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From: stryped on 25 May 2010 20:50
I have a 1996 chevy Silverado with a Kelsey-Hayes EBC310 ABS. I am
needing to replace the master cylinder but am afraid I will ot be able
to properly bleed the system because of comments I have read about air
getting into the ABS. Can anyone tell me if this is true?
From: hls on 25 May 2010 21:08

"stryped" <stryped1(a)yahoo.com> wrote in message
news:14b500cb-11dc-4b55-aa87-1251024007a7(a)i31g2000vbt.googlegroups.com...
>I have a 1996 chevy Silverado with a Kelsey-Hayes EBC310 ABS. I am
> needing to replace the master cylinder but am afraid I will ot be able
> to properly bleed the system because of comments I have read about air
> getting into the ABS. Can anyone tell me if this is true?

Oh horseshit, Stryped! Read the book, do the bleed as specified.
This is not rocket science.

From: Tegger on 25 May 2010 21:22
"hls" <hls(a)nospam.nix> wrote in news:toWdnZixTu7l6WHWnZ2dnUVZ_ridnZ2d(a)giganews.com:

>
> "stryped" <stryped1(a)yahoo.com> wrote in message
> news:14b500cb-11dc-4b55-aa87-1251024007a7(a)i31g2000vbt.googlegroups.com...
>>I have a 1996 chevy Silverado with a Kelsey-Hayes EBC310 ABS. I am
>> needing to replace the master cylinder but am afraid I will ot be able
>> to properly bleed the system because of comments I have read about air
>> getting into the ABS. Can anyone tell me if this is true?
>
> Oh horseshit, Stryped! Read the book, do the bleed as specified.
> This is not rocket science.
>
>



I see this at the AZ page on ABS for OP's vehicle:

"Bleeding the EHCU
------------------
"Bleeding the EHCU requires the use of the TECH-1 scanner or its
equivalent and the appropriate cartridge. Additionally, 3 tools,
J-39177 or equivalent, are required. Bleeding cannot be performed
without this equipment.
"The EHCU must be bled after replacement or if air is trapped
within the unit. It must be bled after bleeding the master cylinder
and before bleeding the individual wheel circuits."

There's more, too, here:
<http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Four+Wheel+Anti-lock+Brake+System&partName=Brakes&pageId=0900c1528008f6eb&partId=0900c1528008f65f>

I'm glad I don't have ABS.

--
Tegger
From: Steve W. on 25 May 2010 22:39
stryped wrote:
> I have a 1996 chevy Silverado with a Kelsey-Hayes EBC310 ABS. I am
> needing to replace the master cylinder but am afraid I will ot be able
> to properly bleed the system because of comments I have read about air
> getting into the ABS. Can anyone tell me if this is true?

1996 will need a GOOD scan tool and some clips for the valves to bleed
the ABS unit. A Tech 2 or other high end unit is needed to activate the
bleeding procedure to get the air out IF you get air into it.

BUT there is a way around this, the catch is that you have to pay a LOT
of attention to do it, and it takes about an extra quart of brake fluid.

You start by flushing the system with new fluid. To do this you break
loose one rear bleeder and one front bleeder. Then you use a turkey
baster to remove as much of the old fluid out of the master. Now fill it
with clean fluid and WITH THE ENGINE OFF AND THE KEY OFF! you crack the
front bleeder and let the fluid come out. KEEP THE reservoir FULL as you
do this. Continue until you get clean fluid. Repeat with the rear.

Now for the tricky part. Remove one pad on the front caliper, then
GENTLY you push down the pedal to push out the piston just a SMALL
amount while making sure the master stays full. Now on the back you
remove the drum and gently pump the wheel cylinder full with a clamp
holding the front piston so it cannot move any farther.

Now for the fun part. Bench bleed the new master, then install it and
connect it up. Now GENTLY compress the rear wheel cylinder and the front
piston. This will push new fluid up through the master and any air that
got into the lines below the master. If you do it gently and correctly
you end up not getting air into the ABS and new fluid in the system.

--
Steve W.
(\___/)
(='.'=)
(")_(")
From: stryped on 26 May 2010 08:12
On May 25, 9:39 pm, "Steve W." <csr...(a)NOTyahoo.com> wrote:
> stryped wrote:
> > I have a 1996 chevy Silverado with a Kelsey-Hayes EBC310 ABS. I am
> > needing to replace the master cylinder but am afraid I will ot be able
> > to properly bleed the system because of comments I have read about air
> > getting into the ABS. Can anyone tell me if this is true?
>
> 1996 will need a GOOD scan tool and some clips for the valves to bleed
> the ABS unit. A Tech 2 or other high end unit is needed to activate the
> bleeding procedure to get the air out IF you get air into it.
>
> BUT there is a way around this, the catch is that you have to pay a LOT
> of attention to do it, and it takes about an extra quart of brake fluid.
>
> You start by flushing the system with new fluid. To do this you break
> loose one rear bleeder and one front bleeder. Then you use a turkey
> baster to remove as much of the old fluid out of the master. Now fill it
> with clean fluid and WITH THE ENGINE OFF AND THE KEY OFF! you crack the
> front bleeder and let the fluid come out. KEEP THE reservoir FULL as you
> do this. Continue until you get clean fluid. Repeat with the rear.
>
> Now for the tricky part. Remove one pad on the front caliper, then
> GENTLY you push down the pedal to push out the piston just a SMALL
> amount while making sure the master stays full. Now on the back you
> remove the drum and gently pump the wheel cylinder full with a clamp
> holding the front piston so it cannot move any farther.
>
> Now for the fun part. Bench bleed the new master, then install it and
> connect it up. Now GENTLY compress the rear wheel cylinder and the front
> piston. This will push new fluid up through the master and any air that
> got into the lines below the master. If you do it gently and correctly
> you end up not getting air into the ABS and new fluid in the system.
>
> --
> Steve W.
> (\___/)
> (='.'=)
> (")_(")

Why does my hanes manual in the section on how to replace the master
cylinder not say anythign about bleeding the ABS. Is it possible most
of the time you dont have to?
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