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Brake Pressure Sensors

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Old Oct 5th, 2015, 09:41   #11
swedishandgerman
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Originally Posted by Chrisw4266 View Post
Just had the same fault on my V70. I spent £80 on the icarsoft scanner to read the codes.
After clearing them I swapped the sensor wiring plugs from one to the other, if the code changes from sensor 1 to sensor 2 you'll know the sensors is the fault. If not then its possibly a abs ecu fault. I got my sensor from
http://www.volvobreakers.co.uk/volvo...vo-abs-sensor/
You'll need a deep 27 mm deep socket to remove the sensor. Its a bit awkward to get at but straight forward enough to do.
So far so good no warning message.
Thank you! Mine says BCM-0130 Brake pressure sensor 1 - signal too low. Right now I have no idea which is 1 and which is 2, so your method tells me which is which.

As above, mine is temperamental too. The message has appeared randomly in the last 6 months, but within the last couple of weeks it's on more than it's off. It's typical of those types of switches; similar to an Amazon brake light switch which works sometimes when the switch is old!!
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Old Oct 8th, 2015, 23:06   #12
Chrisw4266
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The sensors are located on the brake lines behind the fuse box, the sensors are different to the pedal sensors, these are fluid pressure sensors.
They're mega bucks from Volvo so that's why I went for a used one. You can buy a lot of used sensors for the price of a new one
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Old Oct 8th, 2015, 23:40   #13
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I so agree with Chris above .I nearly always use second hand parts .You can if you wish specify that the parts supplied should be Volvo original where it counts ,that way you get the reliability without the out of this world prices .The other week I had to get two of the big bearing carriers that carry the front wheels ,mine were wasted with alu .corrosion and the tester did not like them .Got them from specialist breakers via Parts Gateway and they arrived here in the Highlands ,48 hours later ,good as new and £30 each !I think I would have a coronary if I knew how much they were new !
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Old Oct 8th, 2015, 23:49   #14
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I so agree with Chris above .I nearly always use second hand parts .You can if you wish specify that the parts supplied should be Volvo original where it counts ,that way you get the reliability without the out of this world prices .The other week I had to get two of the big bearing carriers that carry the front wheels ,mine were wasted with alu .corrosion and the tester did not like them .Got them from specialist breakers via Parts Gateway and they arrived here in the Highlands ,48 hours later ,good as new and £30 each !I think i would have a coronary if i knew how much they were new!
I think they are £30 new..oops soreee!
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Old Jan 20th, 2016, 14:38   #15
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Default Brake Pressure Sensor DIY

Hi all Im new to the forum. Owned my 2010 XC90 D5 for nearly two years - superb car...until it goes wrong!

Just had a message on the dash telling me "anti skid service required". Got an Indi to plug into diagnostics and they said that there is internal faults in both 1&2 brake pressure sensors.

A bit of browsing on the internet tells me the parts new are seriously expensive but second hand parts from a breaker are about £15ea!

So question is how easy is it to replace? Looks like a screw off, screw back on job but will I have to bleed the system as well? When I take the current sensors off will that expose the brake lines to air?

On the face of it looks like a simple job but am I underestimating the size of the task here?

Thanks.
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Old Jan 20th, 2016, 16:45   #16
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Simple! Seriously: dead easy.

Seems a bit odd that both pressure sensors are faulty, but so be it. You're correct; they are about £250 each new. I've not seen them for £15, but I paid £58 for 2 second hand ones incl postage.

They seem to send out second hand parts together with the junctions. In fact, they cut the brake lines to save time. The simplest way is to unscrew the sensors using a deep 27mm socket. A tiniest amount of air could get into the system, so a full bleed afterwards is good advice.

In a seperate thread on the same topic, I incuded a couple photos that might be useful to you:

http://www.volvoforums.org.uk/showth...t=brake+sensor
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Last edited by swedishandgerman; Jan 20th, 2016 at 16:50.
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Old Jan 21st, 2016, 13:15   #17
Thassos
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Smile pressure sensors

I did some checking into those pressure sensors, they put out a dc voltage relating to fluid pressure, and the bcm seems to compare the difference, so if your seeing the fault code it might not be complete failure of the sensor needing replacement. You can run a calibrate routine in vida that takes out small differences in the signal level that may fix things for some ppl. I did some long term logging of the outputs from them to get an idea how much they differed during use over time if anyone is interested !
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Old Jan 21st, 2016, 14:57   #18
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For your parts you should go to Parts Gateway online and get used parts ,which are guaranteed .I got a brake position sensor from a breaker on there ,and, as a surprise to us both there proved to be two posibilities and i got the wrong one .Send it back ?Naw ,I,ll just send you another one foc .Total with postage ,a tenner i think .
Just don;t go down the new parts route .With Gateway ,parts are very cheap and guaranteed .You can't go wrong .
On the codes ,you have to clear them and try again,to see if the fault is fixed .Any goodish generic reader will get you into abs (see diagnstics world )or get set up with Vida ,Volvo specific ,but tells you more than need to know probably .Order some pressure sensors from Gateway and save yourself a bomb .
BUT, you must have a reasonable code reader of some sort for these cars .It is absolutely impossible to run them without and you will soon become an expert ,as ,believe me the will give you lots and lots........and lots of codes to read .I have just sold a phase 2 v70 ,because I just could not be a.......ed with these endless faults .
Now as you see have got a 940 ,which is electronic, but not over the top like the phase 2.
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Old Jan 21st, 2016, 14:59   #19
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Default pressure logging

Wow Thassos .Not many people will know that!!
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Old Jan 21st, 2016, 16:17   #20
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Quote:
Originally Posted by Thassos View Post
I did some checking into those pressure sensors, they put out a dc voltage relating to fluid pressure, and the bcm seems to compare the difference, so if your seeing the fault code it might not be complete failure of the sensor needing replacement. You can run a calibrate routine in vida that takes out small differences in the signal level that may fix things for some ppl. I did some long term logging of the outputs from them to get an idea how much they differed during use over time if anyone is interested !
Oh that's interesting - I noticed the readouts differed somewhat between the 2 sensors after I replaced the faulty one. My faulty one gave no read out when the brake pedal was depressed.
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