abs pump worn out?

[reattajack]

does anyone know how these abs teves2 pumps fail?
are there any rubber parts in there?

anyone have a diagram of the actual pump ? not the motor

[ESTAVER]

I don't know how far along in your troubleshooting you have progressed but, I've had the whole pump/motor unit off to replace the seal between the motor and pump. This is a flat rubber seal ring that is prob. not available. I made a new one from heavy auto gasket material. The 1st question is... is the pump running at all? From what I could see of the pump inlet, it looks like a vane type pump. I have worked in Hydraulics for many years and it would be unlikely that the pump it's self has worn enough to not provide the flow and pressure needed to charge the accumulator, due to an always flooded inlet and not that many hours running over the years. Now if the motor drive shaft or metal coupling disk was broken, that could disable the pump, but these are rather sturdy links.
Later, my problems with no brake pressure were due to a bad pressure switch. The pump never came on at low pressure and braking was hard pedal and lot's of effort to slow the girl down. I've posted a description of pulling the pump/motor unit here a few months ago and will add it's link to this thread in a few moments.

[ESTAVER]

Teves service chapter

Here's the forum link to my posting about the ABS pump/motor seal that I mentioned above. Any questions... drop a line to estaver1@bellsouth.net
Text on PAGE 3 of this link.