P38A Disco 2 hubs on a P38

[aaronparke1]

Hi all,

So, clunking when on full lock led me to decide to replace the front CVs on my 2000 P38 4.6.
This led me to discover my hub bearings were knackered and the drums on the back of the hubs that the abs sensor picks up from were shot too.
Oh, then, of course I found my front prop ujs were needing replacement.

So, I read that disco 2 hubs fit and promptly bought a pair. Unfortunately they don't have the drum on the back so I used the disco abs sensors going that they would work.
Now I have both abs and traction faults.

So, should this set up work and it's simply a case of having the faults cleared or are disco sensors incompatible?

Do I now need to find two new P38 hubs and swap them out for the disco units?

Advice would be much appreciated.

Cheers.

 

[kermit_rr]

I guess it depends if the reluctor ring has the right number of pulses and if the sensor gives the correct voltage

 

[aaronparke1]

I guess it depends if the reluctor ring has the right number of pulses and if the sensor gives the correct voltage

I guess my question is who has already been here and what was their solution?

 

[marjon]

I guess my question is who has already been here and what was their solution?

I guess the bigger question is why did you get disco hubs when you own a p38 .

J

 

[aaronparke1]

I guess the bigger question is why did you get disco hubs when you own a p38 .

J

Because they were much cheaper and I believed they would fit and work.

 

[Datatek]

Because they were much cheaper and I believed they would fit and work.

Looks like an expensive mistake. Hub bearings can be replaced.

 

[pwood999]

I guess it depends if the reluctor ring has the right number of pulses and if the sensor gives the correct voltage

Wrong number of pulses would make the speedo wrong, plus front & rear wheel mismatch. ABS fault implies the sensor cannot see the reluctor.

Looks like an expensive mistake. Hub bearings can be replaced.

Definitely. Supplier might have swapped them for P38 version if they were unused, but probably not now.

My guess is the sleeve on the P38 one is probably to keep dirt out of the reluctor ?? CV Joints look completely different as well, so I cannot see P38 joint working with Disco hub, or vice versa !!

 

[kermit_rr]

Wrong number of pulses would make the speedo wrong,

I understood the ecu used a truncated mean across all 4 wheels, which is why the speedo is still correct when a sensor fails

 

[pwood999]

I understood the ecu used a truncated mean across all 4 wheels, which is why the speedo is still correct when a sensor fails

ok I stand corrected. I do wonder how it would behave if the disco sensors did provide pulses, especially if the front & rerar rate per revolution were different ? I guess the ABS/TCS would treat it as spinning or slipping wheels - a bit like it does in gear with all four wheels off the ground.

 

[Grrrrrr]

ok I stand corrected. I do wonder how it would behave if the disco sensors did provide pulses, especially if the front & rerar rate per revolution were different ? I guess the ABS/TCS would treat it as spinning or slipping wheels - a bit like it does in gear with all four wheels off the ground.

Yes, an incorrect signal rather than absence of signal might mess it up.

 

[kermit_rr]

Yes, an incorrect signal rather than absence of signal might mess it up.

I had a split reluctor ring for a while. Speedo was fine but at low speeds when i touched the brake, the abs would energise

 

[Grrrrrr]

I had a split reluctor ring for a while. Speedo was fine but at low speeds when i touched the brake, the abs would energise

A split ring is always going to cause trouble sooner or later.

 

[aaronparke1]

Wrong number of pulses would make the speedo wrong, plus front & rear wheel mismatch. ABS fault implies the sensor cannot see the reluctor.

Definitely. Supplier might have swapped them for P38 version if they were unused, but probably not now.

My guess is the sleeve on the P38 one is probably to keep dirt out of the reluctor ?? CV Joints look completely different as well, so I cannot see P38 joint working with Disco hub, or vice versa !!

View attachment 344466	View attachment 344467
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They do work, they fit just as the P38 hubs it is just the sensory issue.

The old hubs were knackered so it wasn't an option to just replace the bearings, the reluctor rings were rusted through.

I have P38 hubs and fitted them. Now no ABD fault but I can't clear the Traction Fault. Anyone near me with software to clear this one?

I'm ST7 8BQ

 

[Datatek]

They do work, they fit just as the P38 hubs it is just the sensory issue.

The old hubs were knackered so it wasn't an option to just replace the bearings, the reluctor rings were rusted through.

I have P38 hubs and fitted them. Now no ABD fault but I can't clear the Traction Fault. Anyone near me with software to clear this one?

I'm ST7 8BQ

See your other post.

 

[Grrrrrr]

They do work, they fit just as the P38 hubs it is just the sensory issue.

The old hubs were knackered so it wasn't an option to just replace the bearings, the reluctor rings were rusted through.

I have P38 hubs and fitted them. Now no ABD fault but I can't clear the Traction Fault. Anyone near me with software to clear this one?

I'm ST7 8BQ

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