90 Mazda B2600 ABS light

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Hi as you can see from the title, I have a 1990 Mazda B2600 4x4, 5 speed. The problem is that the ABS brake system is not working. The ABS light is on (comes on as soon as the truck is started) and the rear brakes lock up when the brakes are applyed with moderate pressure. The e brake light is also on.
I have replaced the ABS hydraulic unit, this part is located on the right side under the bed, above the rear axle. This part is about 6 in long and mabe 1.5 to 2.5 in round. It has 2 brake lines connecting to it and a 4 pin electrical connector coming out of it.
After replacing this part the e brake light now goes of when you reliease the e brake. The ABS light doesnt come on at first but, after driving for a minute or soo it comes on. The rear brakes lock up even when the light is off.
Any help would be great. Thanks..matt

posted by  goodwrencher21

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