My scan tool says ABS on it but then it says ABS is not supported for this vehicle. I know I need to update the software I don't know if it can activate the ABS or not I need to see about downloading updated software .

 

All right I'll get to it now I can access the old calipers I still do have those I will reinstall at least one maybe both take it out for a drive and see what happens and go from there.. thanks for your time and your direction GeorgeLG. I'LL GET BACK TO YOU AS SOON AS POSSIBLE

 

Those codes are the cat, O2 sensors, and evap system which are largely unrelated with the possible exception of a vacuum leak. All of that will give us plenty to work on later. For now you have started proper diagnosis, you know you have a problem somewhere between the brake pedal and he MC pushrod. Get that figured out and fixed and then verify the fix that the brakes work and pulling the MC out 1/4" no longer matters. Then we continue.


George

 

Ok.thank you.

 

You have to fix the issues at the firewall first because we know that your brakes are going to drag no matter what caliper you have. As a matter of fact driving with dragging brakes due to a hydraulic problem may be overheating the calipers and causing good ones to fail.

George

 

If you want to compare calipers do it cold. Mount the old one, pump everything up with the MC mounted properly, release the hydraulic pressure at the caliper and then see how much it grabs and how much noise it makes. The new pads complicate this somewhat because they are not yet seated 100% level and smooth like the old ones.

I will reiterate, the best approach is to partition the brake circuit into sections, test each area and then go further when you find a fault. Do a targeted repair and then verify. Stabbing at it and swapping parts can introduce new problems where there were no problems because of inferior non AC Delco parts or install issues and/or you might waste time and money. You have a verified problem, get that fixed and you are becoming a first rate auto mechanic.


George

 

Fix your verified problem first at the firewall/wheel well.

George

 

Does your idle rpm change or does the engine idle differently when you apply the brakes while it running?


George

 

Ive had to take a short reprieve and go out of town briefly but I will get back at it tonight. But to answer your question yes if I pump the brakes when the engine is at idle it does mess with my idle rpms

 

We know we have a problem at the firewall and now we know we probably have a vacuum problem during braking so the boost may be involved. You can start by watching this:


You can verify that braking is causing a vacuum leak by watching fuel trims or a vacuum gauge during braking.


George