1995 850 T5 - What's causing this?

procee · Mar 27th, 2012, 15:38

Hi All,

I have wound up being given a 1995 Volvo 850 T5 SE Estate. apart from the usual minor niggles (leaky heater matrix, needing a really good clean and a service, explansion tank and PCV job) there is another very annoying issue which I was hoping someone on here could help with.

At low speeds, for example creeping along in traffic with the car in 1st gear, engine just idling (no throttle or breaks applied) I often get a noise which sounds like a valve operating very quickly. If this is happening and I press the brakes (even with the most gentle touch), the car stops very suddenly with a strange grauncing kind of noise. Not quite a grinding, but it's more towards a grind than a squeak. The brake pads and calipers are all fine, so it does not seem to be worn pads grinding on disc.

The ABS light doesn't come on (although the bulb does function when you first turn the car on) and there is no TRACS system fitted.

As a bit of background, I helped source this car for the previous owner about ten years ago and as he was away to sell it, he offered it to me. My intention is do a 'working restoration' so not concours, but mechanically very good and usable for holidays etc, maybe even commuting, it can't drink anymore fuel than my Landrover.

I would be very greatful to anyone who has experienced a similar issue with these cars before, if they could point me in the right direction.

Thanks

Jon

jayeastanglia · Mar 27th, 2012, 17:41

asb can do a self test at about 12mph could be that noise u hear

procee · Mar 28th, 2012, 13:45

Hi,

Don't think it's the self test - feels more like something is on the verge of being broken.

What are the symptoms of a failing driveshaft? I ask as apparently this noise only used to happen when you had the wheel turned but has since started doing it a lot more often.

Cheers

Jon

ShadeTek · Mar 28th, 2012, 14:56

You need to check all your pads by taking them out and seeing if they have delaminated. Don't just look at them , take them out and try to detatch them and see if they are separating. They can chop about in the calipers giving pretty bad noises and jam causing damage to the disc as I found out.

procee · Mar 29th, 2012, 13:41

Hi,

Had a good check of the pads, they seem fine. Speaking to the P.O he was saying the pads were changed about a month ago but it was doing the same thing with the old pads as well.

Cheers

Jon

jayeastanglia · Mar 29th, 2012, 17:26

can u video the fault noise post it on u tube and send the link up here....could be anything really but possible fuel pump relay if its thats sort of buzing or ignition relay ..noise by your right foot sort of area could be any of them realys..

ewanc0 · Mar 29th, 2012, 23:48

What about the brake shoes as opposed to the pads

Paffel · Mar 30th, 2012, 22:49

Quote:

Originally Posted by ewanc0

What about the brake shoes as opposed to the pads

Indeed, these are located under the rear brake disks - remove the rear wheels (jacking up/securing the car first of course), remove the rear pads and calliper from the rear disc.
Move the disc so that the inspection hole is roughly at the 11o'clock position (for offside) or 1 o'clock (for nearside) - you should see the handbrake adjuster (a toothed cylindrical object) - pop a screwdriver in and turn these teeth round to loosen off the handbrake. Once done enough, remove teh small torx guiding screw (if you have any!) and the rear disk can be removed.
You can then look at your handbrake shoes and check them as above.

procee · Apr 19th, 2012, 17:39

Wow, I hadn't realised it was sos long ago since I posted this...

Having spent a bit more time on Google (and done a lot of other work to the car) I am thinking that the problem seems similar to the one very briefly described at http://www.volvoclub.org.uk/850_brakes.shtml . Has anyone carried out this modification and is there a 'how to' anywhere? The car is OBD1 with the (frankly huge) silver ABS control unit in a vertical position on the left hand inner wing.

I know the car had been doing this for a good while before I came to own it.

Cheers

Jon

Samuel · Apr 19th, 2012, 18:00

Hi Jon, I have a 93 8504 se. It did exactly the same but also gave me full on brake pedal pulse. The ABS ECU (big shiny thing) rarely goes wrong but the ABS pump below this does and makes that rapid tapping sound. all this happened on mine with no ABS light or fault codes. Repaced pump and checked and replaced sensors back and front to be safe.
Hopefully yours is not this but its a possible if you dont get any joy with the hand brake pads.

Sam

Mar 27th, 2012, 15:38	#1
procee New Member Last Online: Jan 31st, 2013 17:26 Join Date: Oct 2009 Location: Aberdeen	1995 850 T5 - What's causing this? Hi All, I have wound up being given a 1995 Volvo 850 T5 SE Estate. apart from the usual minor niggles (leaky heater matrix, needing a really good clean and a service, explansion tank and PCV job) there is another very annoying issue which I was hoping someone on here could help with. At low speeds, for example creeping along in traffic with the car in 1st gear, engine just idling (no throttle or breaks applied) I often get a noise which sounds like a valve operating very quickly. If this is happening and I press the brakes (even with the most gentle touch), the car stops very suddenly with a strange grauncing kind of noise. Not quite a grinding, but it's more towards a grind than a squeak. The brake pads and calipers are all fine, so it does not seem to be worn pads grinding on disc. The ABS light doesn't come on (although the bulb does function when you first turn the car on) and there is no TRACS system fitted. As a bit of background, I helped source this car for the previous owner about ten years ago and as he was away to sell it, he offered it to me. My intention is do a 'working restoration' so not concours, but mechanically very good and usable for holidays etc, maybe even commuting, it can't drink anymore fuel than my Landrover. I would be very greatful to anyone who has experienced a similar issue with these cars before, if they could point me in the right direction. Thanks Jon

Mar 28th, 2012, 14:56	#4
ShadeTek Premier Member Last Online: Jun 5th, 2024 17:42 Join Date: Dec 2002 Location: Renfrewshire View Photos By: ShadeTek	You need to check all your pads by taking them out and seeing if they have delaminated. Don't just look at them , take them out and try to detatch them and see if they are separating. They can chop about in the calipers giving pretty bad noises and jam causing damage to the disc as I found out. __________________ Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 93000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301/Topdon Top Scan

Mar 29th, 2012, 23:48	#7
ewanc0 VOC Member Last Online: Jan 14th, 2024 17:59 Join Date: Dec 2008 Location: argyll	What about the brake shoes as opposed to the pads __________________ Previous 97 S70 2.5 Auto, 97 940 Torslanda, 99 S80 2.5D auto, 99 S70 2.5D auto and 94 855 Turbo, 05 S60 D5, 08 C30 2.0D, 98 V70R Saffy Current 04 XC70

Apr 19th, 2012, 18:00	#10
Samuel Divingdad Last Online: Aug 14th, 2013 11:22 Join Date: Nov 2007 Location: Northampton	Odd noise from brakes and engine compartment Hi Jon, I have a 93 8504 se. It did exactly the same but also gave me full on brake pedal pulse. The ABS ECU (big shiny thing) rarely goes wrong but the ABS pump below this does and makes that rapid tapping sound. all this happened on mine with no ABS light or fault codes. Repaced pump and checked and replaced sensors back and front to be safe. Hopefully yours is not this but its a possible if you dont get any joy with the hand brake pads. Sam

Mar 27th, 2012, 17:41	#2
jayeastanglia Junior Member Last Online: Nov 17th, 2014 20:09 Join Date: Mar 2008 Location: redditch	asb can do a self test at about 12mph could be that noise u hear

Mar 28th, 2012, 13:45	#3
procee New Member Last Online: Jan 31st, 2013 17:26 Join Date: Oct 2009 Location: Aberdeen	Hi, Don't think it's the self test - feels more like something is on the verge of being broken. What are the symptoms of a failing driveshaft? I ask as apparently this noise only used to happen when you had the wheel turned but has since started doing it a lot more often. Cheers Jon

Mar 29th, 2012, 13:41	#5
procee New Member Last Online: Jan 31st, 2013 17:26 Join Date: Oct 2009 Location: Aberdeen	Hi, Had a good check of the pads, they seem fine. Speaking to the P.O he was saying the pads were changed about a month ago but it was doing the same thing with the old pads as well. Cheers Jon

Mar 29th, 2012, 17:26	#6
jayeastanglia Junior Member Last Online: Nov 17th, 2014 20:09 Join Date: Mar 2008 Location: redditch	can u video the fault noise post it on u tube and send the link up here....could be anything really but possible fuel pump relay if its thats sort of buzing or ignition relay ..noise by your right foot sort of area could be any of them realys..

Apr 19th, 2012, 17:39	#9
procee New Member Last Online: Jan 31st, 2013 17:26 Join Date: Oct 2009 Location: Aberdeen	Wow, I hadn't realised it was sos long ago since I posted this... Having spent a bit more time on Google (and done a lot of other work to the car) I am thinking that the problem seems similar to the one very briefly described at http://www.volvoclub.org.uk/850_brakes.shtml . Has anyone carried out this modification and is there a 'how to' anywhere? The car is OBD1 with the (frankly huge) silver ABS control unit in a vertical position on the left hand inner wing. I know the car had been doing this for a good while before I came to own it. Cheers Jon

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