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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-26-2004, 12:55 AM   #11
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Quote:
Originally Posted by panda1956
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Originally Posted by fuddyduddy121
If the brakes overheat on my car, then the antilocks will shut off.
I do you appreciate that kind of brakes failure?
Translation?
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Old 04-26-2004, 12:59 AM   #12
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Originally Posted by panda1956
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Originally Posted by fuddyduddy121
If the brakes overheat on my car, then the antilocks will shut off.
I do you appreciate that kind of brakes failure?
Translation?
Sorry I missed my last sentence...I am french Canadian.
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Old 04-26-2004, 11:03 AM   #13
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Well, not exactly. The TEVES ABS can be separated into two systems: the boost circuit which gives you power brables and the ABS circuit which provides the antilock feature.

If the boost cuircuit goes out, the pedal will get hard (but standing on it will still provide some braking from the front brakes only). If the ABS goes out, the brakes will feel normal but will not prevent the brakes from locking.

The experience described sounded more like a pump relay failure which caused a lack of boost. When the pressure dropped low enough (under 1500 psi AFAIR), the ABS also turned off because it would be unreliable. At this age the relay often needs replacement and is a good place to start since a remanufactured TEVES is $600 from Prior and a relay is about $12.

BTW a good system should provide 10 or more assisted stops even after the red light comes on. If it gets hard with one or two applications it probably needs a new accumulator (about $100 from GMPartsDirect) which is typical at this age.

The car I have the TEVES on (not the Bonneville) has two brake warning lights, a red (boost) one and a yellow (ABS) one. If the red light is on, the yellow will be also. A failure in the ABS circuit (extractable through the ALDL) will not turn the red light on by itself.

There are a series of tests on the Reatta site for the TEVES that may be helpful.
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Old 04-26-2004, 11:43 PM   #14
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Originally Posted by padgett
Well, not exactly. The TEVES ABS can be separated into two systems: the boost circuit which gives you power brables and the ABS circuit which provides the antilock feature.

If the boost cuircuit goes out, the pedal will get hard (but standing on it will still provide some braking from the front brakes only). If the ABS goes out, the brakes will feel normal but will not prevent the brakes from locking.

The experience described sounded more like a pump relay failure which caused a lack of boost. When the pressure dropped low enough (under 1500 psi AFAIR), the ABS also turned off because it would be unreliable. At this age the relay often needs replacement and is a good place to start since a remanufactured TEVES is $600 from Prior and a relay is about $12.

BTW a good system should provide 10 or more assisted stops even after the red light comes on. If it gets hard with one or two applications it probably needs a new accumulator (about $100 from GMPartsDirect) which is typical at this age.

The car I have the TEVES on (not the Bonneville) has two brake warning lights, a red (boost) one and a yellow (ABS) one. If the red light is on, the yellow will be also. A failure in the ABS circuit (extractable through the ALDL) will not turn the red light on by itself.

There are a series of tests on the Reatta site for the TEVES that may be helpful.

Thanks alot for this technical lesson.
I guess that I will have to go by elimination to solve this problem.
The only time that this is happening is when I am in the middle of a bumpers to bumpers slow trafic congestion.
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Old 04-27-2004, 04:23 AM   #15
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It could also be the pump motor itself is not working. If the pump is weak it will not be able to replenish the pressure in the accumulator as fast as you are using it. The pump is very expensive to replace. When thie pump failed on my car, i took the motor apart, cleaned it out and replaced the brushes. It works perfect now. Ask the dealer if they will let you photocopy the TEVES DIAGNOSIS part of the service manual.
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