08-09-2020, 03:04 PM | #1 |
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Questions about M Performance Brakes
I've got a 2017 430i convertible with base brakes (312/300 rotors) that I purchased after it was returned from a lease. The rear rotors have been overheated at some point in their life. I'm considering upgrading to the M Performance brakes. My research has generated a few questions:
Summary of completed upgrade: Parts list Pictures Last edited by SD Convert; 12-16-2023 at 11:35 AM.. |
08-09-2020, 04:50 PM | #2 | |
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They fit under 18s. All F3xs can fit them in 370/345. Theres a stamp on the back. Or ask for a part number.
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08-10-2020, 09:28 AM | #3 | |
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08-10-2020, 09:34 PM | #4 | |
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Thanks for reminding me of the casting. That's probably the best way to verify rotor size on used calipers. I've seen that video previously. Good job, but it focuses on the implementation, while I'm currently focusing on parts, preparation and compatibility. |
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09-07-2020, 09:07 PM | #5 |
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Progress.
I picked up drilled Stop Tech 370/30 & 345/24 rotors, Stop Tech SS brake lines and Hawk 5.0 pads. I also found a set of M4 calipers on eBay in near-perfect condition. All of it arrived this past week, and I had time today to verify fit. I've got about 1/4" clearance between the caliper and the rim. Thanks to the post above, I was expecting this, but it's good to see it with my own eyes Now I've got to put together the small parts order. (includes the shields) I should be able to get these installed in two weeks (shipment won't arrive this week). Thanks to the assistance above, and elsewhere on this Forum, I'm well on my way to having some good brakes. I'll be reviewing the DIY Guy brake video again, just to be sure I've got the plan down. It's a LOT easier to do a job right once than to do it wrong, THEN do it right Last edited by SD Convert; 10-07-2020 at 02:05 PM.. |
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09-08-2020, 03:53 AM | #6 | |
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09-08-2020, 06:34 AM | #7 | |
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09-08-2020, 09:18 AM | #8 | ||
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09-08-2020, 01:35 PM | #10 | ||||
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EDIT: Just found the style number - 658. I also created a detailed "small parts" list that some might find useful. I'll post that when complete. Quote:
The rear shields are large enough to protect the rotor. If they get in the way, I'll trim them (replace later). Last edited by SD Convert; 01-08-2022 at 03:31 AM.. |
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09-08-2020, 02:53 PM | #11 | |
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uhm, i did the rear 345 rotor twin piston setup on my f30...there's no need to replace the shield. Just bend it back a bit with pliers...it took like an hour to do both sides. its painful but cheap. Ive also replaced the sealed bearings (twice) on my F30 and you are 100% correct...total pain in the arse. at least i have the tools but damn...and if you make a mistake, you'll need a new bearing. please don't ask me how know...im still mad about it. |
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09-09-2020, 09:11 AM | #12 |
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I'm having the yellow M Performance brakes installed on my 435i this Friday; the brakes are worth it, if you plan on making big power down the road. I'm not sure what you are going for, but to justify around $2500 for looks alone is a subjective matter.
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09-12-2020, 03:08 PM | #13 | |
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09-19-2020, 01:51 PM | #14 |
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The brake fluid in my front calipers was almost clear, but the fluid in the rears was a deep yellow. I ordered the parts to rebuild the calipers (seals and boots), and they were shipped via DHL Packet (claims "Delivery next day!" - at 69,00 € it should be) on the 10th, but I haven't seen any tracking updates since the 14th. I guess I'll need to flush the calipers out well and hope for the best.
Is there anyplace on this site to "reward" those companies that deliver abysmal service? If there is, who do I contact to add https://www.racing-professionals.de/ to the list? |
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09-21-2020, 10:53 PM | #15 |
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Here's the final parts list.
Calipers - I believe that any of these will work with 370/345mm rotors. For the front calipers, please verify the rotor size cast in the caliper prior to purchase. I believe that all of the rear 2-piston calipers are for 345mm rotors.
NOTE: Brembo makes it difficult to purchase the pressure seals. I've found a few vendors for these:
StopTech also makes pressure seals that they say are replacements for the Brembo parts, and cost about half as much. The StopTech part numbers for the seals are 753.99005 (40mm) and 753.99007 (44mm). They also have boots (750-99005 - 40mm and 750-99007 - 44mm) and conditioning fluid (502.10000).
Purchase of the boots from Brembo or StopTech will also save some money, as the BMW Dealer markup is avoided. Last edited by SD Convert; 10-15-2020 at 03:41 PM.. Reason: Update parts list |
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09-22-2020, 01:05 PM | #16 |
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Now for some information about the upgrade.
I took my time on this. When it was all back together, I bled the brakes three times, using a dead-blow hammer (soft face) on the calipers to shock loose any final bubbles before the last bleed. Total time was about 5 hours. After all this, the peddle is firm - no air left in the system. Also, I didn't see any signs of leaks. I believe the new brake lines helped the peddle feel quite a bit. These particular lines need something to be changed in the front, as the clip doesn't have any tension (currently held in with safety wire). When braking, it seems like the brakes aren't working properly. I think this is a combination of the pads not being bedded yet and the recoding not being done. As near as I can tell, the coding is needed because the ratio of total piston area between the front and the back has changed so much. This seems right, as the car feels like the front brakes aren't doing much. I'm getting the coding done this afternoon, so we'll see how much that improves it. |
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09-23-2020, 06:44 PM | #17 | |
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09-25-2020, 04:25 PM | #18 | |
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I hope to have some pictures up soon. My calipers were Used. I don't think a dealer would have touched it. |
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09-27-2020, 05:26 AM | #19 |
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For thread completeness, here's the three missing part numbers for your list.
Backing Plate - Left - BMW 34-11-6-872-082 Backing Plate - Right - BMW 34-11-6-872-081 Rear Caliper Bolts - M12x1.5x32 - BMW 34-20-6-850-536 Make sure you're using new caliper bolts. Book calls for them to all be replaced (especially the torque to yield ones on the rear). Front is 110 Nm Rear is 50 Nm +60˚ Last edited by zibbit; 09-27-2020 at 05:46 AM.. |
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09-27-2020, 02:21 PM | #20 | |
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Thank you for the information. |
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09-27-2020, 02:59 PM | #21 |
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those are the p/n's I had to order to do a brake job on my factory equipped '14 F30 MPE that came with the 370/345 rotor combo.
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10-05-2020, 04:12 PM | #22 | |
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I also added some possible sources for the Brembo dust boots and pressure seals and information on possible "donors" for calipers. Last edited by SD Convert; 10-08-2020 at 02:56 AM.. |
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