Advice on Bi-Passing leaking ABS

[vrg3]

Hmm, in that case I think you should be able to use any unit that came out of a 1993 or 1994 Legacy with an automatic.

If I have my facts straight, there were three types of ABS hydraulic units used:

Bosch:

Four pipes in a square coming off the top, no bleeder valves, relay box on passenger side. Used on some 90-91 cars. Part number 26771AA000.

Regular Nippon:

Four pipes in a square coming off the top, two going into pipes on the passenger side, two bleeder valves on top, relay box on driver side. Used on the rest of the 90-91 cars, all 92 cars, and all 93-94 manual transmission cars. Part number 26730AA001.

Nippon 2E:

Four pipes in a line coming off the top, no bleeder valves, relay box on passenger side. Used on all 93-94 automatic cars. Part number 26731AA200.

[THAWA]

has the middle one

[ciper]

The middle one "Regular Nippon" is the most sexy.

[vrg3]

ciper - Something about it having a pair of nipples perhaps?

I agree that I prefer the regular Nippon one, because of those bleeder nipples.

[NuwanD]

i've got the nippon unit as well and it has been leaking since last year... only leaks when the weather is warm so i've been ok through the winter but it just started up again this week... gotta keep topping it up every 3 weeks or so

for me it is leaking from a large 19mm? (don't remember) bolt on the front end of the unit, i'm afraid to pull the bolt out and clean up the rust behind it (causing the leak) since i don't know what the bolt is for.... just gonna toss the entire unit when i get a chance since i have the abs always turned off

[ciper]

How about sanding the area, using carb cleaner on it then covering it with a mountain of JB weld?

[NuwanD]

The rust between the bolt and the abd unit body isn't sandable unless i remove the bolt, so that is the only option....

But that doesn't matter anymore, another joint on the unit just started leaking... not so much leaking, more like a geyser everytime I pump the brakes... now the car is undriveable as the pedal basically drops to the floor

cheers to my ever growing hate of ABS

[kev-k]

ive got a 1995 legacy with the bosch 2e abs unit
its leaking out a hole in the unit toward the bottom
it looks like it might be a relief hole or something
can anyone help me with this?

[vrg3]

I wouldn't recommend trying to repair the hydraulic unit... It's a pretty complex piece of machinery, and lives depend on it functioning as it's meant to.

I think you'll have to replace it or bypass it.

According to the collision repair guides, if your 95 doesn't have traction control and was manufactured before October 1995, you can use a 2E unit from a first-generation Legacy.

[kev-k]

can anyone help me on installing procedures
for bosch 2e abs pump
i just puchased one to replace my leeking one never did this before

[vrg3]

It should be pretty straightforward. Something like:

1) Disconnect negative battery terminal.
2) Disconnect hydraulic unit's electrical connectors.
3) Undo the six brake line connections using a 10mm flare-nut wrench.
4) Unbolt the mounting brackets.
5) Installation is the reverse of removal.
6) Bleed the whole brake system thoroughly.

It might be good to use a vacuum bleeder to suck all the fluid out of the system so you're not pouring caustic brake fluid all over your wheel apron, and so you start with fresh fluid afterwards.

Be really careful with the inverted flare pressure fittings. Any grit at all in the joint can make the whole fitting useless. So make sure the threads and the flare seats (on both sides) are completely clean. Don't overtorque them when reinstalling them; the torque spec is something like 13 ft-lbs.

You might end up having to get a dealer to do the final bleeding if there are any hidden passages in the hydraulic unit that don't already have brake fluid in them. But given that you're installing a used one that shouldn't be a problem. You probably will want to bleed the system again after engaging ABS a few times, though.

[kev-k]

if anyone could tell me it would be appreciated
im replacing a bosch 2 abs unit
i need to know if this unit requires cycling
with a service tool or not looked online
not much available on it
thanks