10-08-2020, 01:35 AM | #1 |
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Improve pedal feel/cold bite
So, Iv a 2016 340i, blue msport brakes.
Ever since Iv had the car Iv thought the brakes were a bit meh, looked better than the worked was my initial impressions, the car was coming up for its brake fluid flush so was hoping that would change things as the fluid was pretty dark looking so figured it was due a bleed/fresh fluid. Got that done and the pedal feel didn’t really change much Sooo figured since I’d had good results with previous cars I bought a set of DS2500’s and installed them (new pads front and back). Gave the disks a good scrub up to remove any old pad transfer and set about bedding in the DS2500’s as per recommended. Fast forward to today, about 200 miles on the new pads and the pedal / cold bite is still very meh.... now I know performance pads can some times trade of cold bite performance vs high temp performance, and the brakes do work and fade isn’t really became an issue yet, but I’m just a bit disappointed on how poor the pedal feel is..... Normally decent pads and fluid and I’m happy enough with my road cars pedal feel but this car isn’t like that.... I’m half tempted to try bleed the brakes my self as they do feel a bit numb. Anyone else running DS2500’s and find the brakes much the same as oem pads? I didn’t think in this day and age (and mainly because my E91 335d didn’t) need braided brake lines unless track work was your plan... but starting to think it might be the only thing that might help in my case. |
10-11-2020, 06:11 PM | #3 |
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OE pads have all the cold bite you need. That's why they are OE, and the reason they create so much dust. The pagid pads yoh have are definitely not like OE pads.
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10-11-2020, 07:57 PM | #4 | |
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Drives: 2015 BMW 335i x-Drive Auto
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Brake pedal mush is easily solved by replacing rubber hoses with stainless steel brake lines. Labor is negligible if done at same time as brake fluid replacement. See photo for part numbers for StopTech SS Lines which I've used for a couple years. There are several brands of SS lines available for the F3x. Brake pad bite is a function of pads and rotors. BMW pads are no better than average bite. Hawk 5.0 pads have the best bite by far and instant warm up. See photo for part numbers. A 340i with blue M Sport Brakes has Front 370mm and Rear 345mm brakes. Plain rotors have average bite. If you look at street performance models from Porsche, Mercedes, McLaren, etc they use crossdrilled rotors. Crossdrilled have best bite by far and they are superior in rain because water can't trap between pad and rotor surfaces. Even replacing just front rotors with crossdrilled can help a lot because fronts do much of the work. The combination of Hawk 5.0 pads with crossdrilled rotors provide incredible bite. For instance, Zimmermann has a Front crossdrilled Rotor in 370x30, part number 150.2911.52 for ~$113 each the last Tim I checked price. StopTech makes a beautiful set of directional crossdrilled: Front 370x30 128.34144L 128.34144R Rear 345x24 128.34147L 128.34147R The Zimmermann crossdrilled part number is more readily available in Europe and the StopTech and Hawk products are more readily available in the US. If you are in Europe, Zeckhausen Racing ships from US, takes ~5 days. See website and contact them for information. https://www.zeckhausen.com/ Hope this helps! |
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10-11-2020, 08:36 PM | #5 | ||
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At this moment in time im not looking to change the pads, like i said i dont think this is as much a pad issue as you would think. Im gonna try bleed the brakes first as thats free, then look at changing the lines if your saying that solved your issue, we have loads 2 main companys here in the Uk that do lines for the car so getting them wont be an issue. Just a bit disapointed tbh wondering if maybe they are just a bit over servo assisted, the e91 335d was never like this. I have a feeling il be picking up some lines in the black friday sales. |
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10-11-2020, 09:22 PM | #6 |
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Oops meant Ferodo
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10-12-2020, 10:31 AM | #7 | |
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As stated by others here cross drilled, dimpled, and or slotted rotors would improve performance a lot, but I get the impression that you do not track your car, and are looking for a more economical solution which leaves you with 2 options. Better brake fluid, and stainless steel brake lines. You did not state which brake fluid you used, but what will help (if you did not use it) is a good quality DOT-4 "high temperature" fluid which is made by several manufacturers. The 2 best are Motul 660 and Castrol SRF, but others are used with good results as well. All of them are more expensive than regular brake fluid, but are well worth it. Stainless steel brake lines can also improve pedal feel, and are not very expensive so why not. Especially if you are changing the fluid at the same time. Hopefully these changes will work for you, but if not then you might try changing to the Hawk 5.0 pads. I have not tried them myself, but many people swear by them. Good luck.
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10-12-2020, 12:58 PM | #8 | |
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Im not a brake noob btw, iv got a 500bhp focus RS that i race with AP racing brakes, slotted rotors, SS lines and run castrol SRF in it... but at £45 a Ltr its expensive stuff. Brake fade hasnt been an issue (old pads) and i havnt really gave the new pads a hammering yet to say if it will be (but im not expecting them to be tbh) The fluid was what ever bmw use as it was done as part of the service with them, Its still fresh as my fluid tester said it had less than 1.5% water content which is expected seeing as its only a year old fluid. Dont want to go down the slotted route, for a daily drive that enjoys a bit of sprinted driving every now and then but no track work its an expensive option to a problem i feel i shouldnt have. Think im going to bleed the system, then try lines, il report back my findings! |
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01-19-2021, 03:41 AM | #9 |
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planning also to upgrade my disc with this, but now i hear people saying, this is a 1-piece disc compared to the oem 2-piece disc or other 2-piece disc .
is the stoptech disc a good choice, of better stick to oem or other 2-piece disc suppliers ? my car is a bw m240i xdrive 2017 regards |
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01-21-2021, 01:56 AM | #10 | |
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01-21-2021, 09:09 AM | #11 | |
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Last edited by Boomer 2019; 01-21-2021 at 07:39 PM.. |
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01-24-2021, 09:52 AM | #12 | |
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But i can not find any review people driving with this brake disc |
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