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88' k5 stock brakes issue

firemedicsafd

firemedicsafd

Professional Murphy magnet
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On an 88' k5 blazer resto project, i have a brake issue after replacing the following:

SS brake and fuel lines
new pads and shoes front and rear
new Master cylinder
new proportioning valve
33" tires on stock wheels

same calipers
same rear wheel cylinders

The issue:

the brake pedal feels spongy and goes almost all the way down before stopping the truck. It works under normal conditions BUT when i hit the brakes hard...i get the brake warning light, the pedal feels a pop sensation and the vehicle does not stop any better AND locks a rear wheel up. I dont know which one. steering is not affected during any braking operation.

Thank you for your help!
 
You still have air in the system. I would have someone help you and start by bleeding the master cylinder first. Do this just as you would a wheel cylinder/caliper but instead you'll crack each line loose at the master. Once all the air is gone from there then start at the wheels (farthest first working closer as you go). You might also need to reset the prop valve by pushing in the button on the end that is under a rubber cover.
 
did you bench bleed your master before you put it on. they will have a lot of air you need to get out
 
i bench bled the thing i thought very well. but i guess not. Is there a way to bleed the master without removing the lines? Kit or several friends or what? Thank you!
 
Master= bled
Wheels = bled farthest to nearest
Prop valve button = pushed before wheels got bled

Still has issue.

Pedal travels most the distance easily...then grabs quickly, trips the light, and brakes a little better
 
Next I would say to check brake pedal freeplay and adjust as required. A Chiltons book should tell you what it should be and how to adjust it.
 
Sweetk30- the rears did not have an hole i could rotate the adjsuter wheel thru. I did however go in reverse stop and go to adjust them out to where they should be.
 
I'm pretty sure the rear drums have a little tag thing you bash out to make the hole for getting to the adjustments if it hasn't already been done, take a wheel off and have a look, it will be near the bottom edge of the drum, the hole you are looking for is on the outside of the drum its self, not in the back plate
 
Starting with all new stuff, jack up the rear, use stands, and remove the rear wheels. Spin the drums by hand. Remove drum and turn the adjuster wheel to expand the shoes. Replace drum and spin again. Repeat till you get a slight drag. Move to the other side and repeat this process. Make sure both drums are ON before stepping on the pedal. After stepping on the pedal the shoes will recenter themselves. Check for slight drag again and readjust if needed. Test drive and let us know how it does.

Backing up and stopping will take 100+ times before you would have noticed a difference.
 
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