gs450h clunking from front brakes

Recommended Posts


My 2007 gs450h makes a metallic knocking sound from the front brakes. It is more prominent when I move forward slowly,  then brake, then reverse slowly,  then brake,  etc, as opposed to during general driving at speed.

It doesn't sound like worn bushes.  It has a higher metallic pitch.

Front pads and discs are new. But the sound was there before I changed them anyway. 

Please see attached video and have a listen. It's driving me nuts. 



Share this post

Link to post
Share on other sites

I cannot get that to play, but the usual cause of a slight knock from the brakes is missing anti rattle shims. If the brake pads have any free movement in the direction of travel of the disks when the brakes are applied the pad rotates with the disk until it hits the caliper body.

Jack the front of the car up, and get someone to hold there foot lightly on the brake. Try turning a front wheel backwards and forwards if you hear a slight knock that is the problem.


  • Like 1

Share this post

Link to post
Share on other sites

Cheers.  I'll try and see what the issue is with the vid playing. 

I have had cars with missing anti rattle shims,  they made tinny noises when driving along,  particularly over speed bumps. 

I have to say this doesn't sound like that.

But I will jack the car up and have a look round 

Share this post

Link to post
Share on other sites

Just to say that I managed to view the video without any problems.

John, in case you weren't aware, you can use a program called VLC media player to view mp4 videos.  It is very good and I have rarely come across a video it couldn't play.  You can get it here:

As for noise, I agree it is a strange one.  I currently have a clicky noise from my front brakes which sounds like shims, and it sounds nothing like what you are experiencing Jeremy.  I am not sure what to suggest other than I am very curious to know what is causing it.

  • Like 1

Share this post

Link to post
Share on other sites

Cheers shahpor, i will take the front wheels off in a couple of weeks when i am off work, and try johns method, though i very much doubt it has anything to do with anti rattle shims

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Matt96
      I have owned my is250 2011 for 1 year now. Full main dealer history. 58000 miles. Main service has been done. Over the last few months when braking and steering at a low speed there are a couple of clunks that sound like they are coming from the front drivers side wheel. I look it to lexus Hatfield and under warranty they replaced the shock absorber and top mount. The car seemed to be ok for a while but not long ago the clunk noise has appeared again. It also only happens when the engine has warmed up. Some people have suggested the pads are moving but the pads and discs are reasonably new so shouldn't be moving yet. Any ideas 
    • By Farqui
      Rather than keep updating my New Members thread I figured a build thread would be a more appropriate place to keep track of my changes. Especially as Robb/Mod's went to the trouble of opening up this new section for us.
      January 24th'17 - GS 450H purchased 

      This is my first Lexus, my first hybrid and it's such a joy to drive with plenty of power and it's very slick CVT gearbox.  For a big car it goes/stops and handles surprisingly well.
      The rear boot space was the only concern but with just me and mrsF it's worked out just fine and 6 months down the line we've made a couple of trips over to Belgium without any issues.
      So lets have a brief recap of the initial 6 months of ownership. 
      The car came with a spare key but it wasn't working, thankfully a new CR 1632 brought it back to life #phew      
      January 31st - Lexus Full+100 service @Lincoln, including a Hybrid health check - was successful and warrantied for another 12 months  
      The Lexus health check listed these items...
      both front tyre valves leaking - the OSF definitely is, around the base of the TPMS sensor. I can't see any leaks on the NSF rear brake pipe corroded - all I can see is a small rub on each side, looks like the inner arch has rubbed the pipes slightly front shocks leaking from body - all four dampers are bone dry tho! - I look forward to hearing what Lexus have to say about this exhaust blowing at 'Y' section - agreed, discussing this with the dealer that sold the vehicle exhaust also has a slight leak from the mid section - I couldn't get underneath sufficiently today to check this    Not the best of starts but I was prepared for some work to get an older car 'straight'.

      February 7th new wiper blades    
      Feb 11th, lowered bonnet bump stops that were preventing the bonnet from closing without a really good slam.    
      Updated the OEM satnag, using - now the local roads appear. This supplier has the UK/Belgium/etc countries all on a single disk  unlike other providers or OEM (over several disks)  I needed to disconnect the 12v Battery to get the replacement DVD to load.    
      Feb 14th, dashcam fitted, a Thinkware F770 dual channel that I'd been using in my previous steed.  Hardwired into the AUX circuit via a piggy back fuse on the drivers fuse board. Earthed to the forward fuse board bolt. As the fuse board is well recessed, I've left the cover off for the moment but I may cut a slot in later and then refit the cover.

      Routing the cable was quite easy and only needed the drivers side end of the dash un-clipping.  The cable was then tucked in the drivers A pillar and roof lining, up and over to the camera. Excess cable was looped up, cabled tied and tucked under the carpet well out of the way.
      As the rear sun shade doesn't run parallel to the rear screen (it starts further forward in front of the 3rd brake light) I managed to fit the camera just above the 3rd brake light, higher would have given a better image but that would have interfered with the sun shade.

      The rear camera cable was run around the parcel shelf, up and over the rear door but I couldn't get a neat run around the top of the b-pillar.  So I dipped the cable halfway down the passenger b-pillar, popped off the lower section to loop up the excess cable (out of the way of the seat belt). The cable then went up and over the passenger door and around the top of the screen to the camera.  All neat and tidy (ignore the mirror that was just pushed out of the way to show the camera install).

      Test views, front


      Feb 15th, gave the headlights a quick polish to see how they'd come up.


      Quite pleased how they came our after just a few mins work.

      Cargo net fitted, under the parcel shelf so I still have easy access to the boot (like this sample pic)

      Feb 17th, the car has been up on the ramps today with my trusted local mechanic who gave it the once over with me. All of the shocks are bone dry with no signs of any leaks or misting ANYWHERE. So for now I'm going to ignore the Lexus recommendation LOL
      The exhaust is definitely blowing at the rear Y (see earlier pic).  We also saw that the OSR box has a few issues...

      Pretty obvious huh.  Neither Lexus nor the last MOT flagged it.  It can't just have appeared in the last 3 weeks since I've owned it.  I despair.  The rear section is beyond repair so I bunged my indi some beer money for using him ramps. Looks like I'll be getting a new rear section made up in the not to distant future 
      Feb 19th, new mats fitted, this Luxury version fits a treat

      Gave her a good scrub

      Including the engine bay, no treatment applied yet

      Turns out the passenger footwell has only been blowing cold, giving mrsF cold feet and making her unhappy. Before you ask...yes, we tried all options of Dual/modes/temps/etc. So after surfing for solutions I dived in to check the servos;

      Drastic eh. I eventually tracked down the passenger temp control (passenger side) but with the fixing screws out, I couldn't get the servo out :( With fading light I decided to button it all back up and went for a quick test drive. What'd'ya know, the passenger footwell is now working! The only difference is that I taped up the ducting, both sides, to get a good seal from the heater core. Result.
      The sceptic in me reckons it can't be that easy and that I'll be back under the dash before too long. Which is just as well as I have a few screws left over Never finish up a job in the dark!
      I didn't get anywhere with the heater on Saturday afternoon, so buttoned it all back up and thought the mode control was roughly working.  Nah, on a 5am commute the other morning clear screen setting kicked in (I didn't test that earlier) and the heater did zip all except vent to the rear seats! For the entire 4hr round trip
      At lunchtime I went back to basics and figured out what lever on the heater does what. I also removed the 2 servo's/mounting plate and let them do their thing.  Once I had a grasp of ALL the settings (temp, modes) I set all levers in roughly the right setting, lined the mounting plate to the heater arms (no easy feat), restarted the vehicle and the first test failed
      I have noticed that when you turn off the ignition, the servo's sit for a while and then revert to some standby setting.  I think this has been throwing me off so I removed the servo plate, set all levers in roughly the right setting again, fired up the ignition and let the servo plate settle.  With the ignition still ON, I aligned the mounting plate to the arms for the umpteenth time and gingerly pressed a different mode button...
      The first test worked and the servo's didn't bind. So I tried another mode setting and that worked.  Trying not to freak out, I carefully went through all the possible combinations and to my delight they all work
      The passenger side footwell output is still hopeless tho I think I may know which control needs a slight tweak but then it may just be the way the airflows. So rather than dismantle it all again I reckon I'll buy the mrs a heated blanket/mat or fan to keep her feet warm.
      To help align the 7? heater control arms to the servo plate I found one of these cheap endoscope camera's quite helpful to help see around corners
      Oh and this time there are NO spare fixings left over 

      March 9th
      Yesterday I had the...pleasure? of exploring Leeds city center whilst my car was left at Tony Banks for a new exhaust.  To recap the rear section had the usual split and a gaping hole in the OS muffler, so we definitely needed a new rear section.  I knew the middle section had a slight blow and when Tony removed the rear...the middle section decided to snap in two! He spent around 6 hours (elapsed) crafting both sections from stainless.  The cost of a new center section (with cats) was so tempting that I was already half tempted to get the whole lot done and then I'd never need consider the exhaust again.
      I didn't want any fancy or annoying noise so chose a standard set-up and driving around town you'd struggle to tell this system from OEM.  Under hard acceleration or at dual carriageway/motorway speeds there is a slight increase in noise, which is no bad thing at OEM is really quiet.  The system should quieten down a notch once it's coked up a bit.
      I didn't get back to the work shop before the car came off the ramps so I haven't had a close look at the system but from what I can see it looks dandy.
      The chaps were helpful and have plenty of varied work coming through the workshop, including a steady number of Lexus.  Overall I'm impressed and wouldn't hesitate to recommend

      March 17th OSR tyre flat - punctured, replaced with an Avon ZZ5, managed saved the TPMS and fitted a new valve.  OSF leaking needed which on investigation then a new TPMS sensor. 
      April 2nd, cleaned/lubed rear calipers. OSR stone guard is badly corroded 
      April 21st, paint correction/protection;

      July 6th, fitted 3M tape and a roof rack before the heavens opened. It'll allow me to get back on the bike and hit some nice trails, once I source a carrier.

      Found a great heavy duty bag to store the rack,

      If you want any more details about anything above, then check out my opening thread; 
    • By Stevebrooks
      I have followed all the other suggestions on this sight and others regarding disabling the annoying seatbelt warning gong, but no luck. I have a Gs450h and most of the suggestions are for iS and earlier GS models. Does anyone know how to disable the gong for a GS450h 2012 model?
    • By Odysseus
      I have some proper genuine Lexus mats in excellent, very clean condition in light brown/beige that were fitted my 2008 GS450H.  These were replaced by Lexus as a condition of sale as beige doesn't match the interior of my car - I got black instead.  I'm not 100% sure, but I'm sure they will fit any other GS from 2005 to 2011.
      I would like to swap for some similarly clean and tidy Lexus mats for a GS, but in light grey (my interior is Sussex Grey).
    • By Keleko
      I've got a 2012 GS450h F-Sport and I have to pull the boot lid pretty hard to close it, should it have a soft close boot like my 2008 GS450h did?