rear disc change

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stevee1953
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rear disc change

Post by stevee1953 »

Hi all,i am seeking some advice on deactivating the ebs on a picasso 2009 mk1,i am going to change rear discs and pads hopefully this week
I have got diagbox,my question is,in diagbox i see two options to put brake into release mode either removal of cables,or removal of the
actual ebs motor,I have a workshop manual,but it just tells me to use diagnostics to do this,so does it matter which one i use to release
the brake.I did hear of a pic owner using the wind handle to release the brake,is this also possible??I dont want to get into trouble by
doing something i am not sure of,,any advice will be appreciated..thanks steve

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GiveMeABreak
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Re: rear disc change

Post by GiveMeABreak »

If replacing the rear pads only, then you don't need to use the diagnostic tool. Just ensure that the car is immobilised, the handbrake is fully released and the battery is disconnected, to prevent the vehicle from accidental or otherwise re-application of the handbrake during fitting of the pads.

If replacing the disc hubs, then you need to place the electric parking brake in the removal position using the diagnostic tool which provides the clearance necessary to unclip the cables. Following replacement, you then have to run 2 procedures:
  • Carry out the handbrake cables packing procedure.
  • Carry out the electric parking brake calibration procedure (this re-defines the handbrake application starting point).
After the above check the application of the parking brake.

The procedures should be guided.

stevee1953
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Re: rear disc change

Post by stevee1953 »

Thanks marc,,for your help..so i will go into cable replacement,as i will be disconnecting them with diagbox,i was just unsure which one..i suppose as long
as i can release them all should be well..steve

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GiveMeABreak
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Re: rear disc change

Post by GiveMeABreak »

Although I have an electronic parking brake on my X7 it is a different system to yours, so I can't verify the Diagbox operation part of this, but my last post is specific to your MK I C4 Picasso operation for Pads / Discs.

stevee1953
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Re: rear disc change

Post by stevee1953 »

Again thanks marc,i have seen a few vids and info about this procedure but most have been for mk2 where the motors for ebs are on the calipers.
but mine is under the passenger seat...but i understand now,about the recalibration with diagbox..thanks for your help..steve

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GiveMeABreak
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Re: rear disc change

Post by GiveMeABreak »

Yes they changed the system on the later Picasso, but yours still has the motor unit under the passenger seat as you've said. Hope all goes well, but follow the battery disconnect and reconnect procedure when disconnecting the battery:

BSI Reset / Battery Disconnect / Reconnect Procedure

stevee1953
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Re: rear disc change

Post by stevee1953 »

Just a fast one marc if your still there,on the disconnecting battery procedure,you state disconnect the earth terminal,,will disconnecting the positive terminal be ok???
I ask because i would have to take out the battery box to get to the terminal,bit of pain,,but if thats the way it is i will do it the recommended way...thanks..steve

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Re: rear disc change

Post by GiveMeABreak »

Hi Steve

The reason is to prevent short circuits. As the negative is grounded through the vehicle chassis, if you are in the process of removing the positive and a wrench or other metal object comes into contact with this terminal and part of the body, it can cause short circuits / worst case cause a fire if flammable materials are about.

stevee1953
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Re: rear disc change

Post by stevee1953 »

ahh yes makes sense,better safe than sorry as they say.ok thanks marc, will try and modify the box when its off so i dont have to keep removing to disconnect..
thanks again,,I am feeling more confidant now..steve

stevee1953
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Re: rear disc change

Post by stevee1953 »

Hi marc if your about,just an update on disc change,they came on thursday,and put them on friday,no problems until the end when after waking the car and connecting to diagbox.
it threw up a few faults abs handbrake fault,,so recalibrated ebs again and moved car off the chocs,and hey presto,it all came back to life,scary moment for few minutes,but every thing is working as it should.So a big thanks for your advice,cheers steve

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GiveMeABreak
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Re: rear disc change

Post by GiveMeABreak »

No worries, Steve. That routine just re-tensions the brake cables back to normal after you had them in the removal mode.

Glad it's all perfick. :-D