11-19-2018, 11:40 AM | #1 |
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Brake Job
So my front pads are pretty good, very meaty. There is a small lip on the caliper but I don't have any braking issues.
The problem is that my rear pads are basically gone and I just got the brake system notification to change my pads. There is also a small lip on the rears. How damaging would it be to just put the pads on? Should I play it safe and replace the rotors as well?
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11-19-2018, 11:48 AM | #2 |
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Take the car to the dealer and have them measure the rotor thickness. They won't replace them until they reach a minimum thickness under the maintenance warranty and will just throw on pads if the rotors don't meet minimum thickness requirements.
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11-19-2018, 11:49 AM | #3 |
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I don't have a maintenance warranty and plan on doing it myself. I have the pads and rotors on order but I'm trying to see if it's possible to cheap out. If I measure the rotor and it's above the minimum thickness, do they need to be resurfaced or should I just slap the pads on and call it a day?
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11-19-2018, 11:51 AM | #4 | |
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11-19-2018, 11:53 AM | #5 |
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Would they resurface them or no?
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11-19-2018, 12:34 PM | #6 |
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resurfacing would additionally reduce the thickness of the rotor thus rendering them due to be changed as well.
Get some aggressive pads and it will even out the edges or "lip". Also, look into a maintenance plan. If you're under 50K miles, you can scoop up a two year plan for around 1,700$. Oil, brake pads + rotors + fluid, and a couple other fluids are all covered. Last edited by Lmaiuri; 11-19-2018 at 01:34 PM.. |
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11-20-2018, 10:38 AM | #7 | |
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11-21-2018, 11:13 AM | #8 | |
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11-22-2018, 11:29 AM | #9 |
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You need to measure the physical thickness of the swept area of the rear rotors.
BMW allows for 1.6mm of wear over the lifetime of a rotor before its reached minimum spec. If you are close to the minimum just replace them, don't be cheap. They start out at 24mm new, so anything less than 22.4mm and they are done. Don't forget to also order and install a new sensor, and keep in mind you'll need ISTA to set the rear calipers to service position retracting the parking brake mechanism. $1500 for a dealer using Genuine parts to carry out a rear brake service on a F10 M5 is 100% reasonable. I would not expect a independent to be much cheaper as there is no cheap aftermarket option for these cars available to cut costs. Zimmerman is not OE. Genuine BMW is OE. |
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11-22-2018, 12:59 PM | #10 | |
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Last edited by M5Rick; 11-22-2018 at 01:09 PM.. Reason: Addition. |
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11-22-2018, 01:31 PM | #11 |
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I have zero experience handling the carbon discs so I cannot comment there.
Regarding the standard rotors I have had Genuine BMW and Zimmerman side by side on many different BMW M cars with the aluminum bell / floating design. The Zimmerman and Genuine bell casting is not the same when compared side by side. Same story with the disc portion as well when critically compared side by side. The differences are more than simply grinding off the BMW emblem and tossing it in a Zimmerman box as is otherwise common in the auto parts industry. That said of course either one is going to be fit for use, I'm just making a point that Zimmerman is most definitely not Original Equipment. |
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11-23-2018, 07:39 AM | #12 | |
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11-23-2018, 09:36 PM | #13 | |
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11-25-2018, 11:23 PM | #14 | |
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Is there a way to do the rears without ISTA? Does this video not apply because it's an M5?
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11-26-2018, 04:46 PM | #15 |
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Well I’ve got everything torn down because the parts are all arriving tomorrow and the parking brake assembly looks identical to the one in the video. I haven’t tried to release the parking brake with the torx bit yet. Just wondering if there is anything I’m missing.
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11-26-2018, 05:58 PM | #17 |
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They are coming in tomorrow. I have everything broken now so that it'll only take 20 minutes when the parts come in.
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11-27-2018, 09:24 PM | #18 |
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I just wanted to post a quick update. The rear caliper seal on the driver side was brittle and as soon as I tried to compress it, it ripped requiring replacement. The specific part for the rear caliper piston seal is here https://www.ecstuning.com/b-genuine-...l/34206786064/
Much cheaper than replacing the whole caliper. The BMW part # is 34206786064 I tried to find this seal everywhere, but nobody has it listed specific to our vehicles. I used realoem and cross referenced the part numbers.
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Last edited by SuperF10; 11-27-2018 at 09:31 PM.. |
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11-29-2018, 07:30 PM | #19 |
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I wanted to add that this caliper seal is not as easy to get on as a regular caliper seal. It has parts inside for the EMF actuator which for reference goes flat washer, spin washer, flat washer and then inside of the hole on the inside of the caliper there is a rubber o-ring. If you’ve gotten this far you need to borrow someone. Using your thumbs pull the seal open and have someone wiggle the caliper piston in. Spin until it matches the grooves of the EMF parts and then press. Ta-da it’s all rebuilt. Sorry for no pictures, this was a pain in the butt figuring out how to do everything because there isn’t much info online. Best of luck if you have to do this repair. PM me if you have questions.
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