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Brakes Engaging in Reverse Gear (C180 W202 - 1996)

Discussion in 'Suspension, Steering & Brakes' started by davidduk, Mar 13, 2019.

  1. davidduk

    davidduk Member

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    Hi everyone - A newbie to this forum here. Hoping someone may be able to help me?

    12 months ago my C180 W202 (1996) automatic gearbox developed a fault. When I tried to reverse the vehicle the brakes engaged partially. I was still able to reverse but obviously with the brakes partially engaged it was a struggle and needed lots more throttle. If I shifted into neutral with the engine running I could push the car backwards without a problem.

    It was decided at the time that it was a problem associated with the parking brake and simply loosening the parking brake cable solved the problem. For the past 12 months everything has been fine, that is until a few days ago when the problem returned. Unfortunately this time the same remedy hasn't worked. We've had the brakes apart but we haven't been able to identify the problem.

    Has anyone here experienced this problem before and if so were you able to remedy it? Any ideas/suggestions would be gratefully appreciated. Thank you!
     
    Last edited: Mar 13, 2019
  2. LostKiwi

    LostKiwi Senior Member

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    Pretty much has to be parking brake related. There's nothing else than can have that effect. Make sure all cables and linkages are free moving and shoes correctly fitted.
     
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  3. Blobcat

    Blobcat Moderator

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    Hello and welcome

    All I can think of is the parking brake pads are getting dislodged in reverse and jamming. If you jacknit up can you spin the rear wheel backwards?
     
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  4. noonboots

    noonboots Senior Member

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    I would fit new shoes and a new set of springs then make sure they are properly adjusted.. Knock the cable adjustment right back, adjust up the new shoes then readjust the cable. If the problem persists change the discs and pads and start again.
     
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  5. OP
    davidduk

    davidduk Member

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    Thanks for the above suggestions. Locally someone has suggested it could be a gearbox problem! Could it be?
     
  6. noonboots

    noonboots Senior Member

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    Grasping at at straws but..... You could also check all the rear suspension bushes, including sub frame. If the axle was able to twist under drive in reverse it could possibly pull on the brake cable. Pushing the car backwards would not have the same effect. Slackening it off the cable would have prevented it. As I said, grasping at straws
     
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  7. 00slk

    00slk Senior Member

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    I had a Holden car that did something similar to what You're describing. Was the gearbox trying to engage drive while in reverse mode.
    What you could try is reversing down hill, take it out of reverse gear and see if it still tries to do what you are saying.
    With the Holden it was a replacement gearbox.
     
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  8. OP
    davidduk

    davidduk Member

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    Thank you for your feedback. Yes all is fine when going into neutral and reversing downhill. But from a standstill if I go into reverse gear, as soon I start reversing the brakes usually engage, although sometimes I can reverse freely to begin with but if I then apply the footbrake and then I take my foot off the foot brake again the brakes remain engaged.
     
  9. OP
    davidduk

    davidduk Member

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    Thank you for your reply, much appreciated! Someone locally has suggested to me that it could be a gearbox issue? Do you think that is a possibilty? It does seem strange to me that the exact same problem 12 months ago just required an adjustment of the parking brake cable and this time instead of being a brakes issue they are saying it could be a gearbox issue?
     
  10. OP
    davidduk

    davidduk Member

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    Thank you for your feedback. Much appreciated!
     
  11. OP
    davidduk

    davidduk Member

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    I appreciate your feedback. Thank you! Someone locally has suggested to me that it could be a gearbox issue? Do you think that is a possibilty? It does seem strange to me that the exact same problem 12 months ago just required an adjustment of the parking brake cable and this time instead of being a brakes issue they are saying it could be a gearbox issue?
     
  12. OP
    davidduk

    davidduk Member

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    Hi Thank you for your welcome - I appreciate your reply. Yes wheels spin freely when jacked up. Someone locally has suggested to me that it could be a gearbox issue? Do you think that is a possibilty? It does seem strange to me that the exact same problem 12 months ago just required an adjustment of the parking brake cable and this time instead of being a brakes issue they are saying it could be a gearbox issue?
     
  13. noonboots

    noonboots Senior Member

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    Parking brake cables should never need adjusting after being set up initially. The idea that they stretch is a very old myth. Adjusting the cable merely takes up free play from wear somewhere else. As for the gearbox, as far as I know there is no interaction with the gearbox and the brakes. An internal fault could give the impression of braking I suppose but adjusting the park brake cable wouldn't affect it.
     
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  14. Blobcat

    Blobcat Moderator

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    As above, I can’t see how adjusting parking brake cable could “Fix” a gearbox issue. Not sure if a ‘96 box would have that much electronics in the gearbox that would record a fault. But if it has that “intelligence” then faults will be stored if it is the gearbox, which the Mercedes diagnostic system could interrogate.

    Still think it’s a parking brake issue.
     
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  15. LostKiwi

    LostKiwi Senior Member

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    If it's a 4 speed no electronics.
    If it's a 5 speed it's a 722.6 so standard 722.6 diagnostics will be applicable (Star).

    I seriously doubt it'll be gearbox on the basis of information provided.
     
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  16. OP
    davidduk

    davidduk Member

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    Thank you. Very helpful.
     
  17. OP
    davidduk

    davidduk Member

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    Thank you for your help!
     
  18. OP
    davidduk

    davidduk Member

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    Thank you. Very helpful!
     

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