Hydraulic pump cap tool

[Kneale Brownson]

I wouldn't blame the bomb for pump problems.  I think the check valve is only
there to help the accumulator hold its pressure when the engine isn't turning
the pump.

Was the ebay pump supposedly "rebuilt" or just a "good" takeoff?  I wouldn't
trust ebay pumps unless they come with validation that ZF rebuilt them.  

If you buy the seals kit referenced earlier, do the whole pump, not just the
seals under the caps.  I'll bet that when you take the caps off you'll find the
seals inside much harder than the ones from a new kit.  Best writeup I've seen
on pump resealing is in the Bentley for 89-91 100/200.


At 07:21 PM 11/19/2006 -0500, Ameer Antar wrote: 

>
> Thanks for the tip to everyone who replied. I guess I'll have to change the
> seals too, even though the pump's only a few months old (bought it from
> ebay). I had a brake accumulator (bomb) with a bad check valve (one of those
> rebuilt ones). I'm not sure, but my guess is the leaky valve forced fluid
> back into the pump, instead of the brake servo, and may have busted the
> seals. Should I be worried about anything else? 
>  
> I'll never buy one of those rebuilt bombs again. There's nothing in there
> that can be rebuilt if you can't replace the diaphragm. Too bad I didn't
> realize that before the bomb blew up my new pump! Live and learn I guess...
>