[Brakes] Intermittent ABS Alarm

[Nice4dad]

Hi Guys,

I have an ABS alarm that triggers after about one hour of driving. Just appears when driving along on a motorway, but only sometimes. It also clears irregularly. My code reader wouldn't pick this type of alarm so have ordered a lexia. 

I've checked the brake fluid which is fine. 

Prior to the arrival of the code reader does anyone have thoughts on what it might be?

[Oi69]

Hi Guys,

I have an ABS alarm that triggers after about one hour of driving. Just appears when driving along on a motorway, but only sometimes. It also clears irregularly. My code reader wouldn't pick this type of alarm so have ordered a lexia. 

I've checked the brake fluid which is fine. 

Prior to the arrival of the code reader does anyone have thoughts on what it might be?

Broken wire on 1 of the sensors or a cracked abs ring i dont know if they are on berlingos

[Nice4dad]

Have loaded Diagbox 7.02 onto an old xp computer. Read the codes, its the front offside sensor reporting a fault. The wiring looks OK but can't get the sensor out as the torx screw is stuck in. In danger of rounding the screw hole. Left it with a liberal dose of WD40. May have to get the Dremel out.

[Oi69]

dont just look at the sensor wire check the plugs and where it goes into the body work give it a good wiggle see if light goes on and off if looks good repalce sensor

[Boxer]

My previous abs problems have been down to bad connection where abs sensor plugs into the main harness under the wheel arch. Try a clean up and spray in some contact cleaner. Cheap and easy, may work.

[Luis Rosa]

I just had a similar thing hapenning with one of the rear sensors...It ended up being a cable from the main harness, broken where a cable tie held it to the chassis, just after the plug to the sensor...

[Nice4dad]

Hi Guys,

Update: Before taking to the garage had another look at the wiring it looked fine. Tested with an Ohmmeter and had steady readings with both directions. The garage welded a nut onto the remaining portion of the bolt and removed it. Unfortunately a new sensor didn't solve the problem and a new hub bearing (integral encoder) was needed. All fine now.