brian47
Well-Known Member
Sounds like ABS to me too. There's one place not far from where I live where there's a bit of tarmac filling a trench across the road, and it's just as the road approaches downhill to a roundabout. If I don't take my foot off the brake at that point, the little bump in the road is enough to trigger the ABS, immaterial of the weather.
What gives you the idea that a light should come on when it activates? If the light on the dashboard associated with the ABS does come on it usually means you have a problem.
What gives you the idea that a light should come on when it activates? If the light on the dashboard associated with the ABS does come on it usually means you have a problem.
brian47
Well-Known Member
If you're of "the old school" before anti-lock braking, there was a technique which was learned rather than taught called "Cadence Braking". This was a method of applying the brakes in short sharp stabs so that the wheel were given a chance to restart rotating if one or more had locked and was skidding.
ABS takes that technique and has automated it as well as increasing the speed of braking force application. It will feel like a vibration under your brake pedal while the brakes are being applied and released very rapidly. I have looked to see if I can find out the actual application rate but there doesn't seem to be any information, suffice to say that the best way to describe it verbally is "Brrrrrrrrrrrrrr".
The traction control and the hill descent system are also under control of the ABS system too.
ABS takes that technique and has automated it as well as increasing the speed of braking force application. It will feel like a vibration under your brake pedal while the brakes are being applied and released very rapidly. I have looked to see if I can find out the actual application rate but there doesn't seem to be any information, suffice to say that the best way to describe it verbally is "Brrrrrrrrrrrrrr".
The traction control and the hill descent system are also under control of the ABS system too.
Bobdog
Well-Known Member
Can you describe under what conditions/situations this happens?
jamesmartin
Well-Known Member
no but the traction control light would if it was activating, the pump does have an odd noise
neilly
Well-Known Member
Bobdog
Well-Known Member
Well ABS feels almost like intermittent 'brake failure' and a definite thump, thump through the pedal (which can seem unnerving as it won't let you brake as hard as you would like to) and as Brian said, TC is like a "brrrrrr" but the light would come on. If it's more of a vibration under steady braking it could be a warped disc but then again, that would happen every time you braked.
