Hello,
As the title says, can anybody tell me where this piece is located.
What it is used for.

All i know about it is that it is used only on cars with ESP and it costs about 120 euro... so it is not just the regular brake switch behind the brake pedal.

In what context do you need to know, it might help us clarify what it is. Have you got a fault then

well I have a problem ..for almost a year now: hill holder gets stuck when it engages.

No garage has been able to figure out the problem.(including multiple dealers)
There are no errors.
i have even replaced he abs/esp pump assembly.
i have sunk so much money in trying to solve it, that i just will no longer just replace different parts on the opinions of different mechanics.

It is basically very difficult to diagnose something on the CAN network that does not throw an error code.
it could be any of the pieces connected to the CAN
-instrument panel
-body computer
-yaw sensor
etc...and none are cheap!


I seem to find the Bosch hidraulic presure switch on a lot parts web sites on the Fiat Bravo section.
But there is never a picture and i can not find it in the elearn application either.
so i am just wondering where it goes and if it can also be involved.

Other people would have cut there loses long ago. and sold it passing the problem to somebody else;

Just disable the hill holder when you know you're going to stop on a hill.

There should also be a way for a dealer to disable the hill holder permanently.

there is NO way to disable it, temporary or permanently ( without loosing ABS or ESP or without having error messages)

aurick86 said:

there is NO way to disable it, temporary or permanently ( without loosing ABS or ESP or without having error messages)

Click to expand...

How do you know this??

The ABS can be deactivated without issue, so it wouldn't surprise me if hill holder cannot. Failing that disconnect the gyrometer, you'll loose ESP also, but still keep ABS.

aurick86 said:

well I have a problem ..for almost a year now: hill holder gets stuck when it engages.

Click to expand...

please elaborate on what you mean by 'it gets stuck'

Doesn't hill holder turn off when you disable the ASR function?

Tad-bravo said:

Doesn't hill holder turn off when you disable the ASR function?

Click to expand...

Nope, only disables the ASR.

Most Easterly Pandas said:

How do you know this??

The ABS can be deactivated without issue, so it wouldn't surprise me if hill holder cannot. Failing that disconnect the gyrometer, you'll loose ESP also, but still keep ABS.

Click to expand...

So..basically you are saying i am right, remembrer : without loosing ABS or ESP or without having error messages.

If i wanted a hack job to disable the hill holder and have a instrument panel lit up as a Christmas tree, i could just cut some wires. That i snot what i am looking for.

if you use the handbrake instead what happens?

When i use the hand brake the hill holder does not engage.

That is the solution i am using at the moment o avoid engaging the Hill holder.

But there still are times like in low visibility uphill intersections where i have o use the clutch ...and if by some mistake i press the brake hard enough to reduce the speed to 0 then the Hill holder will engage and the brakes will stay engaged.. for a few good minutes ~10 minutes... or until some of the brake fluid is eliminated (bleed screws)

I know that if the handbrake is on (even he slightest) then the ESP will not engage...handbrake snow drifting anyone?
So just making a switch to make the body computer think that the hand brake is on would work.....

A better solution to the hill holder problem would be to by pass one of the inputs required to engage it ..the easiest would seem the brake switch...but still need to make sure the ABS /ESP and rear brake lights will work.

Maybe create a separate analogue circuit for the rear lights.. + maybe some resistors to keep the body computer from thinking the bulbs are out.

I am reluctant to do anything that would eliminate (stop from working) the ESP as it might just have saved my life a week ago.

Unfortunately i cannot spare more than a few hours to work on it every 4-5 weeks ..and the car needs to be functional during the week..so taking everything out.. and measuring/checking wires etc.. will still have to wait.

aurick86 said:

So..basically you are saying i am right, remembrer : without loosing ABS or ESP or without having error messages.

If i wanted a hack job to disable the hill holder and have a instrument panel lit up as a Christmas tree, i could just cut some wires. That i snot what i am looking for.

Click to expand...

No, re-read the first question. I'm asking how you know it cannot be deactivated as ABS can.

Second was a suggestion if it defo cannot be deactivated.

Do proper hill-starts like we mere mortals without hill holder have to do.
Practise makes perfect - and stop riding the clutch.

I know because its wired and programed into the ABS/ESP electronic module (Bosch ABS 8 VDC).
there is no switch or fuse for it separately.
As far as i have studied the schematics and the descriptions of the system there isn't even a single extra wire used only by the Hill holder.

The ESP module (electro-hydraulic pump assembly) receives the important information(like bake pedal status, and yaw sensor information ) through the CAN Network...so digital information, no longer can a simple multimeter be used; and sadly that part is beyond me.



Would love to be able to eliminate the hill holder, and be able to do proper hill starts, switching from the brake to the accelerator.. but if my foot is ever on the brake on a hill.. that will engage the hill holder.. so my two options are handbrake (not allays usable - i have an "uphill intersection with limited visibility with an odd angles" in mind), or riding the clutch (we all know why you should not do that,...and i do not like it)
Do not get me wrong.. I would like to have it working.

so i will ask my original question

what do you mean when you say hill holder wont release?

do you mean it drags for a few seconds?

do you have to stop and turn car off?

Hill Holder will not release = it engages the brakes.... but will not disengage. The brakes stay ON ...for 10-15 MINUTES or until i remove hydraulic pressure from the brake lines.

A friend has another friend with the same problem.. it seems he once removed the battery terminal (engine off) and it released immediate ...I have not yet tried that.

Next time it gets stuck try pushing the brake pedal as hard as you can until it drops slowly down. it should take a few seconds of constant pushing. Try that 2 or 3 times and see if it releases the brakes.

Charnwood Fox said:

Do proper hill-starts like we mere mortals without hill holder have to do.
Practise makes perfect - and stop riding the clutch.

Click to expand...

As much as I'd agree, it sounds like even doing that the OP is having issues.

aurick86 said:

I know because its wired and programed into the ABS/ESP electronic module (Bosch ABS 8 VDC).
there is no switch or fuse for it separately.
As far as i have studied the schematics and the descriptions of the system there isn't even a single extra wire used only by the Hill holder.

Click to expand...

I'm not on about physically deactivating it, I'm on about the options within the ECU. Have you tried playing with a copy of MultiECUscan.net software. This enables the ABS to be deactivated, maybe it'll allow the Hill holder also

i have already tried that.
it does not release; if anything it makes the brakes stick harder ( more pressure)