What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[cfmistry]

Usually, but worth checking. Something is going slack and then taking up slack when slowing and going. If the front differential mounts are good, motor mounts are good, and calipers seem to be sliding, I’d be looking at all other parts of the drive train just to be sure.

No tears, the look good, and I don’t hear any noises when spinning the wheels in the air.

 

[cfmistry]

Have you checked your caliper sliding pins? Sounds brake/caliper related to me.

I checked them today and re-greased them. No issues.

 

[GreyStone]

So paying real close attention, the clunk is when I let off the brakes after moderate-hard braking. Before I even touch the accelerator. Makes the engine mounts a less likely source right?

Maybe it's your front suspension - when you brake moderately the front end goes down and then comes up on release. - What year truck do you have? Check your exhaust manifold bolts too.

 

[PG01]

I checked them today and re-greased them. No issues.

U joints

 

[George B]

Maybe it's your front suspension - when you brake moderately the front end goes down and then comes up on release. - What year truck do you have? Check your exhaust manifold bolts too.

This made me think strut mount.

 

[George B]

This made me think strut mount.

Could even be the sway bar in the bushings.....

 

[cfmistry]

Sway bar bushings are new. Struts and mounts are original with 170k on them... could be the culprit, but how to test??

 

[cfmistry]

Thank you to everyone for the help.

So to summarize...

Light clunk noise when coming off the brakes (sounds like the front left). Both in forward and reverse. Don't have to touch the accelerator to hear it.

Caliper sliders are lubed up and in great shape. Rotors and pads have plenty of life left.

New control arms, new tie-rod end, new sway bar bushings. Front diff bushings look in good shape.

I will have my wife turn the steering wheel around and listen for strut bearing noise. Other than that, I can only assume it's a sticky caliper??

 

[Rocket Man]

View attachment 251594

Thanks for that, can’t get that image out of my head. Is that really you? Wondered what you looked like lmao.

 

[Tonyrodz]

Thanks for that, can’t get that image out of my head. Is that really you? Wondered what you looked like lmao.

BUSTED!!