E65 brake master cylinder on E39 - Page 5 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #41 of 53 Old 22nd April 2019, 04:39 PM
jmarch
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Originally Posted by bdiefAZ View Post
The Edelmann fitting is what we used. Part number 267000
Thanks. For anyone else looking, Amazon has this as well if you search by the part number.
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post #42 of 53 Old 2nd May 2019, 04:37 AM
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You can read my existing situation at the bottom of the page here:

https://www.m5board.com/vbulletin/e3...ulic-unit.html

Last month, I was on track at Summit Point for four hours over two days. My mushy brake pedal was terrible and did nothing to inspire late braking confidence. Oddly, I scorched the rear rotors and the rear pads were shot. I had a terrible vibration when braking by the end of the weekend and all the way home. I've since replaced the rear pads and turned the rotors - they are still within spec. Vibration gone. New Brembo slotted friction discs on order.

After following this thread and with much skepticism, I replaced my fairly new e39 master cylinder with a new e65 one. I bleed the brakes using Autologic to cycle the ABS pump each time I cracked a bleeder nipple. I used my Schwaben pressure bleeder on the new master cylinder and a vacuum pump on the nipple. I flushed the system with ATE Super Blue fluid.

I am thrilled to tell you that the brake pedal is firm near the top of its travel and it does not sink to the floor! I wouldn't say the pedal feel is quite as good as my low mileage car but it's pretty close and far better than it has been in years!

I will be at Pocono Raceway this weekend. I can report back how the pedal feels afterwards if anyone is interested.

Many, many thanks to whoever figured out this solution. For me, it worked better than I'd hoped for.

Doug

1988 M5 Black
1993 e30 s50 'vert
2001 M5 S2, Black
2003 M5 S2 w/Dinan cams, Blue
2004 M3 S3-R 'vert
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post #43 of 53 Old 2nd May 2019, 03:16 PM Thread Starter
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Glad to see people reporting positive feedback on this.

I just installed new brake pads in my D2Racing BBK and the brake pedal is nice and firm now, so I won't be messing with the MC for the time being.
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post #44 of 53 Old 10th May 2019, 09:26 PM
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Update. The MC is installed (along with all new lines). Brake feel is definitely improved though there's still a slight bit of initial travel before they bite that I don't like. I'm sure there's no air in the system so next I'll be looking at the calipers which are original. Overall I'm pleased but there's more to do.
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post #45 of 53 Old 23rd May 2019, 01:35 AM
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post #46 of 53 Old 24th May 2019, 09:22 AM
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This is one of the best mods I have done to the e39, I drove it the other night and enjoyed braking in it!
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post #47 of 53 Old 24th May 2019, 04:36 PM
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LV fluid TIS

I am delighted that others are seeing positive results with this upgrade, OEM+ is absolutely my style whenever possible. I have always been severely disappointed in the brake feel of my car even after a complete consumables-rebuild of the entire system.

My concern is that the larger MC masks the problem rather than addressing root cause. This is evident by the fact the early adopters of this mod are experiencing a firmer pedal, but still excessive initial travel.

My next experiment will be to do a complete Autologic flush with LV brake fluid. The RBF 600 I have in the system is probably on the other end of the spectrum as far as viscosity. Round 2 will be a INPA bleed with pressure bleeder attached.

TIS 34 00 050 attached. I suspect the requirement for low-viscosity fluid in the ABS/DSC might be related to this phenomenon.
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2002 Beast Schwarz-Metallic/Blk Sport

Last edited by KrautHammer; 24th May 2019 at 04:39 PM.
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post #48 of 53 Old 26th May 2019, 12:46 AM
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Krauthammer, I use ATE SL6 fluid for all of my BMW's , best street brake fluid that I have tried on any car. I have tried several other fluids, this one seems to give the best pedal feel, likely attributed to the low viscosity.

For the record, in addition to BMW, I have used it on Ford trucks, Toyota Trucks, Acura, Mazda, and other cars.
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post #49 of 53 Old 26th May 2019, 01:35 AM
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Bosch ESI6 is also worth a look IMO. Dry boiling point of 518ºF, wet of 365ºF, viscosity is 670 mm^2/s at -40C. Those specs surpass ATE SL6 on all counts. If you're tracking the car you might still want something like Castrol SRF, but for street duty it's hard to beat this stuff at $15/liter.
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post #50 of 53 Old 27th May 2019, 08:46 PM
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Terraphantm, that brake fluid sounds great, even lower viscosity as well. I really think that the low viscosity is key to modern abs systems. For a while my "go to" was the ATE 200, better feel with the SL6. No tracking with my car, would like to try it tho.
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