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A-Class brake shoes

Discussion in 'Suspension, Steering & Brakes' started by Helmet Vonthrob, Dec 29, 2012.

  1. Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Your Mercedes:
    A-Class, various: 160/170
    Firstly, a warning...

    For the second time of asking I've had a brake shoe lining detach from the backplate, the 1st was my partner's '99 A160 about 2 years ago and the second is this morning with her '02 A170.

    The same shoe in both cases, the rear shoe on the o/s.

    The symptoms are the same in both cases, the handbrake goes really tight and you struggle to pull it up.

    In the current situation the outcome was different from before; rather than just falling to the bottom of the drum, the lining rotated to the top slashing the boots on the brake cylinder!

    So I've got a new cylinder and shoes but last time I struggled to assemble everything in situ. so can anyone tell me how easy to remove the backplate assembly complete and do everything on my kitchen table (with paper down of course!)??

    Thanks in advance for any tips.
     
  2. area51

    area51 Senior Member

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    Your Mercedes:
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  3. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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  4. television

    television Always remembered RIP

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    Your Mercedes:
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    Nope and not possible, I will check to see how easy it is to remove

    [​IMG]
     
  5. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Wrong diag. I've got drum brakes.
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
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    Please look bottom right and you will see it is correct
     
  7. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Your Mercedes:
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    Bottom right is of the brake disc & the handbrake shoes. My car does not have discs.
     
  8. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Your Mercedes:
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    Anyone got a torque value for the hub nut?
     
  9. television

    television Always remembered RIP

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    Ever thought of a please or thank you
     
  10. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Thanks for asking, yes I have!

    Have you ever thought I might have followed up the request when answered with a 'thanks <insert name of user supplying info as appropriate>'.??
     
  11. television

    television Always remembered RIP

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    I know know that you have a 168 and not a 169,,, I do not know that A class very well, I was just trying to help you out so I will pass now on this thread.
     
  12. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    And I'll consider myself suitably chastised.....:shock:
     
  13. television

    television Always remembered RIP

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    [​IMG]

    ......................................................
    [​IMG]
     
  14. area51

    area51 Senior Member

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    Your Mercedes:
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    From the Haynes manual: Hub to stub axle 170Nm/ 125 lbft
     
  15. grober

    grober Senior Member

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    Driving with the handbrake partially on--- can "cook" the linings and if they are bonded rather than riveted on then this can cause premature failure. This can be caused by seized brake cables or mechanism OR by someone forgetting to let the handbrake off???
     
    Last edited: Dec 30, 2012
  16. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Good call, I do usually run the adjustment on the tight side but there is always clearance.

    I doubt my partner has run with the handbrake on, the dashboard bleeps quite insistently.

    Update: one side done! - and I'm completely hacked off!

    Looks like the backplate was bent so the cylinder was not square, the cylinder was completely seized.

    The phrase 'remove the hub' would be better expressed as - get a puller 'cos you've got NO chance of it coming off without one! So down to Screwfix; £17.99, bargain!

    Will get on the other side tomorrow as long as the torrential rain & gales stay away!

    Thanks Area51 for the torque setting, funnily enough the nut went back exactly were it came from.
     
  17. area51

    area51 Senior Member

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    Any thoughts as to how the backplate became bent??

    I hope you are replacing the wheel cylinder on the other side too..

    Any chance of a link for the puller that you bought, please? I may well need one for my car at some point.
     
  18. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    Answers in the order of the questions..

    Previous owner? I replaced the WC almost a year ago and noticed the shoe end was not in the centre of the cylinder and it was at an angle but it just didn't register at the time.

    Possibly! - will check the condition when I open everything up. :x

    http://www.screwfix.com/p/laser-rev...tracking url&gclid=CIfDgrL9wrQCFe7MtAodpy4Agg

    Easy now I know what I'm doing, I took the backplate off completely but think next time will do in situ.
     
  19. area51

    area51 Senior Member

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    Just a thought, did the cylinder only have one securing bolt? I am sure that I read somewhere (WIS??) that new cylinders should be fitted using two bolts.

    I've seen this happen quite a few times; one wheel cylinder replaced because it is seized or leaking, the other cylinder looks ok so doesn't get replaced. A very short time after this the cylinder that seemed ok is now leaking fluid all over the recently replaced brake shoes. Just my two pence worth...

    Many thanks for the link, I may well need one of those in the future.

    I hope that replacing the other side goes ok.
     
  20. OP
    Helmet Vonthrob

    Helmet Vonthrob Senior Member

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    2 bolts holding the cylinder so no prob (I hope).

    The seized cylinder was less than a year old but had lost its boot but I will give the old cylinder on the other side a good once over.

    It's pouring with rain outside at the moment and since the street is my workshop, the other side will be on hold!
     

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