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w202 1998

Discussion in 'Suspension, Steering & Brakes' started by workmore, Nov 20, 2012.

  1. workmore

    workmore New Member

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    Oct 24, 2012
    Location:
    doddinghurst,nr brentwood essex
    Your Mercedes:
    w202 1998 1800cc
    Hello all, my w202 has been standing a while but i renewed the discs, brake hoses, & the callipers. My problem is that i dont seem able to clear the bas/asr light on the dash for & mot.Also the haynes manual stated that after brake bleeding the master cylinder also has a bleed valve which has to be bled but i have not seen it.Has anyone encountered these faults/problems & solved them, any info will be much appreciated. AL
     
  2. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Hello and welcome, this has nothing to do with the brake fluid, the chances are you have a lot of rust on the sensors and maybe be the reluctance ring on the rear broken through rusting.
     
  3. OP
    workmore

    workmore New Member

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    Your Mercedes:
    w202 1998 1800cc
    Many thanks Television, i will jack up all round and derust the reluctance rings. I also seem to have caused a little confusion over the brakes. After renewing discs & hoses i had to bleed but having ars i thought i needed to further bleed the master cylinder but this seems to apply to pre 1995 models would you know if this is correct?
     
  4. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The bleed screws on the master cylinder where fitted is mainly meant to be bled on a new install and it does nothing much when renewing the fluid, I am pretty sure of that, where it is fitted you bleed the front side nearest the master cylinder, then undo the nipple and bleed air out,tighten and next the other front and then the rears, all different to the way one normally does it
     
  5. horgantrevor

    horgantrevor Senior Member

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    Your Mercedes:
    E220 CDI avantgarde c43//amg
    On a few w202
    I have had the BAS ASR light was fixed by replacing BAS ASR control unit under bonnet just under master cylinder three electrical Connections

    As they take in water and the board gets corroded

    If some one was to wash the engine bay it can happen weeks later

    Fastest way to find out would be get star test done but if you can barrow one from another w202 and check
     
    Last edited: Nov 20, 2012
  6. CafeMB

    CafeMB Banned

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    Your Mercedes:
    Mercedes S320 CDI
    If the system has not disintegrated like horgantrevor said, it might be a simple fix turning the steering wheel from left to right and then back again until the light goes off.
     
  7. television

    television Always remembered RIP

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    Your Mercedes:
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    Sorry 202fan that is not correct, you only do that for ESP:D
     
  8. horgantrevor

    horgantrevor Senior Member

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    I have done that on a w168 but won't work on a w202 the BAS asr unit may need to be replaced
     
  9. turbopete

    turbopete Senior Member

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    Your Mercedes:
    2010 '60' Ford Mondeo 2.0TDCi Zetec (sorry)
    or it could be the humble brake light switch, couldnt it?
     
  10. OP
    workmore

    workmore New Member

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    Your Mercedes:
    w202 1998 1800cc
    bas/asr fault lights on.

    Many thanks, funny you should mention washing the engine because this is exactly what i did last summer. i have a contining problem with leaves getting into the engine bay particularly near the wing/skuttle corners & decomposting. so i put the pressure washer in to clean it all away but it is difficult to keep water out of all the electrics.So i will remove the unit & test it .Many thanks once again.
     
  11. spock500

    spock500 Senior Member

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    Your Mercedes:
    300TD, 1998
    On both my W202 and W210 I had to bleed the brakes with the engine running then depressing the brake. This way it gets rid of any air trapped inside the ABS unit.

    Before, the brake peddle had a very odd feel to it, almost unresponsive but worked 100%.
     
    Last edited: Nov 26, 2012
  12. REMEmechanic

    REMEmechanic New Member

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    Your Mercedes:
    C250td sport estate 1998
    This is generally an intermitant problem, think simple, clean the rings/sensor up first, rust and clogged debris deposits from poor road conditions when the weather is bad usually cause it.
     

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