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Thread: DIY Brake Booster Re-build with 5 new o-rings

  1. #1
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    DIY Brake Servo Booster Re-build 7 piece kit

    Hi forum members,

    I have made some recent changes in the DIY repair kit and rebuild service, as of 2-8-13.
    Please refer to my DIY link.

    For the following cars, with a Hydraulic brake servo booster, and ABS.

    e28, 525,528,533,535,m535,m5;
    e24, 628,633,635,m635,m6,L6;
    e32, 730,735,750;
    e23, 728,730,732,733,735,745;

    This Do It Yourself (DIY) is to re-build the Brake Servo Booster #34331156925.
    On the e23 it is part # 34331152825
    The e23,e24,e28,e32 735 all of the 7 piece interior repair kit are identical., for both part numbers.

    On the e32 750 there is a different part # 34331161772, it uses a shaft seal instead of an o-ring on the firewall end.
    It is slightly more expensive.

    Here is a link to the DIY brake servo booster re-build kit, with 6 o-rings and a 9.5mm i.d. shaft seal.

    https://www.bimmerforums.com/forum/s...rrent-websites

    Please read the captions at the bottom of each photo for info.
    Last edited by master6; 08-27-2018 at 05:02 AM.
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

  2. #2
    Join Date
    Sep 2008
    Location
    roseville Ca usa
    Posts
    189
    My Cars
    1985 bmw 635csi euro

    excellent job

    great writeup. what were the symptoms of the failing brake booster?

  3. #3
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    Booster Failure

    Leaking ATF form the end of the booster grub screw at the junction of the M/C large o-ring. You can get this o-ring at Napa auto parts, I read this on a forum, cannot comfirm.
    The repair can be done while still on the car. And you do not need my set of 6 o-rings, and shaft seal.

    If it is leaking from the fire wall end, into the footwell. Then this re-build set of o-rings, is what you need.

    I rebuilt all 4 brakes, replaced the accumulator, and I reasoned that the only way that all 4 of the brakes could lock on was because of something exerting alot of pressure, ie the booster.
    I could not afford the price of a new or re-built booster, so I took it apart, measured the o-rings, ordered and installed them, and it worked. While everything was apart, I also decided to replace the M/C with a rebuilt unit from a 750i, it was less expensive.

    I have sold these 7 piece kit to 35 fellow forum members.

    I found a few months later this re-call notice, for the M/C.

    http://www.allworldauto.com/inv/NHTS...ion_73163.html

    So now I am not sure if my booster was defective, mine was not leaking. Their may be others who know what the other symptoms are, when a booster has failed.

    https://www.bimmerforums.com/forum/s...rrent-websites
    Last edited by master6; 08-27-2018 at 05:04 AM.
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

  4. #4
    Join Date
    Apr 2010
    Location
    Sacramento
    Posts
    682
    My Cars
    1988 Bmw 635csi & 84 633
    This is whats happening to me right now " Leaking ATF form the end of the booster grub screw at the junction of the M/C large o-ring." You mention you don't have to remove the booster? is this correct? I got the 44mm od o ring at napa for a little over a $1 part #727-2626, but you don't mention the sizes of the other o rings or the white nylon one at the firewall with the oring... Thanks for the pics, really sets my mind at ease I can do this...

  5. #5
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    Hydraulic brake servo booster repair kit and rebuild service

    Hi Forum Members,

    I have made some recent changes in the DIY repair kit and rebuild service, as of 2-8-13.
    Please refer to my DIY link.

    For the following cars, that have a Hydraulic brake servo booster, and ABS.

    e28, 525,528,533,535,m535,m5;
    e24, 628,633,635,m635,m6,L6;
    e32, 730,735,750;
    e23, 728,730,732,733,735,745;

    This Do It Yourself (DIY) is to re-build the Brake Servo Booster #34331156925.
    On the e23 it is part # 34331152825
    The e23,e24,e28,e32 735 all of the 7 piece interior repair kit are identical., for both part numbers.

    The e32 750 has a different part # 34331161772,
    It uses a shaft seal instead of an o-ring at the firewall end. And is slightly more expensive.

    I recently rebuilt another hydraulic brake servo booster, and I was amazed at how the rubber o-rings were deformed. They are now an oblong shape. The large o-ring 38.0mm x 3.0mm, at the front of the booster. It now measures 2.55mm high instead of 3mm. And is 3.28mm thick, were it should be again be 3.0mm. And it is noticeably more brittle. The smallest o-ring was brittle and it broke when removed.

    https://picasaweb.google.com/113565887645138328387/BrakeServoBoosterReBuild5NewORings?authkey=Gv1sRgC KnZ_Z7f6JrUyQE#

    BOOSTER REPAIR SERVICE

    I am now offering to rebuild your booster for you, using my 6 piece repair kit. For the e23,e24,e28,e32(735).
    The price is $80.00 + shipping back to you. Cont USA only, USD.
    If you send me your address, I can give an accurate shipping quote.
    Via FedEx Ground home delivery, with tracking.
    And I will send you my address.
    Just send your booster to me, with a $ check.
    Insure for $190.00
    PayPal add 4%.

    For the rebuild of your e32 750, please refer to my DIY link.

    REBUILD WITH CORE

    I also have a couple of spare rebuilt boosters, and I can send one to you. For the e23,e24,e28,e32(735).
    And you return your old core to me, shipping on you. Insure for $190.00
    Same price of $80.00 + ship + $75.00 core. Cont USA only, USD.
    Core charge refunded via PayPal.
    PayPal add 4%

    For the rebuild of your e32 750, please refer to my DIY link.

    Send me an e-mail to get started jay_c_stratton@hotmail.com
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

  6. #6
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    New upgraded method to facilitate the booster repair

    Hi, fellow Forum members,

    I have just updated my DIY brake servo booster repair tutorial.

    I had a 6er owner contact me, that did not want to have to grind the sides of his booster.

    Rob from Roadfly had this great idea. This new method does not involve the need to do the grinding.

    I went to the hardware store and got the the parts needed. And tried it out.

    It worked!

    I took photos and added captions and have incorporated this new method into my DIY booster repair.

    So check it out!

    https://picasaweb.google.com/113565887645138328387/BrakeServoBoosterReBuild5NewORings?authkey=Gv1sRgC KnZ_Z7f6JrUyQE#
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

  7. #7
    Join Date
    Jan 2012
    Location
    Garage
    Posts
    109
    My Cars
    1988 BMW M3
    Thats great. My brakes just started acting up on me. Hopefully, refreshing the brake fluid will be enough and I wont need to delve into it further.

  8. #8
    Join Date
    Nov 2012
    Location
    Chicago, Ill.
    Posts
    7
    My Cars
    1984 BMW 633CSI
    Hello Master6, I ordered two brake boosters, one at a time, hoping that the first one would work, after installing them both booster leaked, I returned the first one, in the process of sending this one back. Do you have a rebuilt one I can buy from you, or can you rebuild mine
    Thanks REG633

  9. #9
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    Booster repair service

    Hi REG,

    Yes, I have a spare for a 633, that I can send to you. Repair is $80.00 + ship + $75.00 core, refundable via PayPal. Just give me your address and I can give you an accurate ship quote via FexEx ground home delivery with tracking.
    PayPal add 4%.


    Or you can send me yours, and I will repair it for you. Just $80.00 + return shipping. You can enclose a check $, in with the booster. Send me an e-mail, and I will give you my address.
    jay_c_stratton@hotmail.com

    https://picasaweb.google.com/1135658...KnZ_Z7f6JrUyQE#

    I offer a TWO year WARRANTY, plus I will pay for shipping both ways.

    There is a back storey to this tale, Reg, told me that the two new boosters that failed were from A-1 Cardone, After Reg installed my booster, he sent me the 2nd failed Cardone booster as my returned core.
    When I opened it up to rebuild for my next client, I found that the Shaft Seal was installed upside down.
    Because it was put in backwards the garter spring came off.
    The Shaft Seal was made in China, and was also the incorrect ID, it was 10.0mm, and should have been 9.5mm which is the Factory spec OEM size.
    I wrote up a post about this warning Forum Members about BAD boosters that were being sold, by Cardone,
    Search BAD Boosters,

    Best,

    Thanks,
    Last edited by master6; 04-23-2016 at 08:40 PM.
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

  10. #10
    Join Date
    Oct 2013
    Location
    Raleigh, NC
    Posts
    2
    My Cars
    1985 BMW 635 csi
    Jay: I have been trong to order two sets of the

    - - - Updated - - -

    Jay;
    I can not pay for two sets of repair kits for my1985 E24. Pay pal will not accept your emal
    can you offer another method of payment>

  11. #11
    Join Date
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    Hydraulic brake booster servo DIY repair kit, for e23,e24,e28,e32

    Quote Originally Posted by meftekhar View Post
    Jay: I have been trong to order two sets of the

    - - - Updated - - -

    Jay;
    I can not pay for two sets of repair kits for my1985 E24. Pay pal will not accept your emal
    can you offer another method of payment>
    Hi,

    My PayPal account # is my e-mail address, make sure to use the under score, like this , shift key _
    Also if you copy-paste, my e-mail, it does not always work with PayPal, please enter my e-mail address by typing it in manualy.
    jay_c_stratton@hotmail.com

    Or you can send a check.

    Jay Stratton
    2514 N. Tustin Ave. Unit E
    Santa Ana, CA. 92705

    2 - kits at $18.50 = $37.00 + mail $2.25 = Total of $39.25

    Best,

    Jay
    Last edited by master6; 04-23-2016 at 08:27 PM.
    Jay
    '88 M6 Cinnabar Red / Nappa Natur Highline Interior (10-87) Santa Ana, California. USA

    My NEW Website, Link : https://www.jaysbmwparts.com

    Booster repair
    https://www.jaysbmwparts.com

    A/C Wingcell Compressor leak repair
    https://www.jaysbmwparts.com

    e31 Door Handle Fix,
    https://www.jaysbmwparts.com

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