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Old January 27th, 2014, 05:04 PM   #1
BlooMule
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Default Lockers and ABS

After driving in the slop we've had lately, and feeling the ABS kick in a time or two- I got to wondering.....


If you have a locker in either axle (or both) does it mess up the anti-lock brakes? Seems to me if you are in 4WD and have a locker, that newer ABS that controls wheels independently may not like it. I don't know much beyond the basic idea of how ABS functions, so maybe those that know can answer...
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Old January 27th, 2014, 05:55 PM   #2
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Generally ABS works on the principle that if one wheel is moving faster then the other during breaking it must be slipping and it applies ABS to that corner until all wheels are moving at the same speed.

Some rear axles only have one rear sensor and the ABS pulsates both rear breaks during breaking.

So, if you were taking a turn with lets just say a spool. Then brake'd with one of the wheels moving faster the ABS would kick in. If you had a single sensor rear axle it would pulsate both rear breaks and could cause a slide. With 4 speed sensors at the hubs it would pulsate the single wheel moving faster breaking it. You would have a shaft vs rotor situation which could cause increased break wear.
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Old January 29th, 2014, 09:53 PM   #3
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Originally Posted by cerial View Post
Generally ABS works on the principle that if one wheel is moving faster then the other during breaking it must be slipping and it applies ABS to that corner until all wheels are moving at the same speed.

Some rear axles only have one rear sensor and the ABS pulsates both rear breaks during breaking.

So, if you were taking a turn with lets just say a spool. Then brake'd with one of the wheels moving faster the ABS would kick in. If you had a single sensor rear axle it would pulsate both rear breaks and could cause a slide. With 4 speed sensors at the hubs it would pulsate the single wheel moving faster breaking it. You would have a shaft vs rotor situation which could cause increased break wear.
Actually, if a wheel is moving faster than the other during braking then the other wheel is locked up, which would cause ABS to cycle that wheel, not the one that's moving faster.

If a wheel is moving faster than the other during acceleration, then it is slipping/spinning.
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Old January 30th, 2014, 07:57 PM   #4
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Originally Posted by cerial View Post
Generally ABS works on the principle that if one wheel is moving faster then the other during breaking it must be slipping and it applies ABS to that corner until all wheels are moving at the same speed.

Some rear axles only have one rear sensor and the ABS pulsates both rear breaks during breaking.

So, if you were taking a turn with lets just say a spool. Then brake'd with one of the wheels moving faster the ABS would kick in. If you had a single sensor rear axle it would pulsate both rear breaks and could cause a slide. With 4 speed sensors at the hubs it would pulsate the single wheel moving faster breaking it. You would have a shaft vs rotor situation which could cause increased break wear.

If you have a spool how would one of the wheels turn faster than the other?
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Old January 30th, 2014, 08:56 PM   #5
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If you have a spool how would one of the wheels turn faster than the other?
When you break something!
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