Other 70 Problem: - Adjusting the brake position sensor

SKEXIS · Jun 2nd, 2007, 21:52

Hello,

Like many other V70 owners I've suffered from the cruise control deciding not to co-operate, tempting me with the "cruise" indicator on the dash, but then refusing to actually hold the speed

From reading other posts on the forums, the brake position sensor does seem to be the likely culprit, though at a cost of approx £95 from the main dealer they do not seem a particularly cheap option......

What I'm wondering is whether there is any degree of adjustment possible in the sensor itself. I've not located it yet and have not tried to take it apart. Nor have I ever seen the unit by itself.

If anyone has already adjusted one, please let me know how you got on!

Cheers

Paul Clifton · Jun 3rd, 2007, 21:38

This sensor is not adjustable and can be found on the brake servo unit. Cylindrical affair with connector. This is a common problem and the only cure is a new sensor. If left will eventually flag up ABS fault s this sensor is used by the ABS system as well.

Paul.

Talon · Jun 4th, 2007, 18:19

Quote:

Originally Posted by SKEXIS

I've not located it yet and have not tried to take it apart. Nor have I ever seen the unit by itself.
Cheers

I would like to find out where it is located as well, just to make sure everyhting is ok, Let me know if you find the location

SKEXIS · Jun 21st, 2007, 21:55

Talon - to answer your question the brake position sensor fits directly into the servo (it's on the left hand side as you're looking at the servo unit).

It's secured in place with a think metal ring that clamps around the unit - to remove it, you simply unclip the electrical connector, get a thin blade screwdriver and prise the ring away. Then pull gently (you'll hear the vacuum collapse in the servo unit as you pull it out).

As pc654 says, there is no degree of adjustment in this sensor, in that it's a sealed plastic cylinder with a single metal rod sticking out the end. It's little more than a variable resistor; when you put a meter across two of the three pins (some of the sensors are three pins, some two) you can see the resistance increase / decrease as you push the rod in and out.

Thinking this was the problem with my car, I bought one for £15 from a breaker, put it in, but it made no difference at all. Back to the drawing board I guess

At least I didn't go and buy a new unit from the dealer for £95!

The car is going into the dealer tomorrow for an aircon re-gas, might ask them to diagnose the problem there and see what they can come up with as an answer!

piggy · Jun 22nd, 2007, 19:32

New sensor from main dealer £30+vat.Surely the £95 was for part and fitting? Just had mine done last week.Cruise control had gone bad, due to faulty sensor.All fixed now and am really pleased ,as i did'nt realise how much i missed it!

piggy

Jun 2nd, 2007, 21:52	#1
SKEXIS New Member Last Online: Oct 25th, 2007 21:58 Join Date: May 2007 Location: Redditch	Adjusting the brake position sensor Hello, Like many other V70 owners I've suffered from the cruise control deciding not to co-operate, tempting me with the "cruise" indicator on the dash, but then refusing to actually hold the speed From reading other posts on the forums, the brake position sensor does seem to be the likely culprit, though at a cost of approx £95 from the main dealer they do not seem a particularly cheap option...... What I'm wondering is whether there is any degree of adjustment possible in the sensor itself. I've not located it yet and have not tried to take it apart. Nor have I ever seen the unit by itself. If anyone has already adjusted one, please let me know how you got on! Cheers

Jun 3rd, 2007, 21:38	#2
Paul Clifton Paul Clifton Last Online: Jul 18th, 2023 15:50 Join Date: Dec 2001 Location: Wisbech View Photos By: Paul Clifton	Bps This sensor is not adjustable and can be found on the brake servo unit. Cylindrical affair with connector. This is a common problem and the only cure is a new sensor. If left will eventually flag up ABS fault s this sensor is used by the ABS system as well. Paul. __________________ Paul Clifton. A man's knowledge can never outweigh his experience.

Jun 21st, 2007, 21:55	#4
SKEXIS New Member Last Online: Oct 25th, 2007 21:58 Join Date: May 2007 Location: Redditch	Talon - to answer your question the brake position sensor fits directly into the servo (it's on the left hand side as you're looking at the servo unit). It's secured in place with a think metal ring that clamps around the unit - to remove it, you simply unclip the electrical connector, get a thin blade screwdriver and prise the ring away. Then pull gently (you'll hear the vacuum collapse in the servo unit as you pull it out). As pc654 says, there is no degree of adjustment in this sensor, in that it's a sealed plastic cylinder with a single metal rod sticking out the end. It's little more than a variable resistor; when you put a meter across two of the three pins (some of the sensors are three pins, some two) you can see the resistance increase / decrease as you push the rod in and out. Thinking this was the problem with my car, I bought one for £15 from a breaker, put it in, but it made no difference at all. Back to the drawing board I guess At least I didn't go and buy a new unit from the dealer for £95! The car is going into the dealer tomorrow for an aircon re-gas, might ask them to diagnose the problem there and see what they can come up with as an answer!

Jun 22nd, 2007, 19:32	#5
piggy Member Last Online: Jul 16th, 2012 18:17 Join Date: Feb 2007 Location: cambridge2	New sensor from main dealer £30+vat.Surely the £95 was for part and fitting? Just had mine done last week.Cruise control had gone bad, due to faulty sensor.All fixed now and am really pleased ,as i did'nt realise how much i missed it! piggy

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