So I am well aware of the common issue. Hard pedal that becomes soft/normal after a few seconds.
Purchased a used one, had it installed, new fluid. better, but not 100%... What next? The pressure switch? Is there 1 or 2? Where to go.. My mechanic is claiming it could be the brake master cylinder, but at nearly 1000$ I am not so sure I want to try it just yet.
Any help would be appreciated..
['07 BMW M5/6.:Indianapolis Red/Black:.
Toys
'93 BMW 850i J Spec- (DiamondSchwartz)-CSI Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
94 BMW 850 CSi - OE
91 BMW 850Ci Manual
'88 BMW 635CSi ACS's++
'81 MB 500 SEC Koenig (pearl white)
00 BMW 750iL J Spec- Alpina Mods
06 MB S65 AMG
09 911 4S
11 BMW M3 DCT Competition
12 BMW 328i M Sport Convertible
+++
From your description of the problem it looks like the brake master cylinder. There are 4 seals inside and some other parts, I posted the details here in post 7 https://www.bimmerforums.com/forum/s...inder+bakelite
instead of repairing and sourcing the rare gaskets which are officially not available, get a reman one. Or contact master6 if he repairs them too, he repairs the brake booster units.
Shogun tricks and tips for the E32 series are HERE!
['07 BMW M5/6.:Indianapolis Red/Black:.
Toys
'93 BMW 850i J Spec- (DiamondSchwartz)-CSI Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
94 BMW 850 CSi - OE
91 BMW 850Ci Manual
'88 BMW 635CSi ACS's++
'81 MB 500 SEC Koenig (pearl white)
00 BMW 750iL J Spec- Alpina Mods
06 MB S65 AMG
09 911 4S
11 BMW M3 DCT Competition
12 BMW 328i M Sport Convertible
+++
If it's just the master cylinder, you can use one from an e32. It worked well for my 91 850 (no mods, all stock). I believe the only difference is 1mm in the bore size (I didn't notice a change, but don't drive my 8 all that often) It's Under $200 (at least here in the US) and a fairly easy change.
https://www.bimmerforums.com/forum/s...BMW-850i-(e31)
My Cars - 1991 BMW 850i - mine for fun, 1993 Saab 900c - mine for fun, 2008 Lexus is250 - my daily driver, 2003 Dodge Durango - my wife's, 1994 Acura Legend - gave it to kid
['07 BMW M5/6.:Indianapolis Red/Black:.
Toys
'93 BMW 850i J Spec- (DiamondSchwartz)-CSI Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
94 BMW 850 CSi - OE
91 BMW 850Ci Manual
'88 BMW 635CSi ACS's++
'81 MB 500 SEC Koenig (pearl white)
00 BMW 750iL J Spec- Alpina Mods
06 MB S65 AMG
09 911 4S
11 BMW M3 DCT Competition
12 BMW 328i M Sport Convertible
+++
Search for 34311156643 and you should find it (it's not the brake bomb, that is the sphere thing that holds pressure. I didn't change that on mine). The MC cured all my braking issues. (the link is a write up of my change). It didn't take all that all to do. A lot of the time goes into bleeding the brakes (unless you have a lift and don't have to move a jack around).
My Cars - 1991 BMW 850i - mine for fun, 1993 Saab 900c - mine for fun, 2008 Lexus is250 - my daily driver, 2003 Dodge Durango - my wife's, 1994 Acura Legend - gave it to kid
['07 BMW M5/6.:Indianapolis Red/Black:.
Toys
'93 BMW 850i J Spec- (DiamondSchwartz)-CSI Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
94 BMW 850 CSi - OE
91 BMW 850Ci Manual
'88 BMW 635CSi ACS's++
'81 MB 500 SEC Koenig (pearl white)
00 BMW 750iL J Spec- Alpina Mods
06 MB S65 AMG
09 911 4S
11 BMW M3 DCT Competition
12 BMW 328i M Sport Convertible
+++
I've been lucky. I've had my 8 for almost 20 years now with minimal expense. But I think things are starting to catch up with me. Need a new headliner and a "Trans Fail Safe Prog" just started to pop up (hopefully it was just a fluid level thing). Unless you have the $$$$, it's not a car for the average joe. Bringing into the shop for anything is a major expense. That's why I try to do all the work myself. Just learning as I go (and so far no real problems). Good luck with the MC.
My Cars - 1991 BMW 850i - mine for fun, 1993 Saab 900c - mine for fun, 2008 Lexus is250 - my daily driver, 2003 Dodge Durango - my wife's, 1994 Acura Legend - gave it to kid
ATE for $163 at FCPEURO 34311156643 BMW Brake Master Cylinder - ATE 34311156643 for E32 750, and the older E32 735 with H31 brake booster unit. Part #: ATE-010210
and the cheapest one for abt. $70 are from Uro, but there I would go for ATE quality, safety is one thing + installation time is the other thing
Last edited by shogun; 03-27-2019 at 11:29 PM.
Shogun tricks and tips for the E32 series are HERE!
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