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Thread: brakes

  1. #1
    Registered Member
    tulsa, OK, United States
    Member No: 114163 Tulsa is an unknown quantity at this point Tulsa's Avatar
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    I am having a slight problem with the power steering and braking at the same time.
    If I try and steer the car around a corner while braking the steering seems to catch until the brake is released.
    I had a new combo master cylinder installed about a year ago....
    fluid levels are fine....
    The car is a 97 840
    If anyone has a fix suggestion I would really apreciate it.
    thanks in advance!

  2. #2
    Registered Member
    Mexico, MO, United States
    Member No: 89637 mlweaver is an unknown quantity at this point mlweaver's Avatar
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    It might be blockage of fluid or a failing pump in the hydraulic (pentosin) system. I am thinking that there may be inadequate pressure to boost both the brake and steering at the same time.

    If your fluid level is OK (as you say), then it might be the pump. I had to replace the pump at about 100,000 miles for the same reason. In my case, the symptom was much worse at low RPMs, and disappeared at high RPMs. (I am also assumimg that the systems are the same on an 840 as on my 850 - correct me if I am wrong about that.)

    just a guess ...
    Mark W in mid-MO
    2008 335xi coupe
    1993 850Ci 6-speed

    2 turbos ..................or 12 cylinders, no waiting!

  3. #3
    Registered Member
    , SC, United States
    Member No: 56726 lezonebay is an unknown quantity at this point lezonebay's Avatar
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    try pressurinzing the system by turning the

    wheel all the way to left and all the way to right 3-4 times each direction.

    Pump the brake pedal with the engine running 10 times and with engine shut 20 times.

    Then check the pentosin level and also check (verify) that a correct Pentosin was used. Earlier cars take a different Pentosin and have heard of incidents when the shop used the wrong kind.

    If none helps, my bet on the booster too.

    1997 BMW 840CiA
    1990 BMW Z1
    1999 BMW 528iT (Hauler mobile)
    2002 Astro Van AWD
    2003 Nissan 350Z Enthusiast Package
    1987 BMW 535i with 5spd manual (for sale)
    1992 BMW 735iL (needs head and interior)
    1977 BMW 320i (project racecar)
    2007 Mazda CX9 AWD (Wife mobile)
    1998 Yamaha Blaster+Breeze

    1995 850CSI CD00177 (SOLD)

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