ABS warning light came on.

Normally, when the lights come on and codes are set, the pump has stopped working. If yours is just leaking, you might be able to just change the o-ring, especially if the pump motor is dry. If the solenoid block is leaking, it would be a different story.

 

The problem I came across was the electric motor portion of the pump stopped working. It seemed to have taken a brake fluid bath from a leaking o-ring. Before removal I smacked it with something and it began to work, as you know this is common with electric motors. Of course I wasn't going to let this car back on the road without replacing the troubled motor. The OP found the leak before the motor failed but it seems jhknight is experiencing a failure. I intend to add some pics of the pump I replaced later on.

 

The brake accumulator booster assembly just started leaking yesterday, no brake warning light yet. 2002 Prius with 163,000 miles. I would like to replace with a used unit and have located a few on eBay - comes with 6 month warranty. Avi - Can you recommend an independent repair shop in the Chicago area who can perform this repair? Thanks much for your sharing of wisdom and knowledge on this forum.

 

Update - I bought a brake booster accumulator assembly from a salvage yard in Oregon, supposedly only 50K miles, no rust, $145.00. Found a local repair shop that has the brake bleeding scanner to install the part for $520.00. Much cheaper than dealer price. Part has been on the car for a week, no problems so far.

Owning a high mileage used Prius is not for the faint of heart. Lots of high tech parts that potentially could cost a lot of money to fix.

 

Added this to the sticky! Great phrase.

Bob Wilson