ABS module change

[the_db]

I believe my ABS module is faulty. I need to replace it but need some assistance....

My current unit is 5Q0 614 517 J 40k miles (2015 Leon Cupra 280 SC)

I can source a second hand unit from a newer and low mileage car 14k 2019 Cupra Lux 5dr - 5Q0 614 517 EF

I presume the unit will work, but am unsure if it will need some coding to be compatible. I have tried to find the exact same unit I already have but most are not from Cupra's or from high mileage vehicles and I thought a unit from a low mileage Cupra would work much better?

 

[cairus]

If you want, send me your chassis number and I will check what the official spare part is according to Seat

 

[the_db]

sent - thanks

I need to do a scan of the module on VCDS as well

 

[cairus]

5Q0907379AF REP

 

[the_db]

Thanks

Looks like that part is associated with 1.4 Leon

Is it likely it will work on a 2.0? I'd imagine the brake bias is the same accross all petrol Leon's but would the much bigger front brakes not make a difference?

Starting to wonder if sending my current unit off for test and repair is the best option.... albeit a faff.

 

[SuperV8]

5Q0907379AF REP

That part would be number 2 - a repair kit. Not number 1 "ABS unit with control unit"

 

[SuperV8]

Thanks

Looks like that part is associated with 1.4 Leon

Is it likely it will work on a 2.0? I'd imagine the brake bias is the same accross all petrol Leon's but would the much bigger front brakes not make a difference?

Starting to wonder if sending my current unit off for test and repair is the best option.... albeit a faff.

I can see at least 11 part numbers for ABS modules - each linking to different PR codes. I doubt they would do this unless there was a technical reason?
I can't see any 'supersession' of part numbers - so I would think there is more than just a software change?

You can code the brakes module for larger brakes - which is what you should do if you went from a 288 to 312 disc for example.

 

[cairus]

I looked for the part based on the chassis number. Then I misinterpreted it. An error log extract would be helpful. It doesn't really matter, because used cars usually come with the block.

 

[the_db]

I'll get some logs when I get home from work.

I am wondering if the issue could be brake booster/master cylinder related vs ABS module as well but was going to replace both at the same time....

Physical Issue:

Brakes fully bled no air
Pedal is soft and you have to ram it to the floor to physically hold the brakes and stop the car from creeping forward.

Not sure if worth adding but running 380mm Revo BBK (6 piston Alcons)

 

[SuperV8]

I'd be looking at master cylinder first I think - much cheaper than anything ABS module related.

 

[mty12345]

I'd bee looking at master cylinder first I think - much cheaper than anything ABS module related.

Agreed, I don't see how the ABS module would affect the pedal like that.

 

[the_db]

So I realised the master cylinder was the wrong type (TRW vs ATE). I assumed (wrongly) that TRW made after market master cylinders (as they make after market parts for just about everything else!) but it transpires there is a TRW and a ATE variant of the master cylinder. I have today fitted a new ATE unit.
Brake pedal now goes straight to the floor but I have yet to re-bleed the brakes as I need an able assistant for that job!

I have now got 2 fault codes, and imo neither suggest a defunct ABS module (thank god).

C10A301 - Vacuum Sensor
U112100 - Databus missing message

I have had to replace the vac hose itself that runs from the brake booster after it melted/caught fire (long story) so am now thinking that perhaps the brake vacuum sensor failed as a result of said fire/or was a contributing factor to the cause (again long story!). I am hoping the databus error is because of the faulty sensor and information not being received correctly or at all from it.

I have ordered a replacement sensor 5Q0906207B. I am hoping replacing that, plus another brake bleed will resolve my issues!