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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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S60 front end clunkViews : 2627 Replies : 25Users Viewing This Thread : |
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Jul 16th, 2018, 16:20 | #21 |
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Last Online: Feb 1st, 2022 11:11
Join Date: Mar 2015
Location: Hampshire
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Bumping this - I appreciate there's a similar thread ongoing for a V70.
Replaced both rear shock absorber top mounts (with FAI parts) and this has made no difference to the knocking noise. Previously I've replaced all droplinks, lower gearbox mount and the exhaust brackets. I got a friend to drive the car slowly at the weekend and I ran alongside. The rear offside (driver's side) wheel makes a brief rubbing noise once every revolution. I am assuming this is a binding brake caliper. (I am assuming it's not a knackered wheel bearing - the noise doesn't get louder at speed and it's an rubbing/grinding noise once per revolution - not a constant droning noise.) I won't be able to take the wheel off and inspect the braking system until the weekend. Could it make sense to suggest that the binding is down to a faulty caliper piston, which is causing the brake pads to knock around in the housing? Alternatively (and I worry here) could it be the parking brake shoes rattle around in their housing? I replaced the parking brake shoes with brand new genuine Volvo shoes with a genuine Volvo spring kit 2 years ago (fitted by a garage). It would seem strange for them to have delaminated over such a short period of time - broken springs perhaps? Just wondering whether to expect to need to purchase a brand new caliper when I take the brakes apart this weekend. Just for the record, I'm not losing brake fluid, braking efficiency (both footbrake and parking brake) seems fine, and the knocking doesn't just occur when I press the brake pedal. It is intermittent (worse over bumps/rough surfaces) and only audible at low speeds. I can't hear the knocking when I give the car a good shove from various angles and at various spots when stationary. Of course I'm just guessing at this point - it's just it's my only car and I want to plan ahead and not get stranded! |
Jul 16th, 2018, 19:22 | #22 |
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Last Online: Mar 21st, 2024 09:38
Join Date: Jul 2010
Location: Kent, UK
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rear brake noises
Hi Mc G,
Your rubbing noise might be something simple like a brake backplate being bent in toward the disc, maybe contacting with the outer lip of the disc where you can sometime have rust/crud buildup. If you have replaced the shoes, i doubt they would have delaminated in a few years it might also be some rust or debris inside the drum that could make a similar noise, have you tried pulling the handbrake up at slow speed ? A stuck caliper usually generates a lot of heat (you'll smell something like an overcooked clutch) after some miles due to the friction, and you probably wouldn't find the hub span too freely if you jacked up the offending wheel (assuming the handbrake was also off of course!) |
Jul 16th, 2018, 19:46 | #23 |
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Last Online: Today 14:30
Join Date: Feb 2009
Location: Hackensack
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As Thassos said, a slightly bent dust shield is common.
My favorite to check are the glide pins. Each caliper has two. You remove them with a 7mm hex. I recommend a 7mm hex bit on your common wrench set. The familiar key may work easily but there are many cheap, hollow hex keys which'll bend. The pins are easily accessed behind the rubber caps. You'll see their black, cylindrical boots sticking out of the rear of the bracket. You can easily remove them one at a time without disturbing anything. Make sure all 8 are intact. I've found the caps missing, boots nibbled away etc. See if the pins are clean and lubed. Every one I remove is bone dry and/or has stickiness and rust. Clean 'em and relube them with real brake grease NOT copper slip (anti-seize). This'll have nothing to do with your clunking. |
Jul 17th, 2018, 07:55 | #24 |
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Last Online: Feb 1st, 2022 11:11
Join Date: Mar 2015
Location: Hampshire
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Thanks for. Oteh answers above. Will look at the dust shield and glide pins.
Can worn/broken rear shock absorbers cause a 'clunk' (the shocks themselves, not the top mounts)? They seem to be doing their job, but they are old and I was wondering if they were the culprit. |
Jul 17th, 2018, 13:04 | #25 |
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Last Online: Today 14:30
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Location: Hackensack
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I had worn shocks which grunted and moaned roughly. It was much louder than I ever could have imagined.....but not what I'd call a 'clunk'?
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Sep 13th, 2019, 14:22 | #26 |
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Last Online: Mar 2nd, 2024 18:51
Join Date: Nov 2001
Location: Evesham
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I've had an intermittent loud clunk that usually appeared after having the car jacked up. Normally it faded away but of late has persisted. It seemed to occur at odd times, ie not necessarily when going over bumps. Anyway, I've replaced the lower gearbox torque mount (genuine Volvo) and thankfully it seems to have solved it. The old one had the rubber torn on one side (the smaller of the two rubber components), so was loose but not completely separated.
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