hmm.. this has happened a couple of times now and i am confused as to why

the ABS warning light has come on and not gone away, confused by this i drove around for a while hopeing it would go away, it didnt so i went to a patch of gravel i know and slammed on the brakes to test if the ABS was still working.. the ABS worked fine and shortly after i did this the light went away! the second time it came on i again intentionally enguaged the ABS and again after i did this the light went away..?

anyone have any idea what is up with this? a glitch in the program or some potential problem with the system?

cheers

usually light on means go in for service asap...

As with airbags.

I'd give MMAL a ring dude

usually light on means go in for service asap...

As with airbags.

I'd give MMAL a ring dude


check both rear abs senors on the wheel hubs, make sure there not broken and still connected.

if there broken then ur stuck with a part that costs 375 from the dealer...

actually i have one that i dont need...

I have a question about the effectiveness of ABS actually. If you SLAM the breaks in gravel, in theory there should be no lockup right?

Well the other day I was driving, takeing a long sweeping curve downhill at about 90 km/h. There was an unexpected stop in traffic and I had to break quite heavily. Ie plant the breaks. The front wheels locked up for about a second. I assumed that going downhill, the added weight on the front disks overpowered the ABS system and it took a breif second before it engaged? Is this likely? Ive never had any ABS lights come on, and breaking generally seems fine, but this one time got me thinking about ABS effectiveness.

I have a question about the effectiveness of ABS actually. If you SLAM the breaks in gravel, in theory there should be no lockup right?

Well the other day I was driving, takeing a long sweeping curve downhill at about 90 km/h. There was an unexpected stop in traffic and I had to break quite heavily. Ie plant the breaks. The front wheels locked up for about a second. I assumed that going downhill, the added weight on the front disks overpowered the ABS system and it took a breif second before it engaged? Is this likely? Ive never had any ABS lights come on, and breaking generally seems fine, but this one time got me thinking about ABS effectiveness.


ABS does not lock up at once, it will basically lock/let loose/lock/let loose/lock/let loose.... maybe not even lock but brake heavily

ABS does not lock up at once, it will basically lock/let loose/lock/let loose/lock/let loose.... maybe not even lock but brake heavily

This is pretty much what it does, therefore the most effective way to brake hard is to hit the brakes and hold just before the ABS kicks in....

/highjack :P

I have a question about the effectiveness of ABS actually. If you SLAM the breaks in gravel, in theory there should be no lockup right?

Well the other day I was driving, takeing a long sweeping curve downhill at about 90 km/h. There was an unexpected stop in traffic and I had to break quite heavily. Ie plant the breaks. The front wheels locked up for about a second. I assumed that going downhill, the added weight on the front disks overpowered the ABS system and it took a breif second before it engaged? Is this likely? Ive never had any ABS lights come on, and breaking generally seems fine, but this one time got me thinking about ABS effectiveness.

yeah ABS doesnt kick in until a wheel locks, as soon as that happens it goes to work, so yeah sometimes it will lock for a tick before it works again

BlackD - ill look at what your talking about when i get home

I have a question about the effectiveness of ABS actually. If you SLAM the breaks in gravel, in theory there should be no lockup right?

Well the other day I was driving, takeing a long sweeping curve downhill at about 90 km/h. There was an unexpected stop in traffic and I had to break quite heavily. Ie plant the breaks. The front wheels locked up for about a second. I assumed that going downhill, the added weight on the front disks overpowered the ABS system and it took a breif second before it engaged? Is this likely? Ive never had any ABS lights come on, and breaking generally seems fine, but this one time got me thinking about ABS effectiveness.
abs is not designed to work on loose surface only hard roads

Ok thanks for clearing that up. The wheels only locked for a breif period of time, it was probably less than a second, I guess it just felt longer.

I don't know about your model, but TS has charge light and abs light in circuit. When my alternator went I spent 3 hours checking ABS then found it was alternator. Suggest you check charge rate of alternator for starters or get wiring diagram and check if abs and charge are on same circuit. Perhaps it is coincidental that light goes out after hard braking. Later I had the charge light come on also.

It is possible to 'catch out' ABS under certain conditions, but lock up on hard surface will be short lived. Also abs does not work below a certain speed (10 kph???), else you might never stop.

abs is not designed to work on loose surface only hard roads

not true at all, it is significantly more difficult to make ABS work on loose surfacts then roads obviously, but car designers have designed them to do the job. I hit mine on gravel surfaces and it works perfectly fine with only a momentary lockup

abs is not designed to work on loose surface only hard roads
Bullocks.It is designe to prevent lock-ups.Regardles of the surface.

In my brothers old verada he slammed the brakes on in the wet and it locked up for about 5 secs and we tapped the car in front of us on the bum, no damage though!!

abs is not designed to work on loose surface only hard roads

ABS works by using a notch sensor....

Basically, inside the disc there is a round section that is attactched to the disc.

Kinda looks like TT_T_TT_TT_TT_TT_TT_TT_TT just for an example but goes round in a full circle.

Theres a sensor that when the wheel goes round everything is fine. If we take for example, that the top of the notch reads as a 1, and the groove reads as a zero, then when the wheel is rotating as normal the sensor is reading

1-0-1-0-1-0-1-0-1-0-1-0-1-0-1-0-1

But if the wheel locks up it's gonna read 1-0-1-0-1-1-1-1-1-1-1-1

If it reads this, it will disengage the brake, and hence the wheel will start to turn again ;)

therefore the sensor will read 1-0-1-0-1-0-1-0-1 again. Let the brake back on, and because of the presseure you're applying, it will lock up again... hence 1-0-1-0-1-1-1-1-1...

And then disengage the brake again and yeah... I think you get the idea.. Therefore, what surface the wheel is on means four fifths of the cube root of **** all ;) :D

ok if thats what you think .............abs systems are for the road not off.....if your on a dirt road and need to stop in a hurry a car will stop quicker without abs....the reason is when your tyre locks on dirt with out abs it forms a chock of dirt in front ot the tyre...when u have abs it locks then lets go when this happens your driving over the mound of dirt or gravel inwhich you will travel further

ok if thats what you think .............abs systems are for the road not off.....if your on a dirt road and need to stop in a hurry a car will stop quicker without abs....the reason is when your tyre locks on dirt with out abs it forms a chock of dirt in front ot the tyre...when u have abs it locks then lets go when this happens your driving over the mound of dirt or gravel inwhich you will travel further

No sh!t!! A car will always stop quicker without ABS.... :nuts:

ok if thats what you think .............abs systems are for the road not off.....if your on a dirt road and need to stop in a hurry a car will stop quicker without abs....the reason is when your tyre locks on dirt with out abs it forms a chock of dirt in front ot the tyre...when u have abs it locks then lets go when this happens your driving over the mound of dirt or gravel inwhich you will travel further
Its not what he thinks,it is the way the ABS works ON and OFF road,so he is right.Now when you lock up in dirt (your words btw) if its a wet dirt you'll become a passenger,in dry because your car isnt equipped with off-road tyres instead of digging in they'll skid so you'll become a passenger again anyway (unless your speeding heavy car is equipped with a bar-long shovel :badgrin:) so your "chock of dirt" theory is out the window already.ABS isnt designe to stop your car quicker,its designe to give you :nuts: MORE control so you CAN prevent accidents or damage to yours/others property IF you can remember the steering wheel :bowrofl: .

who gives a crap whether it works on gravel or not
as long as it stops the friken car isnt that good enough?

who gives a crap whether it works on gravel or not
as long as it stops the friken car isnt that good enough?
ABS can actually be more dangerous to an unskilled driver when engaged on gravel/unsealed roads than non ABS braking systems, so it is relevant and worth being aware of.

Most peoples natural reaction when they cant get traction to stop the car is to press harder on the brake... this can be much worse, especially in this situation.

Did you try a handbreak burnout before the light came on?

any that knows anything about off road driving would know that abs is dangerous when driving on gravel or dirt yes its great on roads but will take longer to stop on dirt thats all im saying.....most 4x4s have a switch to turn it off or it will turn off automaticly