1998 s70 Abs/tracs - Strange noise

JRev · Post by **JRev** » 07 Apr 2015, 16:46

This is a very intermittent issue. When driving at slow speeds, usually when approaching a car park and turning in, sometimes there is a loud sound I hear through the cabin which is difficult to describe, but its a vibrating sound, like something metal has jammed but as soon as I touch the brakes, the noise goes and the abs/tracs lights come on.

Then when the car is stopped, and started, the abs/tracs lights goes off after 10 seconds.

In general the brakes work fine, no general noises or squeaks or shudders or pulsating through the pedal.

Any ideas of what the issue could be?

Post by **Ozark Lee** » 07 Apr 2015, 18:34

It could be a dirty wheel sensor. The fronts are easy enough to clean but for the rears you need to remove the brake drums to get to them which is a bit of a pain.

At the end of the day, unless it has been rebuilt already, the most likely problem is the ABS module itself. They have a 100% failure rate but they are easily rebuilt for a reasonable price. I'm not sure what the UK price is (+VAT and so on) but in the US the service is typically under $100.00.

...Lee

Post by **scot850** » 07 Apr 2015, 19:28

Another place to look at is the parking brake cables and the shoes. The cables bind and the shoes can de-laminate with age. So while you are looking at the abs sensors, check the parking brake assembly.

Also check the condition of your drive axles that nothing is wrong like the cv boots are split or the shafts are seizing when turning.

Here are a couple of places claiming to repair the ABS modules in the UK

http://www.clusterrepairsuk.co.uk/repair/make/volvo

http://www.ecusolutionswales.com/volvo- ... ir-5-p.asp

This as Lee says is often one of the top contenders for ABS/TRACS issues.

Neil.

sacricide · Post by **sacricide** » 08 Apr 2015, 00:21

I just rebuilt mine and it worked perfect. Took a bit of time, and I'm not really experienced soldering either.

JRev · Post by **JRev** » 08 Apr 2015, 04:34

Cheers for the info (and links), will get the car jacked up and have a look as was aware the ABS module fails but it was more the noise that was a slight concern but can now investigate further! cheers

JRev · Post by **JRev** » 26 Apr 2015, 15:24

Just an update as I finally got round to having an inspection and couldn't find any broken parts or damage to brakes/cv boots/sensors etc so am going to inspect the module from the bonnet and likely I will just get the module sent off for repair.

Post by **misha** » 26 Apr 2015, 16:50

If you have soldering skills,you can re-solder it yourself.

JRev · Post by **JRev** » 26 Apr 2015, 16:55

misha wrote:If you have soldering skills,you can re-solder it yourself.

I may well attempt as book marked this video for when I inspect the connections from the bonnet