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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+ericthecarguy 've done this many times and the best way to me at least is by getting the plastic fitting adapters that fit into the master cyl. ports and then connect a plastic clear hose to both ports and run them into the master cyl reservoir and do exactly what you're doing and you will be able to see when the air is all purged. pump slow so not to aerate the fluid. no mess.
Some Pig matts under the part being changed can be used to catch any dripping fluids.
Nice video. What I usually do as a shortcut method is bleed the other end of the short master cylinder lines (where they screw into the proportioning valve). Some people I know would just bleed the master as shown in your video and let the car go, but I just never could bring myself to do that.
I'm liking the amsoil cover
As a do-it-yourself guy I think you your video is a god-sent
I'm not sure about whats going on with your 1990 C1500 but I've been looking into spongy braking problems with my 1997 GMC Sierra C1500 after replacing a rusty brake line that blew on me recently, I did a complete system bleed but seem to have lost my once solid brakes so after doing some research I've noticed people in forums and videos talking about doing a automated bleed (for vehicles with ABS) using certain automotive scan tools to activate the ABS module to burp out any air that may be trapped in the module, evidently even if you do a complete bleed and see no bobbles coming from the bleeders there could still be air trapped in the ABS module.
screw it. If you want the best braking, go hydroboost haha
I have a 2000 F150 I have the same issue I did the same thing. I still have the spongy breaking.
You getting old boss, but we still love ya.
I have a 90 chevy c1500 that I've driven for the past 18 years and my brakes have always been crap.
You can make video of newer cars like from 2010 and up
did you ever goy it working right?. im curious what was tje solution.??
I have the same problem of play in my petal after doing mc about 3 years ago and now it is leaking between the hydro booster and master cylinder 🙁
The little cylinder below the master cylinder is most likely your problem.
Tried to do this on an '02 Accord. When putting old reservoir onto new master cylinder it would not seat all way down. Well it would go down then it would raise slightly. No combination of pressure or tightening resevoir screw would keep it down. When installed brake fluid sprayed out of seals were it wasnt seated. Anyone ever have this problem?
USE A SCAN TOOL TO BLEED IT.
Hay Eric I just got a used 03 chevy tracker that doesn't have brakes. I was told there was a bad leak but I haven't found any leaks and when I put vacuum on the rear bleeder there's no fluid and the fluid level doesn't go down but when I bleed the front brakes air/fluid came through and the level went down. Is this just bad lines or something else?
How about the front calipers?
I need one of those refillable pressurized sprayers Eric used with brake clean. Please tell me what its called!!!
Great video, Eric! Especially the outtake at the end!! Thanks!