GLoc GS-1's Clunk Around

[galaxy]

Ugh…my GS-1’s clunk when I change directions. It. Drives. Me. Bonkers. The pads are amazing and do everything I want them to, but when I’m at parking lot speeds, they clunk into position during that first pedal touch when changing directions. For example….

backing out of the driveway and touch the pedal; clunk. Subsequent pedal applications, no clunk. Start to drive forward and touch the pedal the first time; clunk. Subsequent pedal applications in that direction, no clunk.

It’s almost enough for me to want to swap out pads. And I’ve wondered since day one if it’s because GLocs don’t have any type of backing plate. And the backing material from the original pads won’t come off to swap over.

Other than that, the GS-1’s are exactly what I want. ZERO noise, darn near zero dust. Great braking.

Anyone else ever hear of this? Any ideas? I've bled the brakes multiple times to no avail. GLoc has sent me replacement pads which didn't change anything. Whatchu guys think?

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[luc]

All pads have backing plates, it’s the metal part that the friction material is affixed to
Anyway your problem is not lateral play but rather front to rear

 

[ModularKid21]

I’ve had the gs1’s on my car for about 12k miles and I haven’t heard a single peep out of them. With every install correctly, there really isn’t any room for movement aside from in and out with the pistons.

Edit: next time you have the wheels off, I’d poke around and see if you can get them to move or replicate the sound

 

[galaxy]

All pads have backing plates, it’s the metal part that the friction material is affixed to
Anyway your problem is not lateral play but rather front to rear

Fair enough. Terminology. Some/most pads have 'something' on the back of the backing plate then. An additional plate or material. These do not.

Correct about the front to rear play; figured that was a given. That part was not a question. But you can't feel anything by had that would account for the amount of noise.

I’ve had the gs1’s on my car for about 12k miles and I haven’t heard a single peep out of them. With every install correctly, there really isn’t any room for movement aside from in and out with the pistons

Yeah, that's what I would think. And I wont say never, but on these factory Brembo's, dang, there's really no way to screw up a pad install. I mean, how much simpler of a brake job can there be?

 

[luc]

Fair enough. Terminology. Some/most pads have 'something' on the back of the backing plate then. An additional plate or material. These do not.

Correct about the front to rear play; figured that was a given. That part was not a question. But you can't feel anything by had that would account for the amount of noise.




Yeah, that's what I would think. And I wont say never, but on these factory Brembo's, dang, there's really no way to screw up a pad install. I mean, how much simpler of a brake job can there be?

I really doubt that you screwed up the install. Do you still have the old pads by any chance to compare the glock to it ?
Are the calipers bolts torqued correctly?
Hard to diagnosis on a forum but the first thing I would do is to measure the length of the backing plate
The factory backing plate are 18.9 mm long

 

[galaxy]

Yes, I have the old pads. I even thought about reinstalling the factory pads to see what happens, but haven't felt like going through the hassle yet. I was pretty sure I compared them to the stock length when I swapped out the replacement set, but maybe not. But yeah, i agree; tough to do on here. Was mainly curious to see if anyone else had experienced this.

Yes, everything torqued correctly. And this is occurring front and rear BTW.

 

[Roadway 5.0]

Did you install new anti-rattle clips with your new pads? Old and worn clips have caused me similar problems over the years with various cars:

https://www.cjponyparts.com/raybest..._Wc0txGzDSmoklFFlF5a-1-7pg_Yji2saAoYrEALw_wcB

 

[Roadsign]

A friend recently installed the GS-1's and called me with the same complaint. This was right after the install and bed-in. I suggested he do some more hard braking, not necessarily a full bed-in process. That solved the issue for him.

 

[galaxy]

A friend recently installed the GS-1's and called me with the same complaint. This was right after the install and bed-in. I suggested he do some more hard braking, not necessarily a full bed-in process. That solved the issue for him.

I've done that. 8,000 miles on mine. No change.

Did you install new anti-rattle clips with your new pads? Old and worn clips have caused me similar problems over the years with various cars:

https://www.cjponyparts.com/raybest..._Wc0txGzDSmoklFFlF5a-1-7pg_Yji2saAoYrEALw_wcB

I did not. I installed them on the car fairly new. Stock ones were clean and in great shape (at the time). I did/have wondered if that would be a culprit, but don't see how they'd stop any fore/aft movement. IDK.

 

[galaxy]

So, completely flushed the system today. Did a normal flush with my Motive power bleeder. Nothing cosmic. Thought most of the clunking was coming from the rear, so I reinstalled the stock rear pads on that end. It made very little, if any, change. And can certainly tell the clunking around is coming from all four corners.

I inspected the pistons and everything in the rear and can find no problems. Every thing moves freely and work great. Pistons extend in and out without issue. No damage to dust covers or anything.

Weird part is the rear pads feel like the pistons are retracting too far when you take your foot off the pedal, but have no idea what would cause that. When you release your foot off the pedal, you can push the pads around in the caliper.

I dug through some old photo's and was able to decipher that the clunking did in fact start with only a pad swap to the GLoc's. I don't want to run factory pads anyways, so I ordered some Z26 pads to swap all four corners and see what happens.

So far, there's no logical explanation for my issue, if it's in fact the pistons retracting a tad bit too far when you release the pedal. They shouldn't move at all. Question then would be what on earth would cause that, and what can I check against it?

 

[NightmareMoon]

Is it the rear only? Is it one side or both? Does it sound like a low frequency clunk or a high frequency metallic ping?

I run GS1s.

 

[86pagt]

I have been chasing this problem for 5k miles but it’s with the OEM Brembo brake pads. I first noticed it in a drive thru when pulling forward and hear it all the time now. I hear it from the front drivers side nothing from the rear. I used a drive on lift, loosened everything and retorqued, strut top and lower, caliper,control arms, sway bar links, wheel spacers, wheels. I pulled the pads cleaned and reinstalled. Still have it and it is annoying. I lowered the car with BMR min drop spings and drove at least 5k before this started. I’m now leaning towards maybe a control arm but it has 20k on it now and start around 15k so I would think they would be ok….

 

[NightmareMoon]

I have been chasing this problem for 5k miles but it’s with the OEM Brembo brake pads. I first noticed it in a drive thru when pulling forward and hear it all the time now. I hear it from the front drivers side nothing from the rear. I used a drive on lift, loosened everything and retorqued, strut top and lower, caliper,control arms, sway bar links, wheel spacers, wheels. I pulled the pads cleaned and reinstalled. Still have it and it is annoying. I lowered the car with BMR min drop spings and drove at least 5k before this started. I’m now leaning towards maybe a control arm but it has 20k on it now and start around 15k so I would think they would be ok….

Get an audio clip we can listen to. Hubs can make a noise at low speed when starting and slowing, would be able to tell if its that if we can hear it.

 

[galaxy]

Mine is most certainly front and rear. And even though I can't be on the other side of the car, it certainly sounds like all four corners. Feels like it to. (but yea, need to get someone on that side to verify).

It also crossed my mind that it could be the two piece rotors. Even though when I flushed the brakes the other day, they did not budge on the hat. Possible that initial clamp down on the rotor is making the disc clunk? IDK. You almost feel it though; it's in the brakes. It's not a hub. I would think there would be other signs and symptoms if it were a hub. And for a hub symptom to rear itself at all four corners at the same time? Pretty remote.

 

[86pagt]

Same here definitely can feel in the pedal… and can make it do it by quickly being on and off the pedal. To me sounds like if the rotor holes would be elongated or ovaled and the studs from the hub would be hitting the rotor…. My rotors are good… hopefully I can get a sound clip somehow and post it. Nothing seems to be affected…. Stops fine steers fine just very annoying

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