Really bad sound from the ABS? unit

S

Sire

Guest
Have a look and listen.

http://www.youtube.com/watch?v=0OUX03RO6MI

Just before I shot the video I bled the system and replaced it with brand new brake fluid. I was hoping it would go away, but as you can hear it didn't. I've heard this sound occasionally before, but could never figure out where it came from. But when I changed the sparkplugs a couple of days ago I heard the sound and could easily pinpoint it.

I suppose this is VERY expensive part to replace :(
Or is it something you could repair yourself?

Help would be VERY appreciated.

Cheers
Glenn from Sweden
 
As above, this happened to a friend with a Honda after he bled the brakes and let the build in the reservoir run low, this in turn allowed air into the abs system., he left his.like this for.a.while and eventually the abs light came on and the unit was damaged beyond repair

The sound you hear is the abs valves gasping in the air pockets and snapping on and off. . . Being brake abs related I would personally take it to a specialist to get it sorted and fully checked

. ., . But that's just me
 
Thank you guys for responding!

What will happen when I pressurise it? I mean technically?

Should the engine be running when I do this?
 
You pressurise it with a bleeding system which screws onto the cap of the resevoir.

You then use vagcom to do a series of cycles on the abs unit which opens and shuts the valves etc.

As the unit is cycled it tells you to open and close the front brake bleed screws, and the pressure forces new fluid through the abs unit and out of the brakes, taking air with it.

John
 
So I need to buy tools for that.

Where can I buy the bleeding system and vagcom?
Can I use a universal bleeding system, or do I need a special system?
 
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You can get a bleed system off ebay and if you go to the ross-tech website it will tell you who your local vagcom supplier is. If you dont plan on using vagcom regularly though i would just take the car to a specialist because the cost will be prohibitive.
 
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You can buy a system made by Gunson called Eezibleed, I have seen them in Halfords for about £20 and Screwfix (product number 33881) sell them for about £17 you use the air pressure from your tyres it has a seperate bottle for extra brake fluid it connects to the valve on your tyre like a foot pump and uses a cap that fits to the top of brake fluid resevior, it does work.
But to be honest if you are not very hands on take it to specialist!!
 
Thank you all for your answers! You are very helpful :)

Well, I changed the cam belt myself so I guess i'm handy enough:p (with some advises from the forum)

But let me get this straight. The pressure is applied only when you bleeding the system? Is that correct?

I first got the impression that the system should be pressurized at all time. (like some coolant systems?)

I bled the system with the engine and ignition turned off. What would happend if I turned the ignition/engine on and bled it again? Wouldn't the pump help getting the air out?
 
Most workshops use a 'one man' brake bleeder kit which pressurises the brake fluid so you just open the bleed nipples in turn, drain off the required ammount of fluid then tightrn the nipples back up. None of the ususal pedal pumping is required.
As stated above, the DIY kits mostly use air pressure from a spare tyre to pressurise the system. If the tyre pressure is over 2 bar then the ABS valves will open and you need to go through the routine with VagCom. Even worse, if the tyre pressure drops below the 2 bar threshold, I suspect you can't fully bleed the ABS pump.
For a routine fluid change all that is needed is to keep the reservoir topped up and start with less than 2 bar in the car tyre

Cheers Spike
 
Sire said:
Thank you all for your answers! You are very helpful :)

Well, I changed the cam belt myself so I guess i'm handy enough:p (with some advises from the forum)

But let me get this straight. The pressure is applied only when you bleeding the system? Is that correct?

I first got the impression that the system should be pressurized at all time. (like some coolant systems?)

I bled the system with the engine and ignition turned off. What would happend if I turned the ignition/engine on and bled it again? Wouldn't the pump help getting the air out?
Click to expand...

Yes the pressure is applied when you are bleeding the system with the Gunson Eezibleed while it is connected to pressure source (I have connected mine to a regulator so I can use it with a compressor, but be carefull with pressure settings, it does explane pressure settings in the Eezibleed instructions).
I dont know what will happen if you have the engine running/ignition on as I bled mine with out the engine running/ignition off and with out touching the brake pedal. But I must add that I have never had a problem like you have with noise coming from the Brake system.
I also use a non return bleed pipe that fits onto the brake bleed nipple.
Have a look at this -
http://www.alcester-racing-sevens.com/brake_bleeding.htm
 
Ok, I found a "one man kit" here in Sweden. But it has no bottle. Only the cap and a hose that you connect to a tire.
 
SteveandClair:

Haha, that's ok. I'll take that as a good sign.
(that you understand my writing:p)
 
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