Clunking NS400 pads part II - video inside, appreciate input
#1
Clunking NS400 pads part II - video inside, appreciate input
As a follow up to my previous post on this topic, take a look at the video and let me know your thoughts.
I can easily move the pads from left to right, however, this is not too dissimilar to what I can do with the pads on my G Coupe with Brembos, just takes less force to move them on the F.
My guess is that the problem lies more so with my ability to move them up and down as well. Indeed, at times after a road imperfection, it sounds like a second later the pads "drop" and you hear the clunk not only going over the imperfection, but after recovery as well. So, seems as though they are moving in both the x and y directions, and this is leading to a lot of noise.
If these pads really fit this loosely, others should without a doubt be hearing what I am; it is easily discernible with the windows open. If I apply brake pressure when going over he same imperfections to grip the pads tight against the rotors, no noise!
Final thoughts? Can someone else check their NS400s for movement?
I can easily move the pads from left to right, however, this is not too dissimilar to what I can do with the pads on my G Coupe with Brembos, just takes less force to move them on the F.
My guess is that the problem lies more so with my ability to move them up and down as well. Indeed, at times after a road imperfection, it sounds like a second later the pads "drop" and you hear the clunk not only going over the imperfection, but after recovery as well. So, seems as though they are moving in both the x and y directions, and this is leading to a lot of noise.
If these pads really fit this loosely, others should without a doubt be hearing what I am; it is easily discernible with the windows open. If I apply brake pressure when going over he same imperfections to grip the pads tight against the rotors, no noise!
Final thoughts? Can someone else check their NS400s for movement?
#2
Yep, when I had mine in it did the EXACT same thing like in your video. Mine were probably worse as 90% of the time when I stepped on the brakes it would clunk. I did notice that the clips were loose as well so I wonder if bending them so they clamp on the pads more will help?
Either way I am back to the dusty as hell stock pads but they do not clunk at all.
Either way I am back to the dusty as hell stock pads but they do not clunk at all.
#3
Former Sponsor
iTrader: (1)
The spring on top was my first concern- if that is a little bent and making little to no contact with the top of the pads then it can't do it's job. I'm not 100% convinced that's what is going on here but it wouldn't hurt to double check.
I belive we are going to see if we can get the OP another set of either Type NS or NS400 to see if it's a problem with this specific set of pads. Either way I'm pretty stumped because we have other pads from this batch out and on cars without issue. One way or another we'll try and get to the bottom of what's happening with the OP's brakes.
-Matt M.
I belive we are going to see if we can get the OP another set of either Type NS or NS400 to see if it's a problem with this specific set of pads. Either way I'm pretty stumped because we have other pads from this batch out and on cars without issue. One way or another we'll try and get to the bottom of what's happening with the OP's brakes.
-Matt M.
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supersonic (05-11-17)
#4
Yep, when I had mine in it did the EXACT same thing like in your video. Mine were probably worse as 90% of the time when I stepped on the brakes it would clunk. I did notice that the clips were loose as well so I wonder if bending them so they clamp on the pads more will help?
Either way I am back to the dusty as hell stock pads but they do not clunk at all.
Either way I am back to the dusty as hell stock pads but they do not clunk at all.
Speedfreaks has been great and we've patiently collected more and more data on the issue. Perhaps it's as simple as the pads being on the edge of tolerance and perhaps some calipers are just slightly on the opposite side of tolerance and together they are loose.
#5
What process did you use to replace the pads? Theres an instructional video of a ISF brake pad change on youtube that I know people on here are using. The person on the video giving details actually pried the retainer "cross spring" out of the two pins, rather than removing a pin first and taking the cross spring out. IMO removing the spring first before the pins is incorrect, since it will put a lot of stress on the spring and can deform it while bending it to come out. The purpose of that retainer spring is to keep tension on the pads and keep them in place. If yours is deformed, than you will likely have loose pads. I would check those cross springs first, and probably replace them, since they are cheap.
#7
And, just to be sure, these pads were installed by the lead GTR technician at my local Nissan dealer and a good friend, so, the installer is someone skilled in the art who tells me things straight. Additionally, two Lexus mechanics did the initial diagnosis, so, three sets of trained eyes all saying the same thing that there is too much play in the pads. None of them seemed to think that springs needed to be bent to hold them in better. I don't think those springs bend that easily--they are pretty resilient metal, not deforming easily.
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#8
If all 4 brakes are acting up, your installer could of easily overlooked that step of bending those clips back to apply tension. The sole purpose of that spring is to keep the pads from moving around...and obviously they are not doing the job on your car. And just looking at it isn't going to diagnose your problem, you have to take the parts out. Swapping pads is actually an easy process and can be done in about 45mins(less if your good at it). I would actually swap back to the stock pads just to see what happens.
Last edited by Fsport2UR; 05-12-17 at 09:04 AM.
#9
Racer
HEY I just check my half worn NS 400,s and no movement I check the spring pressure and there it a lot, NO MOVMENT and yes a am a mechanic 45year of experience and why would it take 2 lexus techs to figure this out ..................I know they were Irish to be sure to be sure...... sorry..... I hope you sort it, let us know cheers Neill
#10
^^^Thanks for checking! Funny enough, when I was at lunch yesterday I looked out the window and saw a blue ISF on the used car lot next door and I took a quick look at it and checked the brakes--funny at it had green project mu pads on it. I checked both front sides and no significant movement of the pads that I could feel....but, that being said, the car was in pretty lousy shape and it could have been that they were rusted onto the rotor from sitting on the lot.
#12
Pole Position
iTrader: (2)
Project Mu's don't come with new anti rattle clips/hardware for the pads? I know most here aren't fans of the StopTechs but it was included for the fronts with mine.
http://www.ebay.com/itm/LEXUS-OEM-FA...hXWEf1&vxp=mtr
http://www.ebay.com/itm/LEXUS-OEM-FA...hXWEf1&vxp=mtr
Last edited by msgs350; 06-08-17 at 05:35 PM.
#15
Nice! Thank you! Just ordered the front and rear sets.
isfvss--I'm going to try these before I swap in new pads to make sure that one way or the other this issue is resolved the next time I have my mechanic work on it. Hopefully it will turn out to just be the clips. ! I'll report back as to the final resolution once it's complete.
isfvss--I'm going to try these before I swap in new pads to make sure that one way or the other this issue is resolved the next time I have my mechanic work on it. Hopefully it will turn out to just be the clips. ! I'll report back as to the final resolution once it's complete.
Last edited by Jz39; 06-08-17 at 07:26 PM.