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Grinding noise after change shock absorbers


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brujo311
New User

Nov 20, 2016, 7:45 PM

Post #1 of 8 (351 views)
Grinding noise after change shock absorbers Sign In

Hi, ive got a problem with a Land Rover Freelander (2000 version), after i changed the front shock absorbers i get a loud grinding noise.
The noise appears after 20~30 minutes of driving, between 30 and 90 km/h.
If i rise the speed above 100 km/h it progressively disappears. Also absolutely disappears if you press the brake and changes or disappears if you turn the wheel.
I thought could be the transmission but if you put the gear box in N or just press the clutch the sound does not stop.
I changed bearings thinking could be some runout on the brake disks but nothing changed.
Im desperate, dont know what else to change lol. Looks like something is haunted over there.
Thanks for your help.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 20, 2016, 10:42 PM

Post #2 of 8 (344 views)
Re: Grinding noise after change shock absorbers Sign In

First off this is a US based site with limited specific info. I don't think you need that as this seems since it happened right away with a shock absorber change it may have been hoisted or jack stands placed incorrectly such that it bent probably the backing plate to the front brakes - a dust shield, water shield that is touching the rotor.


"Changes or disappears" with applying the brakes says a lot. This is almost certainly brake involved. Do look right at pads and caliper and check they are right as well,


T



brujo311
New User

Nov 20, 2016, 11:00 PM

Post #3 of 8 (336 views)
Re: Grinding noise after change shock absorbers Sign In

Hi, thank you very much for uour reply. Ive already checked the the brake system, disks and pads are new. The caliper doesnt seem to have any trouble. I changed also the guide pins, checked the dust shield and nothing. Is annoying lol. Thanks for your help.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 20, 2016, 11:35 PM

Post #4 of 8 (330 views)
Re: Grinding noise after change shock absorbers Sign In

Did you do the pads and "guide" pins at the same time? Looking for a common reason for this to happen all at once or seems like it.


You don't always see the faults or new pads or if "guide pin" are not the same or faults with new pads - some just stink and worse if you do just pads without servicing or replacing the rotors.


A ring of unworn or rusted metal on rotor where pads don't wear now new or newer ones do as you turn. Sensors used on some pads to make noise as a warning they are worn are possibly purposely making noise that may be wrong so have to really look for this stuff.


You need to take the calipers off and look right at the pad's friction surface for clues. Still smacks of a dust shield with braking or turning there is some motion/movement of parts that is normal the they are too close for having worked on it which you've said all happened at once,


T



brujo311
New User

Nov 21, 2016, 12:20 AM

Post #5 of 8 (320 views)
Re: Grinding noise after change shock absorbers Sign In

Got an idea, uploaded a video to youtube in which you can listen the sound. If you have some time watch it. Thanks very much for your help.
https://youtu.be/U2J19k33LxU


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 21, 2016, 1:16 AM

Post #6 of 8 (314 views)
Re: Grinding noise after change shock absorbers Sign In

That actually showed - funky at this site to get them to work.............
as a link = https://www.youtube.com/...amp;feature=youtu.be


I'll re describe that as a tone like a tuning fork would make NOT a "grind" as the thread suggests.


Still it's now highly likely a brake to rotor "tone" to me. Why remains unknown.


Best I can do is suggest tricks to isolate what the source is. Brake rotors when turning, especially if resurfacing if you've watched machine work you put a dampener on them so they don't do this while being machined.


That's why I'm leaning towards or about saying this is a brake problem. Calipers are NOT retracting properly or pads may have debris "impregnated" into the material causing this.


Just in taking calipers off with pads still intact and in place you probably picked up the debris in just that as the outermost part of a rotor usually isn't a friction area for a little bit. Any debris, rust, contamination of grease or something could be the root cause.


If this was in front of me and mostly nothing was obvious I think I'd take pads off and just rough them up a little bit AND use a product for cleaning brakes sold as such. Clean rotors while in place with a cloth or paper towel soaked in the cleaner and spray clean the pads as well.
Good bet noise will then be gone on next test drive but think it will return. If that just makes it go away for some time then you know the problem is the pads and or rotors need attention also knowing not guessing calipers are in fact good and properly lubed with any anti rattle clips and hardware in place properly as well.


In short blaming this on a brake material problem - any reason to get the rotor to make the tone.


FYI - Disc brakes are NOT spring loaded to retract when you release them. Rather the only thing the makes them just slightly back off is the sealing ring on the piston(s) inside the caliper bore. They stay VERY close but shouldn't drag at all if correct but might hear some sound with just turning by hand enough with wheel spun by hand should coast on it's own while hoisted and doubt both side do now.


Brake problem and annoying which is why you are here.


Side note: Have a vehicle if I don't use for a day or two and damp parked outdoors will do that just for a couple seconds with first braking then stop it till they are damp again with same conditions. Old - OE brakes and know exactly what it is and when it will or will NOT do that. My own vehicle now owned for about 14 years so expect it.


Lube and check brake parts on this thing. Clean as said and if that changes it as it really is annoying if nothing else would replace those pads and turn the rotors and wash them with water if turned so fine metal left behind doesn't get into pads. Brake cleaner sprayed while off and away from rubber anything would do.
I don't know why this happened for sure because of other work you did but really sounds like brake noise you can get rid of as said,


Tom



brujo311
New User

Nov 21, 2016, 1:52 AM

Post #7 of 8 (308 views)
Re: Grinding noise after change shock absorbers Sign In

Thank you very much. Ill try it this weekend and let you know what was wrong if can find something. I already bought the rubber seals for the calliper but i didnt install them since i think the old ones are vood enaugh. But have got the spare if needed. Thanks for your help.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 21, 2016, 3:21 AM

Post #8 of 8 (304 views)
Re: Grinding noise after change shock absorbers Sign In

OK - Remember and I'll try to make a generic picture show for you on a caliper. The rubber you may have may be just dust boot and I'm NOT talking about that but rather the sealing rubber ring and piston can fail - age, use and or got wet inside? Hard to know what you have or plan so far. Here you are much more likely to just exchange the entire thing for one totally redone both faster and cheaper than doing it yourself.


Picture and try to see how one works if this shows?
>>

^^ Was there, may disappear? 2nd try - they call what I'm talking about a ''seal'' in this diagram,


Good luck with what you can find.


Side note: This was all night and usual for me sometimes at GMT minus 5 hours and clock times you see are off an hour at this time now 5:20AM EST just FYI,


T







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