Here we go again.... ABS light not working

[V8 Disco]

Hm. Our recently acquired Disco is playing up again.... The dealer has (again) said he will sort it, but natural curiosity leads me to ask here if anyone has any ideas - the ABS warning light never lights at any time. IIRC, it's supposed to come on with ignition, blink once, then stay illuminated till the vehicle reaches 5 mph. It was working ok when we test drove and I think must have worked for MOT. It may be significant that follwing an initial MOT fail - negligible rear brake performance - the balance valve was replaced and the system bled. Subsequently passed MOT. Could this have triggered the problem?

Any wisdom gratefully received!!

[ledaig]

No idea about the fault, but you do remember correctly about its 'double' test - I thought mine was knackered when I got it 'till I read the manual.

Would have thought this should 'fail safe' though and go to permanently on rather than off (bulb?).

Steve

[Trooper2]

Sounds like the bulb is burned out.

[XJSJohn]

FWIW .. my rangie (same basic system i believe) ABS light will come on with ignition on. It will then not go out till 5mph or has been running for a little while.

May be just that the computer was not reset after the work done to the brakes.

I know that i had an airbag fail light on my dash for ages after i hoiked the battery out to jumpstart something else. reset of electrics solved the problem.

(that or the bulb has gone)

[red dwarf mode]
Rimmer - Kryton, upgrade to RED ALERT
Kryton - But ... But Sir, that does mean changing the lightbulb!! [/red dwarf mode]

[V8 Disco]

Just a quick update - took Disco out in the snow, and the ABS works perfectly.. so must be the warning light bulb in the dash - my thinking is: The ABS shuts down completely if there's a fault, so if the system is working, then there cannot be a fault.

Haynes says that I must disconnect the battery before pulling the instrument panel to change the bulb - is this really necessary? Maybe they are just being extra cautious?

Regds.

[talkwrench]

No, not necessary as long as you are reasonably cautious and have the ignition turned off.
Haynes are always over cautious. They probably suggest disconnecting the battery before opening the bonnet....