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Thread: E32 735 only Hydraulic brake booster repair service

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

    Hydraulic brake booster repair kit and repair 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, with a Hydraulic brake servo booster, and ABS.

    e23, 728,730,732,733,735,745; part # 34331152825
    e24, 628,633,635,m635,m6,L6; part # 34331156925
    e28, 525,528,533,535,m535,m5; part # 34331156925
    e32, 730,735,750;
    the 750 part # 34331161772 and requires a different seal at the firewall that is slightly more expensive, than a o-ring.

    I up dated this DIY, I added the 9.5mm I.D. seal and a how to replace the seal. Total 7 piece kit.

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

    Please read the written captions at the bottom of each photo.

    This repair needs to have the booster removed from the car.

    Tools needed: Dremal, vise, battery drill motor with reverse, 1-1/8 inch deep socket, 13mm 1/4 in drive socket with and a 1/4" socket extension for the drill motor, blade screw driver, 10mm or 3/8 inch metal drill bit, a powerful electric drill motor with 3/8 chuck, to drill th metal cross piece, a dial caliper, and a metric tap 8mm x 1.25.

    Dremal hobby tool at $69.00 this is a must have tool to do this job correctly! The Dremal is variable speed.
    Home Depot
    http://www.homedepot.com/h_d1/N-5yc1...&storeId=10051
    Or try Harbor Freight.
    http://www.harborfreight.com/power-t...kit-97626.html single speed

    EDIT: 12-7-12

    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 for the e24,e28,e32(735 only), part # 34331156925.
    On the e23 it is part # 34331152825
    The e23,e24,e28,e32 (735) only, the 7 piece kits are identical., for both part numbers.

    And I have also added the e32 750 part # 34331161772, which requires a different shaft seal at the firewall. And has a higher price. See the link to get prices.

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

    BOOSTER REBUILD SERVICE

    I am now offering to rebuild your booster for you, using my 6 piece repair kit. For the e23,e24,e28,e32-735.
    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.
    I will then send you my address.
    Just send your booster to me, with a $ check. Insure for $190.00
    PayPal add 4%

    For your e32 750, please see my DIY link.

    REBUILD SERVICE 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, return shipping on you. Insure for $190.00
    Same price of $80.00 + ship + $75.00 core. Cont USA only, USD.
    Core charge is refunded via PayPal.
    PayPal add 4%

    For your e32 750, please see my DIY link.

    Send me an e-mail to get started, jay_c_stratton@hotmail.com
    Last edited by master6; 08-27-2018 at 05:01 AM. Reason: Changes 2-8-13
    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
    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

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

    Changes 2-8-13

    DIY brake servo booster repair kit and rebuild service.

    Please read the captions under each photo.

    https://picasaweb.google.com/1135658...KnZ_Z7f6JrUyQE#
    Attached Images Attached Images
    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
    Nov 2010
    Location
    Santa Ana, CA USA
    Posts
    984
    My Cars
    1988 m6

    Special note!! Please Read - Some BAD brake boosters are being sold!!

    Fellow e32 owners,


    Parts Geek and its supplier A-1 Cardone, are selling bad rebuilt hydraulic brake boosters.

    I had a client of mine who sent me a leaking booster. When I opened it up to repair, I noticed that it had an incorrect shaft seal installed.

    On top of that, the shaft seal was installed up-side down, and missing the garter spring.

    My client told me that his first Cardone from Parts Geek leaked as soon as it was installed, he sent it back to Parts Geek and they sent him another.

    When he installed the second one, it also leaked.
    And thats when he called me, and I used my rebuild service and sent him one of my rebuilt spares.

    When I received his core back, I set to rebuild it for the next client.
    I was shocked, the shaft seal was upside down, I then pressed the shaft seal out of the black plastic cup. The shaft seal specs are 9.5mm i.d. x 22.0mm o.d. and thickness of 6mm.
    The A-1 Cardone is 10.0 i.d., way too big. It is made in China by YEI Shien, part #A19168 10x22x6.
    Because it was in backwards the garter spring came off, or was never there in the first place.
    I am going to also attach some photos, of the suspect seal front and back, and what a garter spring looks like.

    Here is my link, booster repair kit and rebuild service. https://picasaweb.google.com/1135658...nZ_Z7f6JrUyQE#

    Thank you,

    P4190001-001.JPGP4190003-002.JPGP4190004-002.JPG
    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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