Brake bias after EBCM code/failure
Thread Starter
3rd Gear
Joined: Feb 2021
Posts: 3
Likes: 0
Brake bias after EBCM code/failure
Two questions I hope someone may know the answer to:
1) After an EBCM code or failure, does the car have a base brake bias it reverts back to? From searching the forum, looks like the ABS system adjusts the bias on the fly. With no EBCM, and therefore no ABS, I would imagine this bias either goes back to some preset or maybe freezes in the last position it was in?
2) Can you cycle the ABS system with a Tech II (or similar) with a non functioning EBCM?
Thanks!
1) After an EBCM code or failure, does the car have a base brake bias it reverts back to? From searching the forum, looks like the ABS system adjusts the bias on the fly. With no EBCM, and therefore no ABS, I would imagine this bias either goes back to some preset or maybe freezes in the last position it was in?
2) Can you cycle the ABS system with a Tech II (or similar) with a non functioning EBCM?
Thanks!
Racer
Joined: Aug 2019
Posts: 289
Likes: 64
From: Edinburgh, Scotland
My ‘99 without active handling has a separate brake bias valve (type M EBCM).
Other years are certainly controlled by the EBCM but I think with a high degree of certainty the front/rear bias won’t disappear if there’s a fault. It’ll revert to a safe “normal” setting (if bias does actually change through normal function)
I’m not certain control via the OBD port if there’s a fault but unless it’s gone bad I imagine the pump can still be made to run.
Other years are certainly controlled by the EBCM but I think with a high degree of certainty the front/rear bias won’t disappear if there’s a fault. It’ll revert to a safe “normal” setting (if bias does actually change through normal function)
I’m not certain control via the OBD port if there’s a fault but unless it’s gone bad I imagine the pump can still be made to run.
Last edited by silver50; Feb 24, 2021 at 01:06 PM.
Melting Slicks
Joined: Oct 2007
Posts: 2,375
Likes: 426
Oh God! Another problem with those late model C5s!
As if the cracking valve springs that toast the engine and the leaking gas tanks that turn the late C5s into a Pintoesque inferno weren't bad enough!
Now we have unbiased brake applications caused by failing EBCMs! Yee Gods!
I don't know how people can drive with the random brake applications of the late model EBCMs with devil active handling. How did GM sell these things to an unsuspecting public?
Oh the humanity!
Back to the old days when brake proportion valves were separate from the EBCM. The car still maintains its' handling integrity and drive ability with or without ABS and safely takes its occupants to their destination.
Only in the pre-2001 C5s can you find such safety and performance going hand in hand.
God save the Queen!
I think there's a You-Tube video in there somewhere.
As if the cracking valve springs that toast the engine and the leaking gas tanks that turn the late C5s into a Pintoesque inferno weren't bad enough!
Now we have unbiased brake applications caused by failing EBCMs! Yee Gods!
I don't know how people can drive with the random brake applications of the late model EBCMs with devil active handling. How did GM sell these things to an unsuspecting public?
Oh the humanity!
Back to the old days when brake proportion valves were separate from the EBCM. The car still maintains its' handling integrity and drive ability with or without ABS and safely takes its occupants to their destination.
Only in the pre-2001 C5s can you find such safety and performance going hand in hand.
God save the Queen!
I think there's a You-Tube video in there somewhere.
Le Mans Master
Joined: Jul 2010
Posts: 6,001
Likes: 722
Oh God! Another problem with those late model C5s!
As if the cracking valve springs that toast the engine and the leaking gas tanks that turn the late C5s into a Pintoesque inferno weren't bad enough!
Now we have unbiased brake applications caused by failing EBCMs! Yee Gods!
I don't know how people can drive with the random brake applications of the late model EBCMs with devil active handling. How did GM sell these things to an unsuspecting public?
Oh the humanity!
Back to the old days when brake proportion valves were separate from the EBCM. The car still maintains its' handling integrity and drive ability with or without ABS and safely takes its occupants to their destination.
Only in the pre-2001 C5s can you find such safety and performance going hand in hand.
God save the Queen!
I think there's a You-Tube video in there somewhere.
As if the cracking valve springs that toast the engine and the leaking gas tanks that turn the late C5s into a Pintoesque inferno weren't bad enough!
Now we have unbiased brake applications caused by failing EBCMs! Yee Gods!
I don't know how people can drive with the random brake applications of the late model EBCMs with devil active handling. How did GM sell these things to an unsuspecting public?
Oh the humanity!
Back to the old days when brake proportion valves were separate from the EBCM. The car still maintains its' handling integrity and drive ability with or without ABS and safely takes its occupants to their destination.
Only in the pre-2001 C5s can you find such safety and performance going hand in hand.
God save the Queen!
I think there's a You-Tube video in there somewhere.
If your ebcm is out your have old school brakes no help on slippery road, if your that old to remember.
Thread Starter
3rd Gear
Joined: Feb 2021
Posts: 3
Likes: 0
C1233 is the code. The previous owner changed the wheel speed sensor and associated harness without any luck. He and his mechanic dug deeper and decided it was most likely the EBCM.
I drove the car hard at Mid Ohio without the nannys, knowing to keep an eye out for wheel spin and lockup, and the car still drove great! I was just curious.
I drove the car hard at Mid Ohio without the nannys, knowing to keep an eye out for wheel spin and lockup, and the car still drove great! I was just curious.
