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-   -   740: Manually activate and pump???? (https://forums.tbforums.com/showthread.php?t=350126)

gottarollwithit 07-10-2019 04:45 PM

Manually activate and pump????
 
I got an 88í 740t

How the heck do you manually activate the abs pump? Perhaps pull a relay and jump pins? Which ones???

Really donít want to stomp the brakes to trigger the abs. Would prefer to run it for a few pulses while pressure bleeding. I got air in the system that I think is coming in/out of the pump, so I get occasionally mediocre brakes...

dl242gt 07-10-2019 05:12 PM

Bleeding the brakes in the normal method with a pressure bleeder has always gotten the air out of the system on an abs car. At least that is my experience. Maybe get a small hammer and lightly tap on the junctions when bleeding? That should break free any stuck air bubbles.

gottarollwithit 07-10-2019 09:03 PM

I think Iím beyond the normal situation like that. A couple yes back I had a shop replace my master. I think they somehow got air in my ABS pump and Iíve never gotten it out since.

Iíve pressure bled a couple times since then...

gottarollwithit 07-12-2019 02:06 AM

Anybody?? I know i've come across this info somewhere...

MasterBlaster 07-14-2019 06:07 PM

Mitchell manual says bleeding is done with the brake pedal, nothing else.
However (and I take zero responsibility if you fry your entire ABS system).....

RELAYS

Pump Motor Relay

1) With ECU connector still unplugged, turn ignition switch to the "ON" position. Jumper ECU terminal No. 28 to ground.


NOTE: Relay should not remain grounded for more than 2 seconds or damage to relay may occur.

2) Hydraulic Modulator should operate while jumper is installed.


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