Strange sensation/sound on hard braking

[jcp240z]

If it in the calipers also check the caliper to strut mounting bolt. I had a similar thunk and it turned out that the bolts had not been torqued properly. Discovered the cause when the bolt came out, the caliper pivoted and hit the inside of the wheel. ��

[Skeletor]

I have the same problem with the clunk under sudden hard braking applications.

I'm going to agree with the thrust arm bushings. I've had some work done to the front brakes on mine (hoses, calipers, rotors etc.) and the clunk is still there. I did notice that some of the bushings are starting to look tired. The clunk under braking on mine has been around for a while but just recently started making noise on bumpy roads.

I would give the suspension a good wiggle under there and see how everything looks

[Purplefade]

Originally Posted by jcp240z

If it in the calipers also check the caliper to strut mounting bolt. I had a similar thunk and it turned out that the bolts had not been torqued properly. Discovered the cause when the bolt came out, the caliper pivoted and hit the inside of the wheel. ��

Been there done that - actually had my bolt sheer off and the caliper flip forward into the wheel... was all kinds of fun.


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[jcp240z]

No shear, inattentive install but the same result. That caliper flipping and hitting the inner wheel plus the car vearing towards the outside of a turn caused a serious pucker factor.

[fishhouse4]

Outstanding advice here. Thanks much...I knew asking would help point me in a good direction!

Originally Posted by Fifty150hs

A clunk on braking is usually associated with bad thrust arm bushings. Check those.

Going to check this out today!

[fishhouse4]

Ok, forgive me if this is obvious...trying to get my mind out of Jeep Wrangler mode and figure out what all of these suspension parts are.

Are you guys referring to the bushing at the subframe of the upper control arm or "tension strut" as I've see it revered to (shown in blue)?

Or that one shown in green - that I can't figure out what it's called lol? Can't seem to find anything online specifically called "thrust arm".

[andrewwynn]

Real OEM refers to what is typically called the thrust arm as the tension strut.

There is no part listed in the diagram for your your mystery part on my car maybe something was added: put your VIN into RealOEM.com and look at the parts diagram for the front axle.

Seems to be attached where the anti roll bar is: do you have active suspension on your truck? I know some models have a hydraulic ram on the anti sway bar to lean into curves. I've not seen how that attaches.

[andrewwynn]

My bad that *is* the (anti) sway bar.

What you have labeled as the sway bar is the anti sway link. The sway bar aka stabilizer is the thick staple shaped bar that is connected via links up to the strut.

Reviewing the photo it looks like the bolt for the lower arm is loose. It also looks like the tension bar is new which would make it less likely that's the problem but I would suspect it anyhow.

Thunk in the trunk as mentioned could be the rear subframe but if that is loose you should hear small thunks when under power and hitting small bumps

[wpoll]

The part you need to check is the large bush at the chassis side (front) of the upper control arm/tension strut (in blue). Checking it may not reveal much movement but trust us - it's the most likely source of your clunk when you dab the brakes.

[andrewwynn]

This is the prime suspect. If you hold your phone out the window and take a video of the wheel, if the bushing is shot the wheel will lurch backwards when you hit the brakes going say five mph