ABS problem
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
ABS problem
Sometimes when I am parking or backing-up slowly braking , my ABS pump starts to operate and the car accelerates suddenly. I have to brake strongly and rapidly to prevent the car from hitting something.
This problem started a few month ago and happens perhaps once every 20 - 50 times only.
Anyonyone has an idea how to solve this problem?
This problem started a few month ago and happens perhaps once every 20 - 50 times only.
Anyonyone has an idea how to solve this problem?
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Have a qualified shop check for any computer codes and entire brake system to include the ABS Module.
I would not continue to drive the vehicle in that condition which could result in someone's injury or death. Please be safe.
I would not continue to drive the vehicle in that condition which could result in someone's injury or death. Please be safe.
Last edited by GKK; May 16, 2010 at 10:33 PM.
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
But the brakes do work fine at normal speeds, also at low speeds, never a problem. It just happens when parking, mainly when I slowly are backing-up braking to creep like a snail.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
In an '84? ABS wasn't till '86.
I had something similar happening when coming to a stop. It was my cruise control kicking on. Now I leave the switch in the off position when driving around town.
I had something similar happening when coming to a stop. It was my cruise control kicking on. Now I leave the switch in the off position when driving around town.
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
I would suspect the computer is not seeing the slow speed. That could be VSS and related wiring or the computer.
My reasoning is that ABS should not turn on until 5mph and should turn off at 4mph (If those aren't the exact speeds then they are close enough for my logic to be valid anyway.)
At slow speeds your ABS should not be a factor.
If you can find a safe place like the parking lot of an industrial area on Sunday morning try to make the problem happen and look at the indicated speed on the dash. I bet when this happens as you're really trying to park your eyes are outside the cockpit! but in a safe place you can look at the dash.
You may wish to look at the plastic gears in the trans too to make sure they have all their teeth.
You can always disable ABS until you get it fixed by pulling the fuse.
My reasoning is that ABS should not turn on until 5mph and should turn off at 4mph (If those aren't the exact speeds then they are close enough for my logic to be valid anyway.)
At slow speeds your ABS should not be a factor.
If you can find a safe place like the parking lot of an industrial area on Sunday morning try to make the problem happen and look at the indicated speed on the dash. I bet when this happens as you're really trying to park your eyes are outside the cockpit! but in a safe place you can look at the dash.
You may wish to look at the plastic gears in the trans too to make sure they have all their teeth.
You can always disable ABS until you get it fixed by pulling the fuse.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
wondering if the teeth on the reluctor rings on the wheels are dirty and filled with junk that is allowing the abs sensor to think that the rear wheels are locked up. , or maybe there is a metallic foreign object across the sensor on one wheel.
try going to absfixer.com, and type in your problem in the "contact us" area and see if they can shed some light on this.
try going to absfixer.com, and type in your problem in the "contact us" area and see if they can shed some light on this.
Last edited by coupeguy2001; May 20, 2010 at 04:28 PM.
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Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Yes, the light comes on when I drive away and than approx every 10 minutes. The pump start to run a second and a light ABS active comes on Also when the fault happens, the light comes on
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
I would suspect the computer is not seeing the slow speed. That could be VSS and related wiring or the computer.
My reasoning is that ABS should not turn on until 5mph and should turn off at 4mph (If those aren't the exact speeds then they are close enough for my logic to be valid anyway.)
At slow speeds your ABS should not be a factor.
If you can find a safe place like the parking lot of an industrial area on Sunday morning try to make the problem happen and look at the indicated speed on the dash. I bet when this happens as you're really trying to park your eyes are outside the cockpit! but in a safe place you can look at the dash.
You may wish to look at the plastic gears in the trans too to make sure they have all their teeth.
You can always disable ABS until you get it fixed by pulling the fuse.
My reasoning is that ABS should not turn on until 5mph and should turn off at 4mph (If those aren't the exact speeds then they are close enough for my logic to be valid anyway.)
At slow speeds your ABS should not be a factor.
If you can find a safe place like the parking lot of an industrial area on Sunday morning try to make the problem happen and look at the indicated speed on the dash. I bet when this happens as you're really trying to park your eyes are outside the cockpit! but in a safe place you can look at the dash.
You may wish to look at the plastic gears in the trans too to make sure they have all their teeth.
You can always disable ABS until you get it fixed by pulling the fuse.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Here is a link with some good ABS diagnostic info, good luck.
http://www.corvetteactioncenter.com/...abs/index.html
http://www.corvetteactioncenter.com/...abs/index.html
Thread Starter
Racer
Joined: Oct 2005
Posts: 405
Likes: 0
From: 1984 crossfire, Alhaurin de la Torre Malaga, Spain
Here is a link with some good ABS diagnostic info, good luck.
http://www.corvetteactioncenter.com/...abs/index.html
http://www.corvetteactioncenter.com/...abs/index.html
