[s-cars] Brakes-S6, soft and spongy.. LONG

[Jack Gagnon]

Jeff,

I think Fred's analysis is correct.  The long travel problem will probably
go away when the rear calipers come back into adjustment.

I have had several problems with the bomb not charging properly in the past.
The first time it happened it was extremely cold (-20) and the thing would
not charge.  I was able to get the bomb to recharge after repeated and
almost violent application of the brake pedal while the car was running.  I
suspected there was either a bit of water (ice)or crud in the system that
interfered with the check valve on the bomb.  The car had close to 200K on
it and I was not comfortable with this happening so I replaced the bomb and
did a good flushing of the system. Everything was good for about six months.
Then it happened again!  I did the pedal trick again and every thing was
fine again.  I figured there must have been some crud in the system that
messed up the check valve again.  Since that time I had the rack replaced
and the shop installed the filter that came with the rack and I am hoping
the filter will clean out any other crap that might be in there.  No more
issues for about six months now.

You might be able to get it back into service again without new parts and
disassembly by using the e-brake to adjust the rear calipers and repeated
application of the brake pedal.

If it does come back after doing this, I wouls suggest a flushing of the
system.


Jack

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Postupack, Jeff
Sent: Sunday, April 23, 2006 8:49 AM
To: Taka Mizutani
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Brakes-S6, soft and spongy.. LONG


Thanks for the reply Taka!
"I've changed my rear brakes twice and I've never had to crack a bleeder
in order to get
the pistons to retract."
I thought it was unusual to crack open the bleeder as well for piston
retraction.
Perhaps my caliper piston tool was inadequate, a scissor type device
with a ratchet to rotate the piston.
Perhaps I didn't use enough force to push the piston back inside.

I pressure bled this system twice. I use clear tubing at the bleeder so
I  can inspect for bubbles.
TO the best of my knowledge there is no air in that system.

I think it's the Bomb, after reading Fred Munro's reply.
Jeff



________________________________

	From: Taka Mizutani [mailto:t44tqtro at gmail.com]
	Sent: Saturday, April 22, 2006 12:50 PM
	To: Postupack, Jeff
	Cc: s-car-list at audifans.com
	Subject: Re: [s-cars] Brakes-S6, soft and spongy.. LONG


	Jeff-
	I've changed my rear brakes twice and I've never had to crack a
bleeder in order to get
	the pistons to retract.

	I would not have cracked the system to change the pads and would
have definitely started
	the car and pumped the brakes to get the rear calipers to adjust
before doing a full system bleed.

	Did you get clean fluid both times you bled the brakes? No
bubbles?

	I would keep bleeding- I've had to bleed the full system twice
to get a firm pedal- the ABS
	pump makes things difficult.

	Was this a pressure bleed system or a vacuum bleed?

	Taka


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