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^^^ This looks like the answer to this problem. It is a TSB that applies to 2001 models and describes exactly what is happening and the solution.
Originally Posted by Mjk85
where should I be taking it?? I researched as much as possible. Everyone pointed to able Chevy.
Originally Posted by Mjk85
dealer said the think it’s the abs mod. Can replace for $1350.00. Crazy.
Able Chevy should have found the TSB. Definitely worth checking the vacuum brake booster before messing around with the ABS module at the tune of $1,350.00
Thread Starter, the info in that TSB certainly sounds like the symptoms that you are encountering.
The same TSB info is available to the techs at the Stealership but it took someone from the Forum to provide it to you. Sort of says something about the problem diagnosis/research capabilities of the techs you are dealing with. JMHO
Also says something about the invaluable resource this forum can be.
So now the dealer is saying that there are “pretty sure” the ebcm is causing the issue I have asked time and time again if break booster is culprit but they assure me it’s not. They said that when unplugged the issue goes away plug it in and issue reappears. No codes thrown. Thoughts?? Should I proceed or take car else where?? I told them about tsb for boaster her said he saw nothing of the sort posted for them at Chevy!! I’m done throwing money at pretty sure this will fix it!! Any advice is appreciated!
i dont know and am also just learning all these systems..... but the active handling control systems are pretty sophisticated....so are they saying the ecbm is sensing an active handling control feature that is applying the brakes?
dealer said the think it’s the abs mod. Can replace for $1350.00. Crazy.
I had a brake problem when I bought my car. It was one of those thin stainless steel plates that the pads ride on had a groove worn in it, some pads come with a new one an some don't. Probably not your issue but who knows. The dealer doesn't.
ABS or EBCM is used for both Active Handling and for Traction Control. Why would it be just an AH event that the EBCM is sensing and not perhaps a TC event???
excellent observation, i hadn't matured enough to the second point.
so does it have to be sensory input that causes the EBCM to activate or can it be an internal flaw or corruption that makes it have a mind of its own..i guess as I type this i realize it could be either...
So now the dealer is saying that there are “pretty sure” the ebcm is causing the issue I have asked time and time again if break booster is culprit but they assure me it’s not. They said that when unplugged the issue goes away plug it in and issue reappears. No codes thrown. Thoughts?? Should I proceed or take car else where?? I told them about tsb for boaster her said he saw nothing of the sort posted for them at Chevy!! I’m done throwing money at pretty sure this will fix it!! Any advice is appreciated!
If you feel like giving them another opportunity, print the TSB and discuss it with them. Observe their reaction and their response to it, and then decide whether or not to let them proceed.
At this point, and given the way they have handled the problem, perhaps you should consider taking the car elsewhere and begin with a clean slate with someone that doesn't have to present a "self-defense" to justify not having been able to find a TSB
I would suggest that wherever you go, you take with you the printed TSB and discuss it upfront, along with the history of repairs already done.
Before seeing that service bulletin I would have suspected the brake booster as the most likely culprit. In fact, as pretty much the only culprit.
The master cylinder CAN NOT pull the brake pedal down because the master cylinder CAN NOT pull on the rod coming from the brake booster. The rod simply has a blunt end that pushes against the piston in the master cylinder. The booster will return the pedal regardless of what the master cylinder is doing.
The booster will store vacuum. So, shut the engine off and then step on and off the brake pedal hard 4 or 5 times. The pedal should begin to fully return as the vacuum is depleted in the booster.
Last edited by lionelhutz; 06-07-2018 at 01:24 PM.
If you feel like giving them another opportunity, print the TSB and discuss it with them. Observe their reaction and their response to it, and then decide whether or not to let them proceed.
At this point, and given the way they have handled the problem, perhaps you should consider taking the car elsewhere and begin with a clean slate with someone that doesn't have to present a "self-defense" to justify not having been able to find a TSB
I would suggest that wherever you go, you take with you the printed TSB and discuss it upfront, along with the history of repairs already done.
can you send a link for that I’m going there today or tomorrow to drop off ebcm
Post #23 has the link you want. Click on the word "This" in the post.
Originally Posted by Mjk85
What tsb!?
Can you send a link for that. I’m going there today or tomorrow to drop off ebcm.
I'm sorry you didn't catch that when it was posted. All posts after Post 23 were written with the tacit understanding that the Technical Service Bulletin (TSB) had been read.
It's your car and therefore it's your decision, but I wouldn't let them touch the EBCM. Run, Forrest, run!
Note: for your convenience, I included links to Post 23 and TSB here in my message.
1st off f able Chevy. They suck ***. I was better off from searching the web and going off natural instinct!! Ecbm abs mod break lines calipers master cylinder rotors pads. Guess what’s left and what I suspected the whole time!!!! My break booster!! $220 part had to pay $6600 to figure it out and at that I figured it out!! Sure they did the work but I dignosed the issue. Cars running fine other than misfire.
I've always noticed, when swapping out the driving (summer) wheels/tires for the storage (winter) wheels/tires, on my car, that the front wheels don't spin all that freely. My car is an '01 also, and it's been that way for as long as I can remember. The drag isn't enough to generate enough heat for the wheels to be warm to the touch, after a reasonable ride, but I have thought that the wheels should spin a little more freely.
Assuming that it's the power booster, and assuming that the new part is still available, is this a simple enough job that can be done at home?
^^^ This looks like the answer to this problem. It is a TSB that applies to 2001 models and describes exactly what is happening and the solution.
Able Chevy should have found the TSB. Definitely worth checking the vacuum brake booster before messing around with the ABS module at the tune of $1,350.00
POST 25:
Originally Posted by 8VETTE7
Thread Starter, the info in that TSB certainly sounds like the symptoms that you are encountering.
The same TSB info is available to the techs at the Stealership but it took someone from the Forum to provide it to you. Sort of says something about the problem diagnosis/research capabilities of the techs you are dealing with. JMHO
POST 34:
Originally Posted by lionelhutz
Before seeing that service bulletin I would have suspected the brake booster as the most likely culprit. In fact, as pretty much the only culprit.
The master cylinder CAN NOT pull the brake pedal down because the master cylinder CAN NOT pull on the rod coming from the brake booster. The rod simply has a blunt end that pushes against the piston in the master cylinder. The booster will return the pedal regardless of what the master cylinder is doing.
The booster will store vacuum. So, shut the engine off and then step on and off the brake pedal hard 4 or 5 times. The pedal should begin to fully return as the vacuum is depleted in the booster.
POST 38:
Originally Posted by GCG
I'm sorry you didn't catch that when it was posted. All posts after Post 23 were written with the tacit understanding that the Technical Service Bulletin (TSB) had been read.
It's your car and therefore it's your decision, but I wouldn't let them touch the EBCM. Run, Forrest, run!
Note: for your convenience, I included links to Post 23 and TSB here in my message.
Originally Posted by Mjk85
1st off f able Chevy. They suck ***. I was better off from searching the web and going off natural instinct!! Ebcm abs mod break lines calipers master cylinder rotors pads. Guess what’s left and what I suspected the whole time!!!! My break booster!! $220 part had to pay $6600 to figure it out and at that I figured it out!! Sure they did the work but I dignosed the issue. Cars running fine other than misfire.
So sorry for your ordeal, but as they say you can lead a horse to water, but you can't make him drink. The solution was posted by AllVette in Post 23 (a detailed service bulletin from GM) and commented on and analyzed many times after that
06-01-2018, 01:13 PM
JMHO
