Question about 1992 BMW 5 Series

2 Answers

I have a BMW 520i 1992 car .. and here is the problem : it happens when I push the brake pedal .. I feel like something is knocking under my foot .. and sometimes the rear wheels brakes catch unexpectly for a while on slow speeds ..

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  • mohammad_fir Aug 13, 2011

    thank you jturcotte, for replying .. I hope you provide me the instructions to do it myself.

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2 Answers

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  • BMW Master
  • 8,980 Answers

Hi, what you feel is your anti-lock brake actuator pumping the brakes. This is probably due to dirty/dusty or improperly adjusted brake shoes causing the rear brakes to lock. It is also possible that you have a leak in one or both rear brake cylinders. Have your rear brakes checked, cleaned, and adjusted. If you would like to do it yourself, I can provide instructions--just let me know.

Posted on Aug 13, 2011

  • mohammad_fir Aug 13, 2011

    thank you jturcotte, for replying .. I hope you provide me the instructions to do it myself.

  • Jeffrey Turcotte
    Jeffrey Turcotte Aug 13, 2011

    Well, after taking a closer look, I see you have disc brakes in the rear. So it isn't as obvious what is causing the locking, but usually it's the pads. So, I'm pasting instructions for inspection and pad replacement. Please let me know if you have any questions.


    INSPECTION



    1. Check the pad for thickness. The minimum friction material thickness allowed by BMW is 0.08 inches (2.0mm).



    2. Check the condition of the friction material. If the friction
      material is cracking or coming loose from the backing plate, replace the
      pads.




    3. Check the pattern of wear of the friction material. If the pads
      are wearing unevenly or on an angle, there may be a problem with the
      caliper hanging up on its slides.




    4. If the inside pad is worn more than the outside pad, the caliper
      may not be sliding on the pins. Clean and check for free movement of the
      caliper.




    5. If one sides set of pads wear more than the other, the caliper
      with the unworn pads may be frozen. Check that the piston retracts
      smoothly and that the dust boot is intact.



    REMOVAL & INSTALLATION
    See Figures 1 through 8








    Fig. Fig. 1: Remove the clip spring before removing the slide pins











    Fig. Fig. 2: Remove the caps to expose the internal hex slide pins











    Fig. Fig. 3: Make sure the wrench is fully seated in the slide pin to prevent stripping internal hex











    Fig. Fig. 4: Inspect the slide pins for corrosion and pitting once removed










    Fig. Fig. 5: The inside pad will stay with the caliper and the outside pad will stay with the lower mount






    1. Raise and support the vehicle. Remove the rear wheels.



    2. Disconnect the brake pad wear sensor from the harness.



    3. Carefully pry the pad retainer spring out from the hub side and remove.



    4. Remove the plastic plugs from the caliper slide bolts and remove the bolts. Remove the caliper and the pads from the caliper.




    To install:










    Fig. Fig. 6: Press the piston back in the caliper. Use an old pad to protect the piston when using a C-clamp










    Fig. Fig. 7: The inside pad has a spring holding it in the piston bore










    Fig. Fig. 8: The upper pad is the outside pad and the lower pad with the spring is the inside pad






    1. Clean the brake caliper and all sliding surfaces. Press the
      caliper piston fully back into the caliper housing. Check for leaking
      fluid, damaged dust boots and frozen pistons.




    2. Install a new brake pad wear sensor in the pad if the plastic part
      has been worn through on the old sensor. New sensors are not required
      unless the wire inside the plastic part has been exposed.




    3. Install the brake pads in the caliper. Lower the caliper over the
      caliper mount. Install the bolts and torque to 18-22 ft. lbs. (25-30
      Nm). Install the retainer spring.




    4. Connect the brake pad wear sensor to the harness. Check for a good
      connection as most problems with the sensor circuit are caused by
      faulty connections. Check that the wire is held by the loop in the dust
      cover and the connector is held at the clips.




    5. Install the wheels and torque to 65-79 ft. lbs. (90-110 Nm).







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  • BMW Master
  • 2,817 Answers

You need a brake over haul, if discs are fitted check disc run out, pad thickness , and the caliper pistons are not binding repair any faults. If drum brakes fitted remove drums clean out dust , inspect fore ware, replace brake shoes if worn, replace wheel cylinders. flush master cylinder , bleed air from system.

Posted on Dec 04, 2015

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