No firm brake pedal in ABS system

[Wildman318]

We have several Chevrolet and GMC 1 ton dump truck's with ABS brake systems. We had to replace all the rotted brake lines  and now cNt get a firm brake pedal. Is there a special procedure for this type if brake system? Wildman318

[davester]

Did you bench-bleed the master cylinder, then bleed all 4 corners (furthest from MC to nearest), then use a computer hooked up to the truck to bleed the ABS system, then bleed all 4 corners again (same order)?

[davester]

And you may want to flush the power-steering system, as the hydroboost uses it for the power-assist braking, and it can make a difference in pedal-feel.