Brake Fluid Leak at Bottom of ABS

[Heineken]

When checking my garage today I noticed suspicious marks on the concrete floor.
As the front right of the NSX is free of the typical fluids found in front engine cars (like oil, power steering fluid and the like) the first thing I checked was the ABS brake fluid level.
It was near the 'low' mark even though I remembered it to be at 'full' mark about a year ago ..

The brake fluid at the master cylinder was perfectly fine, though.

Looking under the car, the drops on the floor were exactly below the lower mounting bracket of the ABS unit and the bracket was wet:



Before trying to disassemble everything I wanted to ask if it might be a familiar issue as it strikes me a little odd as of where the bracket is wet (all up to the mounting bolts) and that it seem to have no effect whatsoever on the master cylinder fluid level.

PS: The ABS was not exercised recently but could it be an overflow-during-pump-run issue?

[goldnsx]

overflow-during-pump-run issue?

More sort of a "overflow while not using the car or a stuck solenoid or debris around the gasket. Quite common on older cars but certainly not funny.

[Heineken]

So you're suspecting a not-sufficiently-closing valve probably in team with foamed up brake fluid in the pressure chamber?
I'm currently pondering what to do about it. The reservoir was topped-up of course and I'll probably clean the area with brake cleaner. Additionally I could replace the brake fluid and exercise the pump and valves manually and hope that it clears things up .. I'm not expecting too much from that ABS anyway as long as it stops leaking on parts and the floor :-)

[goldnsx]

Yes, that's the way to go. Exercising all solenoids and hoping that you get as much junk out of the system as possible. There's somehow a description somewhere but I can't help you as I went with the newer pump anyway.

Some people have taken the unit completely apart. Some went with the later pump, much better anyway.

[Heineken]

Well, looks like another busy weekend

PS: Finding the descriptions should be no problem, I remember at least one PDF for a rebuild and several videos on how to flush it manually.

[britlude]

the ABS system is completely separate from the rest of the braking system, save for 4 pistons controlled by the solenoids.... that's why the ABS system fluid can be completely drained without affecting the main brake fluid reservoir.....

[goldnsx]

BTW what happened to the German forum?