z-maro

iTrader: (18)

Well I started getting a clunking noise sometimes when braking from around 40 to 25 mph with the clutch pushed in, and intermediate pressure on the brake pedal. I noticed this after I got new tires and painted the brake calipers and rotor hats. I originally thought this was a driveline issue, but after further investigation I believe it is a brake issue.

I went to verify that the slide pin bolts were at 27 ft-lbs and the top one on the passenger side just sat and spun, so I assume it is stripped. It also looked like the little rubber cover also was spinning on this bolt (shown in the picture below). I noticed that the calipers do not seem to have as much side to side movement as the ones on my fathers car. Maybe greasing the pins would help this and fix my clunking sound?

What would be the symptoms of a sticky slide pin?

sleepinghawk

Not sure why your pins are sticky, did you see rust on them? I just went thru this break down heading to the beach on Interstate 64 with all those bumps! Heard a clunking sound after hitting a bump in the concrete then a metal sound (2 screws coming off). Pulled over and saw my brake moving and there were no bolts holding the pins in. Long story short, walked 3 miles to a Autozone and got new ones. Used locktite and fixed driver side and checked passenger side. My slides moved freely, and I had never taken these bolts out before. I just sprayed my pins lightly with lithium grease spray.

FirstGen F-Body

iTrader: (3)

if you cant get the slide tightened to spec make sure the slide flange is locked into the caliper when tightening. If it dosent lock in you can grab it with a wrench or vice grips. Some cars you need to do that to tighten the caliper. If the bolt still spins its stripped
dose it go away with heavier braking?
my monte carlo clunks with light braking, once i brake a little heavy it goes away. The slides have play, if i grease the slides it goes away for 6 mths to a yr. I need to get a new bracket n slides but since it dosent affect braking id rather put the money into the camaro

Rob M

iTrader: (1)

I have occasionally gotten/heard something similar on my '02 as well. I did slotted rotors, Hawks pads & the rims Years ago. I fired up my compressor yest with the pic above in mind and went searching for a loose bolt or something backed off and didn't find squat

z-maro

iTrader: (18)

Yes it does not happen with harder braking. Is there a good write up on how to grease the slides? Do you have to remove the calipers?

I still haven't figured it out, and I can't even be 100% sure on where it is coming from. The car has factory blank rotors.

meeklay812

iTrader: (6)

I had a clunk when breaking after getting out of gear, and it ended up being the torque arm bushing. When the weight/momentum would transfer while decelerating, the torque arm would move around a bit. $15 fix. Also maybe check the tranny mount or possibly the U-Joints.

If you think it's coming from your brakes, its possible the pads are moving within the caliper, causing a clink.

z-maro

iTrader: (18)

That is what I am also thinking it could be. I have been looking at this thread, and would like to try something similar as I believe I do get some extra noise from the rod end on the MWC torque arm.

https://ls1tech.com/forums/gears-axl...orque-arm.html

Darth_V8r

iTrader: (4)

I've had several cars clunk when braking. Every time, it turned out the top shock bolts needed a quarter turn. Noise gone

Rob M

iTrader: (1)

Good food for thought! Even better avatar Darth As well as the Torque arm suggestion.

...In my case neither will matter as I'm getting to do the parts install part of a lot of my suspension & chassis

brigade24

+1. First thing i thought of.

The abutment bracket shims don't really hold the pads tightly in the bracket so they might make a clunking sound when the brakes are applied.

i tried adding a single shim to each bracket on each side and the clunking stopped but the pads were hard to move so i'm still trying to figure out which is better.

z-maro

iTrader: (18)

I think this fixed the problem, thanks a ton! I was getting so frustrated with this, I'm glad it was an easy fix. The bolts must have loosened over time since I added a STB a few winters ago. I may add a little loctite if it becomes an issue again.

Darth_V8r

iTrader: (4)

I feel you. First car it happened on I tore the front end apart three times trying to figure it out. Second car, I only tore it apart once. Third time I went straight to the shock towers.

If only there was a website that people with ls1 powered cars could post when weird stuff like that happens to help others with similar problems