ok i give up, have a 2008  4x4  6 speed estate {ex police}  where is the brake light switch?????, have checked around the pedal nothing, have looked and felt around master cylinder,with great difficulty i might add, again no switch to be seen,

any ideas 

It is on the master cylinder it has a 4 pin connector and bolts onto the front of the master cylinder

Between my ageing eyesight and the complexity of these vehicles I am finding more and more things and doing many jobs by touch these days.

 

Wont be long before we will be able to buy a finger thimble with a built in low light wi-fi camera if it doesnt already exist.

 

I bet they make them to fit on the bell-end first, probably a bigger and more eager market

believe me there is nothing bolted onto this master cylinder, unless it is cloaked :-)

 

That's from the dealer manual 

Photo stolen from an ebay listing:

 

Surely the brake switch is at the far end of your brake pedal under the dash!? It activates when you push the brake pedal, the other side of the pedal comes away from the switch.... 

11 minutes ago, Ardle said:

Surely the brake switch is at the far end of your brake pedal under the dash!? It activates when you push the brake pedal, the other side of the pedal comes away from the switch.... 

On the MK1 it was, but for some reason they moved it to the MC on the MK2 

13 hours ago, nige8021 said:

On the MK1 it was, but for some reason they moved it to the MC on the MK2 

 

Not all models. Mine's a 2005 2.0 Tdi Elegance and the switch is on the pedal assembly. 

Probably depends whether the car has cunning systems where the brakes can be applied without input from driver's foot.

1 hour ago, Wino said:

Probably depends whether the car has cunning systems where the brakes can be applied without input from driver's foot.

 

ABS and TCS do that don't they? Do on my car. 

Just now, Golf-Fiend said:

 

ABS and TCS do that don't they? Do on my car. 

 

Only if the brake pedal is pressed first.

1 minute ago, Wino said:

 

Only if the brake pedal is pressed first.

 

TCS does that without any pedal input via the ABS pump unit

I guess maybe the brake lights don't come on in those circumstances then.

 

More the case of if the servo can be actuated without pedal action, I guess.

Edited 7 June, 20196 yr by Wino

1 hour ago, Golf-Fiend said:

TCS does that without any pedal input via the ABS pump unit

 

TCS is normally done by reducing engine power output rather than using the brakes.

 

If you have a MK70/MK70m ABS pump, it cannot apply the brakes for you. It can only modulate the braking power. These support ABS and TCS/ASR.

 

If you have a MK60/MK60EC1 ABS pump, it can apply individual brakes without needing the driver to apply the brakes. These also support  ESC/ESP and a whole selection of other technologies...

 

What pump would my vehicle have Langers? I cant go out and check because I am doing a battery drain test and dont want to awaken the Canbus.

 

I absolutely hate the traction control on this MK2 compared to my MK1, it just cuts engine power and leaves you stranded, the MK1 would brake the opposite wheel directing torque to the one with grip as well as modulating the engine power, it was noisy and harsh but did a good job. The current vehicle will not pull away on fresh snow on a level car park, I am a maestro in getting  bogged down older generation vehicles out of mud, snow etc but am hamstrung when there is no engine power.

 

If I were able to change the pump and controller to give the differential braking during loss of traction I would do it in a heartbeat at whatever cost.

 

But can it be done?

From your autoscan https://www.briskoda.net/forums/topic/467619-fault-code-city-on-a-mission-to-remove-them-all

 

 

The ABS pump info is:

Address 03: ABS Brakes        Labels: 1K0-907-379-MK70.lbl
   Part No: 1K0 907 379 P
   Component: ASR FRONT MK70      0105  
   Coding: 0017025
   Shop #: WSC 73430 790 00000
   VCID: 3FDB40F80B78801FA77-806A

No fault code found.

 

So it's a MK70 which doesn't support EDL (electronic diff lock).

 

I replaced a MK70M for a MK60EC1 but had to create a wiring adaptor as they have different connectors (26 vs 47 pin) and provide an extra power feed.

 

I know other people have done MK60 to MK60EC1 but that's requires more work as some brake lines changed fittings too. Not sure what's involved for a MK70 to MK60 or even MK60EC1 but it's probably quite similar. I'm sure that some people have had to replace their instrument cluster at the same as changing the ABS pump but I don't know the details.

I still dont get why they downgraded something from the MK1 to the MK2 unless became an upsold enhancement.

 

I would be up for changing the pump, is the controller built in?

 

But if it means changing the instrument cluster its the complication more than the expense that concerns me given that mine already shows up a defective fault code.

 

I take it the the "electronic diff" has nothing at all to do with the diff, just differential braking? When fitted on later cars is it harsh like it was on my MK1? It would only graunch when pulling away from a standstill, never when wheelspin crept in on a wet uneven uphill road surface. Maybe the noise was something else complaining, possibly the diff itself, it never got any worse over 13 years.

It'll almost certainly be down to cost.

 

The control module and pump are one unit. The MK60EC1 has the acceleration sensors built in but a MK60 has them in a extra, separate control module.

 

Yup, in this case the EDL is literally just using the brakes to simulate a diff lock

I will look into it as an upgrade project, driving it on the one snowy day we had last year was a terrible dissapointment.

 

So I will need an MK60 pump and module or an MK60EC1, maybe some brake lines, anything else?

 

Dont suppose these pumps were fitted to the MK1 were they?

According to my last scan on my MK1 it has the MK60 unit and that ties up with the PR code that said it has EDL 

On 06/06/2019 at 18:32, nige8021 said:

On the MK1 it was, but for some reason they moved it to the MC on the MK2 

 

Reliability. Changed from a physical open/closed switch to a Hall effect magnet. 

10 hours ago, J.R. said:

So I will need an MK60 pump and module or an MK60EC1, maybe some brake lines, anything else?

 

A new connector wired as per the factory wiring diagram (with extra power feed) and probably a new bracket to hold the new ABS module. Worth double checking some part diagrams.

 

If possible, I'd be tempted to go for the MK60EC1 rather than the MK60. Pretty sure there are some common issues with the MK60, something about a G201 internal pressure sensor if I remember correctly: https://www.briskoda.net/forums/topic/174385-esp-abs-g201-failure-teves-mk60-list/

 

Yes I have been reading through some of your previous contributions on the subject!

 

What "brain" makes the decision to brake the opposing wheel in response to all the sensor inputs, wheel speed, vehicle speed, steering angle, throttle opening etc, is it the ABS module or the ECU or something else on the can bus network?

 

I realise the ABS module does the doing but I want to be sure that my vehicle will do the commanding or its a waste of time fitting one. I presume something somewhere will need coding.

 

Read on one of your postings about changing the switch from ASR to ESP or vice versa, what is the difference between the 2 and what do I have at present? I will look when I go out to the car.

On 07/06/2019 at 10:46, Golf-Fiend said:

 

TCS does that without any pedal input via the ABS pump unit

 

So if I feel the ABS pump kicking in when I got wheelspin as I did in the snow/slush earlier this year, then what system do I have? The bottom on the dash says ASR.