Whenever I start the car and pull away for the first time there is a
horrible loud noise which sounds like metal scraping against metal.  I
first thought it was coming from the driveshaft or suspension area but
have know pinpointed it to the ABS module (the lump that is bolted to
the bulkhead) as temporarily disconnecting the ABS the noise disappears.
The handbook says that once the car is started the ABS does a self-test
initialisation when the vehicle reaches 3 mph and you may hear a slight
mechanical sound during this test.  Well it's a heck of a lot louder
than a "slight" mechanical sound!!

When I start the engine the ABS light will come on and go out after 3 
secs as it should, but if I pull away fast the ABS light will sometimes 
come back on and remain lit - but if I pull away gently (or press the 
brake before moving the vehicle) the ABS light will remain out as it 
should.  Does it sound like the module is on its way out?

"Mark"  wrote in message 
news:3jkmjeFqgu21U1@individual.net...

> Whenever I start the car and pull away for the first time there is a
> horrible loud noise which sounds like metal scraping against metal.  I
> first thought it was coming from the driveshaft or suspension area but
> have know pinpointed it to the ABS module (the lump that is bolted to
> the bulkhead) as temporarily disconnecting the ABS the noise disappears.
> The handbook says that once the car is started the ABS does a self-test
> initialisation when the vehicle reaches 3 mph and you may hear a slight
> mechanical sound during this test.  Well it's a heck of a lot louder
> than a "slight" mechanical sound!!
>
> When I start the engine the ABS light will come on and go out after 3 secs 
> as it should, but if I pull away fast the ABS light will sometimes come 
> back on and remain lit - but if I pull away gently (or press the brake 
> before moving the vehicle) the ABS light will remain out as it should. 
> Does it sound like the module is on its way out?
>


No, it sounds like you have worn out disc pads.

mrcheerful

"mrcheerful ."  wrote in message

> No, it sounds like you have worn out disc pads.


Pads & shoes are in good condition and the brakes work excellent.  The 
noise is coming from the ABS module during the self-test initialisation 
period when the vehicle reaches 3 mph  - not when the brakes are 
pressed.

"Mark"  wrote in message 
news:3jktjgFql31vU1@individual.net...

> "mrcheerful ."  wrote in message
>> No, it sounds like you have worn out disc pads.
>
> Pads & shoes are in good condition and the brakes work excellent.  The 
> noise is coming from the ABS module during the self-test initialisation 
> period when the vehicle reaches 3 mph  - not when the brakes are pressed.


A make and model might help.

Ta,
G.

"G-Man"  wrote in message
news:PQbBe.68993$G8.40851@text.news.blueyonder.co.uk...

>
> "Mark"  wrote in message
> news:3jktjgFql31vU1@individual.net...
>> "mrcheerful ."  wrote in message
>>> No, it sounds like you have worn out disc pads.
>>
>> Pads & shoes are in good condition and the brakes work excellent.
>> The noise is coming from the ABS module during the self-test
>> initialisation period when the vehicle reaches 3 mph  - not when the
>> brakes are pressed.
>
> A make and model might help.

Daewoo Lanos.

I'm only familiar with Mercedes ABS. If the system needs to be bled, the 
pump can be noisy. Otherwise the pump is probably on the way out.

John


"Mark"  wrote in message 
news:3jkmjeFqgu21U1@individual.net...

> Whenever I start the car and pull away for the first time there is a
> horrible loud noise which sounds like metal scraping against metal.  I
> first thought it was coming from the driveshaft or suspension area but
> have know pinpointed it to the ABS module (the lump that is bolted to
> the bulkhead) as temporarily disconnecting the ABS the noise disappears.
> The handbook says that once the car is started the ABS does a self-test
> initialisation when the vehicle reaches 3 mph and you may hear a slight
> mechanical sound during this test.  Well it's a heck of a lot louder
> than a "slight" mechanical sound!!
>
> When I start the engine the ABS light will come on and go out after 3 secs 
> as it should, but if I pull away fast the ABS light will sometimes come 
> back on and remain lit - but if I pull away gently (or press the brake 
> before moving the vehicle) the ABS light will remain out as it should. 
> Does it sound like the module is on its way out?
> 

"John"  wrote in message 
news:db4676$eav$2@reader01.news.esat.net...

> I'm only familiar with Mercedes ABS. If the system needs to be bled, 
> the pump can be noisy. Otherwise the pump is probably on the way out.
>
> John


Thanks John, will try a system bleed first.