Brakes fade when coming to a final stop 1998 Chevrolet silverado

What is the most likely cause of brake pedal pulsation? If your brakes are pulsating, it likely means your brake rotors are warped, and failure to replace them could result in unsafe driving conditions

you have a wiring issue there...check battery connections, connections at altenator, junction box and fuse pass through at the firewall. Make sure you follow your ground wires too should be one from the battery to block and frame to block

Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Few latest troubleshooting help links related to these problem.
ABS light stays on but brakes work fine? http://howtobyme.blogspot.com/2011/11/abs-light-stays-on-but-brakes-work-fine.html

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Sometimes ABS light comes on while Driving?

http://howtobyme.blogspot.com/2011/12/sometimes-abs-light-comes-on-while.html

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Brake Fade Issue? http://whoisbyme.blogspot.in/2012/07/brake-fade-issue.html Brake System Troubleshooting? http://technoanswers.blogspot.com/2011/11/brake-system-troubleshooting.html Car Brake lines have no pressure? http://schematicsdiagram.blogspot.com/2011/12/car-brake-lines-have-no-pressure.html Car Brakes Dragging? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-dragging.html Car Brakes grabbing? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-grabbing.html Car Brakes Making Noise? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html Car Brakes Pulling? http://repairhelpcenter.blogspot.com/2011/12/car-brakes-pulling.html Pulsating Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/pulsating-brake-pedal.html Spongy brake pedal? http://repairhelpcenter.blogspot.com/2011/12/spongy-brake-pedal.html Hard Brake Pedal? http://repairhelpcenter.blogspot.com/2011/12/hard-brake-pedal.html Fading Sinking Brake pedal? http://whoisbyme.blogspot.in/2012/06/fading-sinking-brake-pedal.html Brakes make Grinding noise? http://repairhelpcenter.blogspot.in/2012/06/toyota-corolla-brakes-make-grinding.html

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These will help.
thanks.

Does your brake pedal hold pressure when just pressing down while stopped? If not, the bleeding has not released all of the air yet...or the master cylinder is bad...my thoughts are still the bleeding of the lines or you would have noticed the fading pedal before attempting to drive. Be sure to bleed at each wheel cylinder bleeder valve. You must start at the right rear, then left rear, then right front, last the left front. You did not mention why you were changing some of the brake lines? Your Silverado does not sound old enough to need this unless you had under body collision, or unusual rust present. Hope this helps.

e-brake pedal should go farther- is either out of adjustment or cable frozen- secondly sounds like only front brakes receiving enough pressure to "activate" properly- bleed all four brakes starting rear pass,then rear drive ,then front pass, then front drive- use plenty of fluid- bleed till fluid is clean without bubbles- will that long at first- this will insure not bubbles and no moisture- if a pro valve dies,you would have more problems- pedal would be really soft,would have both a brake light and abs warning lights

if its set up for trailers with brakes, it should have small black box under the dash above the pedals; if there is one you can adjust the brake timing to syncronize the trailers brakes with the trucks; if there is not one you can purchase one and mount it and run a few wires

if you have abs the electic noise you hear is most likely coming from the abs modulator. as for the rear brakes intermittently locking up, the most common problem is overadjusted rear brake shoes, under adjusted rear brake shoes, or excessive brake dust inside the drums.

you got it, the booster is leaking reducing the vacuum to the intake, replace it

plug it back in and bleed your brakes dude.