View Full Version : more abs symptoms

08-27-2004, 01:06 PM
after reading the numerous posts on the 90 abs problems ive learned alot . but heres where i am. new relays (both). but pump wont run by itself , i can manually start pump by closing contacts on the abs relay ,pump runs as long as i hold contacts closed. brake light goes out and i have brakes.after a few pumps on brake pedal brake light comes back on and brakes harden up. also abs light stays on all the time.fuses are good. ?? i would like to confirm if its the accumulator or pressure switch? at least pump motor is operational. when i ground pin 4 to chassis nothing happens , when i jump pin 3 to 4 pump runs as long as i have it jumped. any input would be appreciated. as i said alot of this has been covered but alittle different than my particular situation.. thanks :confused:

08-27-2004, 03:46 PM
Sounds like a bad pressure sensor/switch on the pump.

09-28-2004, 07:43 PM
well after replacing accum and pressure switch. things are looking positive.pump now cycles on its own . as usual .. after 7 brake pumps brake light comes on until accum. pressures up then brake light goes out. why would a b s light stay on all the time??? im hoping someone tells me after i bleed the system things will be fine???? thanks larry