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Abs problem
#1
Hi I have a 2011 berlingo 1.6hdi. The past week I've been getting an intermittent sort of pulsing when I brake and the past few days the abs light and warning tone has been coming on intermittent also. Any ideas? Would it be worth cleaning the senor. Cheers
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#2
I've had this before - there are a few threads on ABS if you have a look. Best to use a code reader if you can to identify which wheel. Then have a good look at and a clean up of the connector where the sensor plugs into the vehicle harness. A good proportion of my problems have been related to bad connections.
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#3
Hi ok thanks for the reply. I'll try and get it on a code reader and see where to start. Cheers
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#4
Just a quick note - I'm betting the problem is a front wheel. If you can't get to a code reader which reads the abs system, you could always clean up both front connectors. They're easy to get to, tucked behind a section of the inner plasic wing.
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#5
A pulsating pedal is often caused by an interruption of the signal from the sensor.
As said, the front ones are prone to picking up debris as they are exposed to the elements.
A common issue is the driveshaft gaiter clip breaking and the clip spins around randomly with grease coming out all over the place. Very easy for the signal to get interrupted.
Just turn your wheel on lock & take a look , you will usually spot this problem easily.
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#6
Or if it has abs rings on the driveshafts the ring has a layer of rust under it which expands and cracks the ring, the pulsing you feel is the wider gap at this point where it’s cracked as it thinks for a split second the wheel has locked

Ive also known rears on the likes of 307’s have a similar fault code mentioning coherence for a rear wheel on planet and lexia

Basically it can’t read one wheel speed correctly as it compares all four and steering angle to determine if the wheel speeds are correct
[-] The following 1 user says Thank You to dumdum for this post:
  • Art b
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#7
Start by checking for worn discs / pads .... could simply be that, I had it a while back.
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#8
A B9 from 2011: I bet on a one of the lead wires to one of the back wheels that is corroded on the inside and broken (or about to) where one of these cable ties fixes the lead wire to the chassis... Smile - This was the problem of my Pug Tepee from 2011, one year ago.
[-] The following 1 user says Thank You to Luis Rosa for this post:
  • Art b
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#9
(03-12-2018, 06:02 AM)Luis Rosa Wrote:  A B9 from 2011: I bet on a one of the lead wires to one of the back wheels that is corroded on the inside and broken (or about to) where one of these cable ties fixes the lead wire to the chassis... Smile - This was the problem of my Pug Tepee from 2011, one year ago.

Generally that gives a sensor fault for open circuit or short circuit to positive, and not a pulsing pedal at low speeds which is a speed sensor not reading momentarily
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#10
(15-12-2018, 08:54 PM)dumdum Wrote:  
(03-12-2018, 06:02 AM)Luis Rosa Wrote:  A B9 from 2011: I bet on a one of the lead wires to one of the back wheels that is corroded on the inside and broken (or about to) where one of these cable ties fixes the lead wire to the chassis... Smile - This was the problem of my Pug Tepee from 2011, one year ago.

Generally that gives a sensor fault for open circuit or short circuit to positive, and not a pulsing pedal at low speeds which is a speed sensor not reading momentarily

Mine did pulsate the pedal...when the wire was not yet fully broken and the ABS alarm was not permanent. When it broke completely, then It did not anymore. And by then the ABS and ESP light was permanent.
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