hatzie
I'm Awesome
I thought the Hayes 4W ABS started in 1995, didn't think they offered anything other than RWAL before 1995.
There are a bunch of little hydraulic pumps in the 4W ABS module. They have to be operated in sequence.
92-2002 Kelsey Hayes 4 Wheel ABS "Power Bleed"
- Thread starter hatzie
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There are a bunch of little hydraulic pumps in the 4W ABS module. They have to be operated in sequence.
Im dealing with a 1994. There's one big pump motor, a terminal pump motor PWR, and another for pump motor GND....among several other pins If I put 12v to pump motorPWR, and ground the GND, will it activate the pump? I'M assuming it's a 12v pump....
The solenoids are as much of the issue as the pump.
Running the pump without chattering the solenoid valves is a waste of time.
There are THREE primary kinds of ABS on GMT400 vehicles.
RWAL, common on pickups from '88 (early, iron body that has it's own bleeder screw, later aluminum body with no bleeder screw)
EBC4, some GMT400s '92--'94 but I think this was more SUVs than pickups; and
EBC310, '95-up GMT400.
Service procedures are not the same for these. See attached document for the 4-wheel (3-channel) ABS bleeding procedures.
Running the pump without chattering the solenoid valves is a waste of time.
There are THREE primary kinds of ABS on GMT400 vehicles.
RWAL, common on pickups from '88 (early, iron body that has it's own bleeder screw, later aluminum body with no bleeder screw)
EBC4, some GMT400s '92--'94 but I think this was more SUVs than pickups; and
EBC310, '95-up GMT400.
Service procedures are not the same for these. See attached document for the 4-wheel (3-channel) ABS bleeding procedures.
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