2003 4 Runner ABS Pump Failure

4RunnerGirlGA

New member
Looking for any helpful information regarding our problem...here are the details:

2003 4 Runner Limited V8
235,000 miles
Original owner - purchased new

ABS, TRAC OFF & VSC lights have been illuminated for some time. Car was taken to mechanic months ago and the code read "rear wheel speed sensor" which we were told was not a major issue and not to worry about.

Two days ago while driving the car there was a terrible scraping noise when braking. Decided to take the car to mechanic but before we could get there (within an hour) brake fluid was all over our garage under the rear driver side tire.

Mechanic said we needed brake pads, calipers and rotors and did all repair work. Not sure of the details on this part but they were having problems getting the brakes to "bleed right" and when they contacted us again we were notified that the ABS Pump is stuck in the "on position" and will not stop pumping. This was the cause of all of the fluid leakage. Were told whole ABS system would need to be replaced. This was also the reason for the extreme wear on the brake pads, calipers, rotors.

Mechanic is very trustworthy and fair and we have been using him for a long time. He said he has never run into this type of issue before.

Anything that can help us find a work around for this expensive repair is appreciated!
 
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This is the first time I have heard of a hydraboost unit failing in this way. Is your mechanic able to pull DTCs from the ABS/VSC/TRAC module? These units are not ready to diagnose and typically require replacement as an assembly due to their construction. There isn't a very good way to bypass the system in any way for this issue. Have you guys noticed the pump making noise more than usual before this?
[MENTION=55855]zopperman[/MENTION] this may be better in the 4th Gen section?
 
Thats got me stumped.. I've heard of relays going bad and allowing power to continue to go to the abs systems causing dead batterys but haven't heard of the boosters themselves having an internal check valve stuck open.

First thoughts would be trash in the system. Have you noticed an increase drag in the vehicle when driving, like having to use more throttle to go the same speed?

Definitely a weird situation.
 

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