the clock. I've had the car for a few months now.

OEM brakes and never been changed

Currently have 33,000kms on the clock.

2017 model 440i LCI

Billfitz · 07-02-2021, 08:45 AM

A scored rotor doesn't necessarily chirp. Improperly/inadequately lubricated brakes, including the parking brake, will. If your brakes haven't been re-greased since the car was new that's the likely source of the chirp. As for the remaining pad life, that's pure guesswork by the iDrive, as the car has no method to measure the actual pad thickness. That's done visually on all 8 pads as what should be part of a yearly maintenance routine, along with re-greasing the brake metal to metal contact points.

04-25-2021, 04:19 AM	#1
ZoranTerzic Private First Class 141 Rep 139 Posts Drives: f32 435i Join Date: Jul 2017 Location: Sydney NSW iTrader: (0)	Hey guys, Picked up my 440 LCI coupe a month ago and notified the infamous brake chirp. It happens with the handbrake applied while hopping in and out of the car. And after getting some heat in the brakes, they chirp on takeoff with no brake applied. Turns out my rear rotor is scored and only fix is to change the whole set. I still have 15,000miles before they need replacing. Any one else get this or how to prevent in future? Cheers
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05-21-2021, 07:23 PM	#2
cfm56d7b Lieutenant General 5876 Rep 10,249 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	Can you provide more information? Will be helpful to know .. - Did you buy the car new or used? - What's the mileage now? - If used, is there a record of previous brake maintenance (rotors, pads)? - Are the pads OEM or aftermarket? Some ceramic pads tend to score rotors because the brake pad compound is harsher
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07-02-2021, 08:45 AM	#4
Billfitz Lieutenant General 8216 Rep 16,054 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	A scored rotor doesn't necessarily chirp. Improperly/inadequately lubricated brakes, including the parking brake, will. If your brakes haven't been re-greased since the car was new that's the likely source of the chirp. As for the remaining pad life, that's pure guesswork by the iDrive, as the car has no method to measure the actual pad thickness. That's done visually on all 8 pads as what should be part of a yearly maintenance routine, along with re-greasing the brake metal to metal contact points.
	Appreciate 0 Quote