RE: Procedure for replacing brake bomb in 86 TQ5k

["Paul Meyers" <paulm@viewsoft.com>]

Say, ever ask yourself why this procedure isn't in the Bentley? I have.
You can have the shop do it, but, of all the Audi fixes, this is one of the
easiest. I replaced mine myself with a "recharged" unit, made from a
"discharged" bomb by drilling and tapping it for a gas fitting. I didn't do
that part, it was done by a friend. The unit was recharged to 1150 psi of
nitrogen at a local industrial hydraulic shop. I paid my friend $100 for the
recharged unit plus the trade-in of my old one.

You R&R the bomb as follows:

1. Make sure all the hydraulic pressure is relieved from the bomb (it likely
already is, else why would you be replacing the darn thing in the first
place) by pumping the brake pedal until it gets "hard". You'll know.
2. Clamp the supply hose coming from the bottom of the Pentosin reservoir.
Otherwise, you get a warm hydraulic fluid shower when the hose comes off the
back of the bomb.
3. Remove the Bando bolt with a 17 mm wrench. Be sure to keep track of the 2
copper washers, one on either side of the hose fitting (one between the bolt
and the fitting, one between the fitting and the bomb body). You'll have a
small release of Pentosin, but it's not worth trapping to reuse it. Clean
the bolt and the washers in solvent, being sure to remove any stray grit
that might allow the fitting to leak. There is a little screen in the
orifice of the bolt. Make sure to clean this out while you're here. It's
easy to do with a blast of compressed air. You can use new washers, but,
with care, you can salvage the old ones by "lapping" them with 400 grit
emery paper until any scratches are eliminated.
4. Remove the top hydraulic fitting using an 11 mm wrench. This is a
compression fitting, so there's no "O" ring or other part to lose. There
will be some more leakage here, but not to worry.
5. CAREFULLY remove the supply hose from the rear of the bomb, do you don't
displace your clamp (remember the shower). Usually the clamp bolt is frozen,
and it's usually been put on at the wrong angle. I just pulled the hose off.
Since this is the supply side, it's never under more than atmospheric
pressure, so, if it doesn't leak when you put it on, it probably won't.
6. Now remove the forward mounting bracket by removing the 2 11 mm nuts that
attach them to the body. They're held on with locktite. You'll need a rather
small ratchet, since it's a confined space.
7. With the bracket removed, you simply pull the bomb forward and it slides
out of its rear mount.
8. Remove the plastic spacer and the rubber bushing to use on your
replacement bomb. They just slide off.
9. Make sure that the replacement bomb is clean in all its mating surfaces,
so you don't get inadvertent leaks.
Install the replacement bomb using the reverse of this process. Anybody can
do it in less than 45 minutes.
Hope this helps.
Paul Meyers 87 5KCStq 130K mi 5spd, Silver. Stock + Fuch wheels

-----Original Message-----
From:	owner-quattro@audifans.com [mailto:owner-quattro@audifans.com] On
Behalf Of Kneale Brownson
Sent:	Tuesday, June 15, 1999 1:23 PM
To:	Gerald Penyweit; quattro@audifans.com
Subject:	Re: Procedure for replacing brake bomb in 86 TQ5k

I bought the bomb for my '87 5kcstq through The Parts Connection and took
it, along with a can to Pentosin, to my local dealer.  They charged me
about $50-55, including a couple bucks for "shop supplies", and I sat in
their waiting room about an hour.  Whole deal cost me under $300.  The
dealer's estimated fee was about $700, as was the estimate from the busiest
independent near by.

Kneale Brownson


At 09:22 AM 6/15/99 -0700, Gerald Penyweit wrote:
>Anyone with a procedure for replacing brake bomb on a 1986 Audi 5KTQ?
>
>Thanks
>
>
>_______________________________________________________________
>Get Free Email and Do More On The Web. Visit http://www.msn.com