E65 brake master cylinder on E39 - Page 2 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #11 of 45 Old 13th March 2019, 03:27 PM
josiahg52
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Originally Posted by sreten View Post
Thanks for your input, Peter. That would be the right way to go about it but I don't want to do heavy modding. I suggested E65 MC because it's slightly bigger, cheap and easy bolt-on part.

At the moment, I'm struggling to find brake pads that fit my stupid D2Racing BBK. 2 sets of Ferodo DS2500 delivered and none of the fit in the caliper properly despite proper dimensions and them being listed as correct pads for this application. Looks like I'll have to go with default D2Racing pads.
If the plates are in good condition, Carbotech can attach new pad material to them using one of their compounds, matching the profile amd size of the originals. I like the 1512 Bobcat for daily driving. Not sure of cost, though.

2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
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post #12 of 45 Old 13th March 2019, 03:57 PM Thread Starter
sreten
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Interesting idea. Although, given that I'm in Europe and Carbotech is in the USA, that would probably take forever.

I'm talking to Ferodo support, few online shops and useless D2Racing customer support to see if there is a pad that would fit.
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post #13 of 45 Old 20th March 2019, 08:20 AM
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I ordered the E65 master cylinder, will post my results after installation.
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post #14 of 45 Old 20th March 2019, 04:37 PM
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I ordered the E65 master cylinder, will post my results after installation.
Thanks in advance!
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post #15 of 45 Old 21st March 2019, 10:56 PM
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Waiting with baited breath for the results on this one. I don't think that the stock brakes lack power, they will activate ABS at 140mph... But I have never been happy with the amount of travel or pedal feel.

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post #16 of 45 Old 2nd April 2019, 01:52 AM
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Mod done, I will write up the details and how to tips later.

Someone please send me a crowbar to remove smile from my face, it exceeded expectations.
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post #17 of 45 Old 2nd April 2019, 02:40 AM
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Mod done, I will write up the details and how to tips later.

Someone please send me a crowbar to remove smile from my face, it exceeded expectations.
Fantastic. Looking forward to your write up.
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post #18 of 45 Old 2nd April 2019, 09:43 PM
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Originally Posted by bdiefAZ View Post
Mod done, I will write up the details and how to tips later.

Someone please send me a crowbar to remove smile from my face, it exceeded expectations.
Holy crap, this sounds like great news, do please share details!!
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post #19 of 45 Old 3rd April 2019, 07:17 AM
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Stefan and I swapped out the master cylinder on the e39 M5 with the master cylinder from the e65. The cylinder diameter is increased to 27mm from 25.4mm for the front brakes, the rear remains 20.64mm

Remember - Use Caution, brake fluid eats paint!

Access Brake Master Cylinder by removing Cabin Filter
Drain Master Cylinder
Remove Cover Shelf above the brake Booster in engine bay
Loosen pipes from Brake Master Cylinder
Inside the car, release the brake pedal cross pin from the booster and remove the 2 bolts holding the brake booster to the chassis
Use master cylinder as a lever to raise the assembly, then remove the master cylinder from the booster
Installation is reverse of removal

Raise car, remove wheels
Power bleed braking system, we bled the system twice with engine running, starting from RR, LR, RF, LF.
Torque Wheels
Parts Needed:

• BMW Master cylinder Part Number 34 33 6 785 926 or 34 33 6 797 650
• M10 to M12 Brake line adapter
• ATE SL6 Brake Fluid

In order to make the e65 master cylinder work there are 2 modifications needed:

· The M10/M12 brake line adapter is used in the driver’s side port shown in photos below. The Brake line on the car is M10, the port on the master cylinder is M12.
· The Mounting flange on the new master cylinder must be modified as shown for reservoir mounting clearance. Some material must be removed from the flange by a cutting wheel in order to for the reservoir to mount.





The braking system responded very well to this modification with more response to the brake pedal that is easily modulated. The calipers on my car are stock BMW M5 brakes with Goodridge SS hoses, ATE SL6 fluid, and EBC red pads on the calipers. My car has over 120k on it, so some of the improvement comes from replacing a 17 year old master cylinder, the remainder of the improvement comes from the increased cylinder diameter of the new master cylinder.

I can email photos if someone else can post for me, I cannot post photos to this site.

Last edited by bdiefAZ; 3rd April 2019 at 09:09 AM. Reason: Cannot post photos
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post #20 of 45 Old 3rd April 2019, 03:05 PM
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If you need to just throw the pics up on dropbox or google drive or something and then share the link here. But your problem is probably that you just need to resize them, this site has a really low limit for picture size. I think they can only be 1000x1000 pixels max. You can resize them quickly down to this with Microsoft Picture Manager.
Can you share where you sourced the M10 to M12 adapter from? I only see ones that have a inverted flange on the M10 side, which I don't think is correct. Thanks again!
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