Question about 1988 Chevrolet K1500

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!988 k1500 4x4 5.7l brakes

I have replaced front pads and roters, whole rear brake assy on both sides, bled everything, I HAVE GOOD PEDEL BUT SORRY STOPPING POWER. i cant even stop when towing a small boat.(18FT)
ABS light has been on and i cant find location on sensor.
I have used both feet and stand on pedel and still wont stop hard.
i dont think problem with abs would cause this but then im writing to you, right.
I think rear brakes are not working since front rims will get warm and rear are cool, i have pulled down rear brakes and adjusted them to the point of barely getting drum on(why didnt they put slots in these trucks to adjust the brakes???)i have checkedthe adjuster to make sure its adjusting.

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Are you getting flow to the rear cylinders? Nevermind...you said you bled everything. Since the ABS light is on, I question if the ABS Control Module maybe the problem. I'm currently rebuilding the brake system on a 90 model Silverado. A buddy of mine replaced the master cylinder in his girls truck but errantly added power steering fluid to it which didn't work out to well. I've replaced the MC and all 3 rubber hoses (2 to the front and 1 to the rear). Since the front calipers hadn't seized, I simply dumped the existing fluid from them and flushed them good with brake fluid. Using a vacuum bleeder, I've gotten the air out of the front calipers but can't seem to get any flow (neither fluid or even air) through the rear lines. I'm beginning to think that replacing the ABS Module and possibly the rear cylinders might do the trick.

Posted on Aug 23, 2012

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With vehicle off pump pedal until it gets hard and yu don't hear any exhaust air coming from power booster . keep foot on pedal start engine . pedal should fall slightly . this is a sign that booster is working . if nothing happens i would do additional test to check power assist booster .

Posted on Jan 16, 2012

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Bleed right rear,left rear, right front, left front in that order to be sure of good bleed but the brake booster makes it easy to push pedal. Make sure of no leaks from master cylinder. Otherwise brake hoses being soft will also hurt baking quickly.

Posted on May 24, 2009

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