abs problems

[rob66]

hi there ,i am new to the site but not the cars i have had two the first was a 51 plate lwb 2.7tdi sport which i had from new for 9 years then i had a terracan for two years but i have just replaced that with a w plate 2.7tdi se lwb , i have got the generic brake problem again that i had on the 51 plate it happens like this ... if the abs light is on the brakes operate fine but with no abs if the abs light goes out the abs operates intermittently in normal road conditions and the brakes disappear as you press the pedal , you can hear the abs unit working as if the wheels are locked but they are not , i checked the pink wire at the back of the intercooler identified in other forums but that seems ok also the auto hubs are grinding / whinning and tugging all over the place so i am going to change them to manual hubs from milners , the brakes are the real issue so any other ideas please !!!

[rayf3262]

Could be an intermittent connection (fractured wire) on one of the sensors.

while you are checking the hubs, check the drive shafts have the circlips fitted as if the shaft is allowed to float, the reluctor ring can move away from the sensor.

[rob66]

thanks for that ,when you say circlip do you mean the one that is before the two washers and locking ring or the one that holds the cv joint in place ? got a feeling this thing is going to end up in a thousand pieces before long !! as reading through the posts i think i have a dozen at least of all the common faults !!
although shunting a trailer full of bricks didnt help its pretty face either !! still insurance company are going to repair????? bumper ,headlight grille !!!!