In truth, this is a video about how to replace and bleed a master cylinder on a C1500, 1990 5.7L to be specific. However, I do have information on how you can solve a spongy brake pedal on one of these trucks by replacing the master cylinder and booster with parts from a later model truck.
Here are those part #’s
Master Cylinder: M390259
Booster: 5471046
Direct Links
Master Cylinder: https://www.amazon.com/Dorman-M390259-Brake-Master-Cylinder/dp/B001PYRLAM
Booster: https://www.oreillyauto.com/detail/brakebest-brakes-4474/brake-systems-16456/brake-hydraulics-16513/power-brake-booster-11301/power-brake-booster/5471046/4567555
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Camera: Derek Sims & Eric Cook
Discussion about this video: https://www.ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/69816-how-to-fix-a-spongy-brake-pedal-chevy-truck
Links
Line Wrenches: https://store.snapon.com/Open-End-and-Flare-Nut-mm-5pc-6-Point-Open-End-Flare-Nut-Metric-Wrench-Set-10-mm-14-mm--P630777.aspx
Plastic Plugs: https://parts.cat.com/en/catcorp/shop-supplies/caps-and-plugs/9U-7075
Silicone Spray: https://www.wd40specialist.com/products/silicone-lubricant/
Zep Brake Cleaner: http://www.drillspot.com/products/643623/zep_r18935_brake_wash_solution
Zep Brake Cleaner Sprayer: http://www.apmengineparts.com/829801.html
Master Cylinder Bleeding Tool: https://www.jbtoolsales.com/thexton-804-master-cylinder-bleeder-kit#oid=1002_1
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5.7L Water Pump Replacement (Part 1): https://www.youtube.com/watch?v=trhJrE1I3kk&t=18s
5.7L Water Pump Replacement (Part 2): https://www.youtube.com/watch?v=6kElUsAPkoA
How To Bleed Brakes: https://www.youtube.com/watch?v=V5O_pbC8R2E&t=6s
How To Replace a Wheel Cylinder: https://www.youtube.com/watch?v=p8k5GfTpZr4
1999 Chevy Tahoe Rear Brake Shoe Replacement (Part 1): https://www.youtube.com/watch?v=195JUby2Uy4
1999 Chevy Tahoe Rear Brake Shoe Replacement (Part 2): https://www.youtube.com/watch?v=D6I9HtUC_hM
How To Deal With a Spongy Brake Pedal (Honda): https://www.youtube.com/watch?v=KIQIBLGoZJ4&t=1s
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Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy®.