ABS or no?

Hi I have a 96Disco 300tdi auto. I notice that the fuse holders for abs are
all populated but the brake booster does not look sufficiently complex to be
abs capable, and the three lines coming out of it, scoot across the firewall
to a widget that sits on the front left wheel arch - again this does not
look like an ABS pump.

So the killer question? Do I have ABS?

Regards
Stephen

PS: I have not had cause to brake heavily to enough to lock any of the
wheels, and have not had it off road enough to lift wheels while braking
yet- although I would have this weekend but my wife complained that young
craig's (2 weeks old) neck was not strong enough to handle the bouncing I
was contemplating. A tricky bit in a game reserve that they used to try and
convince potential ToeRag customers that it was a good vehicle.

On or around Fri, 15 Oct 2004 10:04:36 +0200, "fanie"
<[email protected]> enlightened us thusly:

>Hi I have a 96Disco 300tdi auto. I notice that the fuse holders for abs are
>all populated but the brake booster does not look sufficiently complex to be
>abs capable, and the three lines coming out of it, scoot across the firewall
>to a widget that sits on the front left wheel arch - again this does not
>look like an ABS pump.
>
>So the killer question? Do I have ABS?
>

very likely not. The ABS system has a modulator unit which has 8 pipes
going into it (supply and return from each wheel) and an electric return
pump, I think. This thing is apt to be under the bonnet somewhere, and
probably hard to miss.

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around Fri, 15 Oct 2004 10:04:36 +0200, "fanie"
> <[email protected]> enlightened us thusly:
>
>>Hi I have a 96Disco 300tdi auto. I notice that the fuse holders for abs
>>are
>>all populated but the brake booster does not look sufficiently complex to
>>be
>>abs capable, and the three lines coming out of it, scoot across the
>>firewall
>>to a widget that sits on the front left wheel arch - again this does not
>>look like an ABS pump.
>>
>>So the killer question? Do I have ABS?
>>
>
> very likely not. The ABS system has a modulator unit which has 8 pipes
> going into it (supply and return from each wheel) and an electric return
> pump, I think. This thing is apt to be under the bonnet somewhere, and
> probably hard to miss.
>
There's an easy way to check, find an empty slippery road and jam your
brakes hard on, You'll soon find out. The first time mine cut in it scared
the life out of me!!!

Peter.

fanie wrote:
> Hi I have a 96Disco 300tdi auto. I notice that the fuse holders for abs are
> all populated but the brake booster does not look sufficiently complex to be
> abs capable, and the three lines coming out of it, scoot across the firewall
> to a widget that sits on the front left wheel arch - again this does not
> look like an ABS pump.
>
> So the killer question? Do I have ABS?

Not familiar with the disco, but on most ( all? ) ABS systems there is a warning
light that should come on when the ignition is switched on. If it doesn't, then
either the bulb/fuse has gone, or there is no ABS fitted. I believe that if this light
does not work then it is an MOT failure, presumably to prevent people disconnecting
the light instead of fixing the ABS.

Nigel Worsley

The ABS modulator on the Disco sits on the front left wheel arch. That's
where it is in the Disco II as well.

"1. ABS Modulator unit
To provide the ABS function a Modulator is positioned
within the system between the master cylinder and the
calipers. On both LHD and RHD vehicles it is sited on
the left inner wing [fender]. The Modulator has 8
solenoid valves, 2 for each wheel, 2 expanders and a
recirculation pump. It is non serviceable."

"3. Pressure reducing valve
To maintain the braking balance, pressure to the rear
axle is regulated by a Pressure Reducing Valve (PRV)
This PRV is of the failure bypass type, allowing full
system pressure to the rear axle in the event of a front
circuit failure. It is sited on the left inner wing [fender]."


If the thing on the front left wheel arch has only 4 pipes and looks
cylindrical, then that is the pressure reducing valve. The Disco 1 ABS
modulator is fairly bulky and has a motor sticking out one end of it.

The brake booster looks normal on a Disco with ABS (entirely different to
Rangies with ABS).

Ron


"fanie" <[email protected]>

> Hi I have a 96Disco 300tdi auto. I notice that the fuse holders for abs are
> all populated but the brake booster does not look sufficiently complex to be
> abs capable, and the three lines coming out of it, scoot across the firewall
> to a widget that sits on the front left wheel arch - again this does not
> look like an ABS pump.

On or around Sat, 23 Oct 2004 09:07:35 +1000, "The Becketts"
<[email protected]> enlightened us thusly:

>If the thing on the front left wheel arch has only 4 pipes and looks
>cylindrical, then that is the pressure reducing valve. The Disco 1 ABS
>modulator is fairly bulky and has a motor sticking out one end of it.
>
>The brake booster looks normal on a Disco with ABS (entirely different to
>Rangies with ABS).

Odd that the disco I is different; I'd expect it on disco II, since it's
known to be a different ABS which will work at low speeds, to operate the
HDC.

the one on the Rangie is, AFAIK, similar to the one on my ford sierra, which
has a pump to pressurise the brake fluid and no actual brake servo at all.