Brakes grinding noise

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by clk320x, Mar 19, 2017.

  1. clk320x

    clk320x MB Club Veteran

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    My brakes are making a loud grinding noise when I brake at low speeds to a stop, such as when manoeuvring around my parking area.

    I have had my rear brake pads replaced before, and I was told at the time the fronts had around 40% left, so I assume they have worn out now...

    ECP have a good offer going on at the moment, and I have been looking at the brake pads, they seem to be going for aroundn £45 for ATE pads, and £68 for ATE Ceramic pads...

    I hear that ATE is the mercedes OEM pads? Do merc use the same supplier? As I dont want to skimp on the brakes.

    Brembo pads are cheaper, are Brembos not supposed to be superior?

    Cheers
    Abs
     
  2. MancMike

    MancMike New Member

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    I have the brembo pads. Have noticed no difference whatsoever compared to the Mercedes ones.

    The grinding noise is likely the pad backing plate touching the disk. If you're not careful it could ruin the disk and worse, be fired out and you'll lose brakes totally as there's a lot of slack before the piston touches the disk. I had this happen in my RX8 on the way back from ECP with new brakes in the boot!
     
  3. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Hi Mike, thanks for the reply. I have a quote of £115 from PCS ages ago for the front pads with parts, labour, vat which I was happy with...

    They are a bit far however, anyone know how much labour is likely to be charged by an indie for replacing these if I provided the pads?

    Are the ATE ones the genuine merc ones then?

    Cheers
    Abs
     
  4. OP
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    clk320x

    clk320x MB Club Veteran

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    Also I have no brake pad light on the dash, I assume previous owner didnt fit the sensor when he changed the pads? As surely it must have had brake pad sensor fitted from factory?

    Cheers
     
  5. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Contacted Terry @ Wayne Gates, I know he will help me out, highly recommended to everyone.
     
  6. daveenty

    daveenty Hardcore MB Enthusiast

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    Yes, they have a sensor both front and rear.

    If it wasn't fitted, you would a constant warning light unless it has been by-passed in the wiring.
     
  7. MancMike

    MancMike New Member

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    There's a sensor front and rear, but usually only one per side, figuring that both sides will wear roughly evenly.

    I'm not sure that's right about the sensor. They only have two wires, and how it works is, when the pad wears right down, the sensor meets the disk and that wears the plastic of the sensor away. At some point, two metal prongs inside the sensor touch the disk, making a circuit and the car knows the pads are down.

    I can only think that not having fitted the sensor would be the same as a non-triggered sensor. The car just doesn't get any continuity through the sensor and it appears it's not been tripped.

    Only speculation though.

    No idea on cost I've never paid for brakes to be replaced, it's a quick driveway job providing you've got a socket set.
     
  8. optimusprime

    optimusprime Hardcore MB Enthusiast

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    disc

    CLK dont keep driving it as this will happen . But i dont think you will.This chap said his was grinding for some time . lol
     
    Last edited: Apr 7, 2017
  9. OP
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    clk320x

    clk320x MB Club Veteran

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    Oh my gosh! Tbh I just checked the fronts they look fine just tiny grinding noise when coming to a stop. Will get pads swapped this Thursday.
     
  10. OP
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    clk320x

    clk320x MB Club Veteran

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    Yeh I think what your saying sounds about right, although I had the rears changed at PCS and I reckon they'd have told me so I guess there won't be on in rears? Or they just fitted it?

    Will see what terry says
     
  11. markjay

    markjay MB Club Veteran

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    Some cars do not have a sensor on the rear pads, just the front. This needs to be checked against the specific make and model.
     
  12. shadenfroh

    shadenfroh Active Member

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    You can very clearly see if your pads & discs are worn well before it goes to the point of the photo above :D

    Is this the noise that you experience when the car is moving really really slow, for example just before you stop at a traffic light? Does it get better as the brakes warm up? If so - that's absolutely normal. Can you make a quick video?

    As for brand - both Brembo and ATE are top quality. I use ATE, because they're soft, gentle on the rotors, very quiet and comfortable. I don't really care if they wear out a tad faster or if I have to wash the wheels more often. I believe that if you want to go with ceramic pads, you also need ceramic rotors. And then there's the small issue that you'll need to brake harder before they reach a certain temperature and start to perform to their full potential. That's a deal breaker for me, because I want the most predictable and safe vehicle.
     
    Last edited: Mar 22, 2017
  13. Steveml63

    Steveml63 Hardcore MB Enthusiast

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    Hi,
    Our rear pads were changed on Saturday. Brakes were really squeaking for the past few weeks.
    Rear has brake wear sensor on right hand side - these pads were fine but the near side started grinding just as I arrived at the garage!

    IMG_3008.jpg
    Discs were refaced and new pads and sensor were fitted!
    Nearside must have been binding - as pads had only lasted 8000km!

    Cheers
    Steve
     
  14. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    They make a slight grinding noise just as the car has come to a stop, sometimes it happens sometimes it doesn't... I was told around 5-6,000 miles ago the front pads were 50% worn. Does 5-6k sound about right?
     
  15. shadenfroh

    shadenfroh Active Member

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    They should still have some life left, but it depends on your driving style.
     
  16. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Pads changed today at Wayne Gates and problem sorted, service was excellent as always. Highly recommend Terry for any work you need on your Merc :)

    Cheers
     
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