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ABS Brake Fluid Flush 

 

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 Post subject: ABS Brake Fluid Flush
Posted: Sun Jan 22, 2006 8:32 pm 
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Quick one...
What's the proper procedure to completley flush the brake fluid when your car is equippied with ABS.
I've bled my brakes a few times, but obviously there's going to be some of the crap still left in the ABS system.
Cheers.

 

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Posted: Sun Jan 22, 2006 9:27 pm 
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same as normal

to flush/bleed brakes on a abs car is no different to a non abs car :)

to flush remove around 80% of fluid from the master cylider resevoir. then start bleeding brakes

from the passenger side right wheel first
then drivers side rear, drivers side front then finally passenger side front.

keep bleeding untill the new fluid comes through
and make sure u dont let the fluid level get to low

piss easy

 

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Posted: Sun Jan 22, 2006 9:43 pm 
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check a workshop manual if it has a bleeding sequence because when you bleed the system the pedal feels spoungy if it isnt the correct sequence

 

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Posted: Sun Jan 22, 2006 10:02 pm 
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Frank, that's how I do do it lol.
But I don't see how the fluid in the ABS system is being removed :roll:

 

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Posted: Sun Jan 22, 2006 10:07 pm 
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voxace wrote:
Frank, that's how I do do it lol.
But I don't see how the fluid in the ABS system is being removed :roll:


ummm for brakes to work the fluid goes
abs cars master cylinder --> abs unit ---> brake calipers

non abs cars master cylinder ---> brake calipers



Quote:
check a workshop manual if it has a bleeding sequence because when you bleed the system the pedal feels spoungy if it isnt the correct sequence


the pedal will feel spongy if there is air in the sytem not the bleeding sequence

 

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Posted: Sun Jan 22, 2006 10:10 pm 
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we had a car come into work we did front and rear brakes changed brake fluid no brakes kept trying read the book did the specified bleed sequence brakes worked so it does matter on most cars

 

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Posted: Sun Jan 22, 2006 10:17 pm 
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I thought that the ABS unit had it's own internal resovoir that is opened when the ABS is used.

IE, most of the time brake fluid bypasses it, until the ABS kicks in and the old stuff mixes in with the rest.

Not sure though....

 

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Posted: Mon Jan 23, 2006 10:13 am 
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voxace wrote:
I thought that the ABS unit had it's own internal resovoir that is opened when the ABS is used.

IE, most of the time brake fluid bypasses it, until the ABS kicks in and the old stuff mixes in with the rest.

Not sure though....


I don't know where you could get that idea, my understanding is the ABS control unit cuts the pressure/flow to the locking wheel/s as determined by the sensors, I don't see it needing a seperate reservoir, I could be wrong, just my limited understanding of the system.

 

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Posted: Mon Jan 23, 2006 11:39 am 
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Put simply the ABS unit is just a set of valves inbetween your normal resovoir and the brake caliper. If you put new fluid in the top and bleed the system until that fluid comes out at each wheel, you will have fresh fluid throughout your entire brake system.

 

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Posted: Mon Jan 23, 2006 11:40 am 
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voxace wrote:
I thought that the ABS unit had it's own internal resovoir that is opened when the ABS is used.

IE, most of the time brake fluid bypasses it, until the ABS kicks in and the old stuff mixes in with the rest.

Not sure though....


no man

the abs unit is inline with the brake lines from the master cylinder
so with normal braking the fluid under pressure is pushed through the abs unit.

it does not have a separte resivoir

 

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Posted: Mon Jan 23, 2006 12:20 pm 
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Ahh that's cool then, just got the idea from some crap I was readin on some websites.

 

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Posted: Mon Jan 23, 2006 2:44 pm 
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The only time you will have trouble is if you ever remove the abs unit, or allow air to get into it by removing a line from it etc.
It is nearly impossible to get the air out of the accumulator without specialised test equipment that will operate the solenoids.

 

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Posted: Mon Jan 23, 2006 2:51 pm 
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smally351 wrote:
The only time you will have trouble is if you ever remove the abs unit, or allow air to get into it by removing a line from it etc.
It is nearly impossible to get the air out of the accumulator without specialised test equipment that will operate the solenoids.



I had plenty of air in mine - it got couriered over from vic to perth :wink: and just flushing it through like Frank and I have described above will get all the air out!!!

 

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Posted: Mon Jan 23, 2006 3:34 pm 
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voxace wrote:
Ahh that's cool then, just got the idea from some crap I was readin on some websites.


You don't believe everything you read on websites do you?? :wink:

 

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Posted: Mon Jan 23, 2006 5:30 pm 
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Not this one lol. J/K.
I think the general idea I got was it depends on the system.
My EB has a Bendix system in it, dunno what EF/EL/AU had??? Did they have Bosch units by then?

But anyways, I have been bleeding it as per normal, and will continue to do it this way. Cheers.

 

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