Over senistive ABS

[bangernom1cs]

HI,

These do fail quite regularly on the taxi fleet...or the abs kicks in at very low speeds (5mph or less)
I looked at my ring (ooer!) but couldn't spot any breaks etc but still get this particularly on grids/manholes.
Some cars seem more sensitive than others the lads tell me
Mine also kicks in at very low speeds so I'm hoping its only a sensor fault somewhere even though they've all been cleand twice infact .
As a temporary measure, disconnect the grey plug towards the bulkhead on the ABS motor.
You still get the ''ABS defective'' signal on the dash and then you revert to an early 1.9 D8 braking system
which works perfectly apart from the ABS bit of course. I've had to do this recently.
I'm also told that the sliding bush arrangement on rear calipers can cause also this to happen as they get stiff quite regularly.Why..I do not know, perhaps an imbalance in the fluid pressures freaking ot the ABS brain?
When mine was doing this, it was on the rear right and I did notice that the sliding bush seemed much stiffer than normal and was put off until the next inspection as it had just passed the MOT anyway but probably on one pad I guess?
The garage changes a lot of rear discs with normal wear on the outside face but terrible rust/scores on the rear unseen face.I also had this problem when I fitted new front and rear discs for the taxi test. (it passed two MOTs on braking but the taxi test failed all the discs???????)
This is my next job to look at when servicing this week. Will keep you posted.
For the record;
I taxied up to 200k on my early N reg. 1.9 non- ABS rear drummed with no braking problems quite frankly.
On a later S reg. 1.9 D8 with ABS and rear drums(features in the sloshing sills thread) it still runs today with over 440k and NEVER had an ABS problem. However it did have a new N/S shaft at 256k but the original RH shaft remains with occasional new boots still.
Its worth noting that if you take out the guide pins on the front calipers occasionally then clean and grease them up
makes wonders in the 'braking feel' department.
Water does get in to these past the rubber boots and consequently stiffen up and cause problems. I had to change one on the Nreg and all on a low mileage main dealer maintained 405 years ago.

Regards
Tony

Tony

[jibz]

I've got similar probs with my ABS, mine would work fine this minute and when u needed it most it would be rock stiff, nearly ran over a family member of mine. had to disconnect it . Even scared to get it fix

[mjb]

I've got similar probs with my ABS, mine would work fine this minute and when u needed it most it would be rock stiff, nearly ran over a family member of mine. had to disconnect it . Even scared to get it fix

That sounds like a problem with the servo (probably a vacuum leak), not an ABS fault.

[jibz]

That sounds like a problem with the servo (probably a vacuum leak), not an ABS fault.

Vacumm Leak?? Hmm... I think I'll explore that option. Thanks