[speedygonzales]

Yes folks I started that post back in 2013. I thought at the time I was onto something. I wasn't the first to do the MC change.

Let me cut to the chase first before I give you a little back story so if you don't need the back story you don't have read it.

You only need to bleed the ABS system.

TO DO THIS:
Bleed the brakes like normal.
Do or have done the ABS Automated Bleed Procedure
Bleed the brakes one more time like normal.

When DONE, the brakes are like new, better than anything else.

Back story.
So after doing numerous bleeds (the standard way) using new fluid and being sure to remove all the old fluid.

Changed the Master Cylinder (MC) to the New Body Style (NBS) AKA GMT800. and thought wow I'm on to something. Changed the front calipers to 2 piston style and the rotors to slotted. Eh was OK.

Oh yeah changed the hoses to braided style. NOPE none of this compares to running the automatic bleed procedure. I didn't even do it right and it still was like my old brakes were back.

Summer of 2017 I bought my son a 1984 GMC K1500. I noticed his MC was the exact same one that came on our trucks from the factory. BUT his truck would snap your neck if you pressed the brake too hard.

Read that again, the 1984 had the same MC as our trucks. So what is the difference?

I was convinced it was our ABS. But how? It had to be causing a restriction. His works fine, ours seems like crap. That has to be it. I wanted to make short intermediate lines to test it by jumping around the ABS module but you know how that goes. Life goes on and good intentions.

So fast forward to a few days ago and I'm chiming in a brake problem and guy there says you can't just bleed a problem away. You have to get the "procedure" done.

It doesn't seem to make sense to anyone else either but there are post after post after post stating if you don't do it you don't get your brakes back. Several others said they had it done and damn if they don't have their brakes back to normal.

I told a guy I doubt it but I would try it. So I pulled out the Solus and checked and sure enough there it is in front of God and everybody. The Automatic Brake Bleed. Never thought to look for it cause I was sure I didn't need it. How could that have an effect on our normal brake operation???

Now I did not do the actual correct operation YET. By that I mean I did not bleed the brakes first, run the ABB and then bleed again.

I ONLY RAN THE ABB. I did not bleed them first and after, YET, but holy crap what a difference. The old brakes are back.

So I got the old brakes back and I haven't even done the correct procedure.

So here's what happened during the procedure. You have the vehicle running and your foot on the brake pressing it. It does something to cause the brake pedal to go all the way down. Then it works it's way back up and it goes down and up and does this a few times and then the pedal ends up like it started. Took it for a ride and holy crap.

IN the next few days, cause of weather in VA, I'll do a full bleed, run the ABB again and bleed once more and I'm done chasing the problem down.

For what it's worth I did NOT discover the solution, I'm merely bringing it to everyone's attention.

If you have to have this done at a service center of some sort, ask the tech if this has been their experience. It sure would be nice to put this issue to bed once and for all.

Good luck to you all. Oh and if you're in the Hampton Roads area, you can stop buy any time I'm home for help. Not after 9 PM though.