02-27-2014, 04:58 AM | #1 |
Private First Class
15
Rep 127
Posts
Drives: Hartge, M Xorst, Quaife, B1
Join Date: Apr 2013
Location: Surrey, UK
|
Rather than splashing out on the full M Sport brake kit I thought I'd look into replacing the discs alone on my little Bimmer and save a few grand.
Turns out that the folks in Germany have already thought of this. You can specify a cross-drilled vented set instead of just the normal vented discs for only 30 GBP more each. Special order but available as standard replacement stock. I've put 34K miles under my wheels in about a year of driving and the original front pads still claim to have 9K left to wear, but judging by the brake fade and sponginess I doubt that's really true. Will upgrade the rears to match at some point in the future. They still claim to have 14K left to run.
__________________
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21) |
02-27-2014, 06:04 AM | #2 |
Lieutenant
35
Rep 485
Posts |
Yes part numbers below for cross-drilled
http://www.realoem.com/bmw/showparts...49&hg=34&fg=07 http://www.realoem.com/bmw/showparts...70&hg=34&fg=12 Not sure if they give any advantages apart for perhaps aesthetics though? I'm thinking about getting some Endless MX72 pads on mine which are reported to give much better brake feel than the std. pads
__________________
2018 BMW E87 M2
|
Appreciate
0
|
02-27-2014, 06:21 AM | #3 |
Private First Class
15
Rep 127
Posts
Drives: Hartge, M Xorst, Quaife, B1
Join Date: Apr 2013
Location: Surrey, UK
|
I'm hoping for better heat dissipation and sportier looks at minimum cost (for a change).
__________________
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21) |
Appreciate
0
|
02-27-2014, 07:48 AM | #4 |
Life in Oversteer
0
Rep 20
Posts |
I would agree with sooty on this. When I've had crossed drilled discs in the past they only cracked so not worth the extra over standard. Money better spent on pads.
Are the crossed drilled discs any bigger? Come to think of it, are these not dimpled? |
Appreciate
0
|
02-27-2014, 01:26 PM | #5 |
Private First Class
15
Rep 127
Posts
Drives: Hartge, M Xorst, Quaife, B1
Join Date: Apr 2013
Location: Surrey, UK
|
I think the key word in the description is 'w/holes'. Shorthand for 'with holes' I'm guessing. So, no, not dimples.
__________________
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21) |
Appreciate
0
|
02-27-2014, 09:02 PM | #6 |
Major
282
Rep 1,491
Posts |
As above, I've had with cracking and warping when using drilled rotors. Personally, I prefer grooved or dimpled. If fade and sponginess is your issue, you'll probably get better results from a pad change (great to see some others, such as Endless, in the market) and fluid replacement
|
Appreciate
0
|
02-28-2014, 12:44 AM | #7 |
Brigadier General
266
Rep 3,290
Posts |
I have also always avoided cross drilled rotors, since I have seen many cracked ones at track days. I have had grooved rotors, though.
Changing rotors or fluid will usually make no noticeable difference to the brake performance and feel, unless there was air trapped in the brake fluid. Pads can make a huge difference. |
Appreciate
0
|
02-28-2014, 01:58 AM | #8 |
Major
220
Rep 1,231
Posts |
Brake performance
I must say that virtually every performance aspect of the M135 has exceeded my expectations except brakes, which I always felt lacked initial bite. They did improve after a few hundred miles but not to the point they are at the same level as the rest of the car.
Would be interested to hear if a pad swap brings marked improvements |
Appreciate
0
|
03-02-2014, 05:10 AM | #10 |
New Member
0
Rep 6
Posts |
As others have mentioned cross drilled discs will most likely crack or warp. I've upgraded the brakes on every car I've owned. The best discs are those that are grooved and vented from what I've used. Cross drilled look good but don't add much in the way of performance in my experience. In fact I grew to hate them as they were more prone to shudder if used at the track.
I usually go for pads first, then upgraded brake fluid, then braided lines and then discs. I also added a mater cylinder brace in my WRX. I also like pads with good initial bite where some people hate them. I've also added temporary brake ducts for previous cars at track days. I think pads will make a big difference if you can find some to suit. |
Appreciate
0
|
03-13-2014, 05:44 AM | #11 | |
Private First Class
15
Rep 127
Posts
Drives: Hartge, M Xorst, Quaife, B1
Join Date: Apr 2013
Location: Surrey, UK
|
Quote:
__________________
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21) Last edited by Madgambler; 03-13-2014 at 07:46 AM.. |
|
Appreciate
0
|
03-15-2014, 08:42 AM | #13 |
Brigadier General
1779
Rep 4,516
Posts |
|
Appreciate
0
|
07-07-2014, 04:18 PM | #15 |
General
17488
Rep 25,115
Posts |
Very interesting thanks for this. Do you have a close picture of the result please, are these the same size as the M235i M Perf discs, I'd assume so. Could you disclose the actual cost per disc please or willing to PM what you got them for?
__________________
My car made front page of Bimmerpost
|
Appreciate
0
|
07-12-2014, 08:04 AM | #16 | |
Dinosaur supervisor
3030
Rep 4,214
Posts |
Quote:
http://www.leebmann24.de/bmw-17zoll-...r-3er-4er.html |
|
Appreciate
0
|
07-13-2014, 09:14 AM | #17 | |
Lieutenant
35
Rep 485
Posts |
Quote:
These are the ones you need for F22 M235i for replacing the original ones http://www.realoem.com/bmw/showparts...49&hg=34&fg=07 http://www.realoem.com/bmw/showparts...70&hg=34&fg=12 This is the BMW M Performance braking system with the larger discs and replacement calipers http://www.realoem.com/bmw/showparts...89&hg=34&fg=95
__________________
2018 BMW E87 M2
|
|
Appreciate
0
|
07-13-2014, 09:57 AM | #18 |
Private First Class
141
Rep 171
Posts |
That's not what they are saying in the item description on the leebman24 site, where they clearly mention the rotors are compatible with the M135i stock brake system (blue one).
Additionally, the last link you posted with the M performance brake system lists the same rear brake rotor : 345X24 (34206797598), so the rotors does seem to be the same size with the stock ones. |
Appreciate
0
|
07-13-2014, 11:00 AM | #19 | ||
Dinosaur supervisor
3030
Rep 4,214
Posts |
Quote:
Quote:
|
||
Appreciate
0
|
07-14-2014, 06:03 AM | #20 | |
Lieutenant
35
Rep 485
Posts |
Quote:
I think they have used the wrong image (below) in the link as they are the larger discs
__________________
2018 BMW E87 M2
|
|
Appreciate
0
|
07-14-2014, 06:14 AM | #21 |
Brigadier General
266
Rep 3,290
Posts |
It is difficult to find reliable info on the brake specs on the internet, but I have tried. My conclusion so far is that the M-Sport brakes and the Performance brakes use the same caliper. The Performance rotors are made of a different material, and are lighter at the same size.
Don't take this info as facts. |
Appreciate
0
|
07-14-2014, 01:06 PM | #22 | |
Private First Class
15
Rep 127
Posts
Drives: Hartge, M Xorst, Quaife, B1
Join Date: Apr 2013
Location: Surrey, UK
|
Quote:
But, and here's the annoying thing, the brake ducts now emit a regular 'chuffing' noise that echoes back through front windows when open. This is an audible noise that disappears under braking, i.e. is not a sticking pot or warped rotor. Braking is not affected by this noise at all and there's no adverse affect on mpg. I took a car tech for a ride and he agreed the noise was just disturbed air pulsating through the standard duct.
__________________
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21) |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|