16 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBrake Pad Movement?
Reported or suspected cause
similar
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
If that doesn't help then the problem is similar to BMW application where the backing plate of Akebono pads are undersized.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
But I just went to check the pad seating on the rotors and noticed that the hole on each brake pad (that the caliper spring clip pin goes through) is about 1/8" bigger than the pin itself.
Leading evidence: 'similar' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'similar' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check pad seating' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
But I just went to check the pad seating on the rotors and noticed that the hole on each brake pad (that the caliper spring clip pin goes through) is about 1/8" bigger than the pin itself.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Not sure about the clunk, but the clips should always be replaced and lubricated every brake job.
Replace caliper spring clips as their age is unknown
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I've speculated that I should probably consider replacing the caliper spring clips as their age is unknown.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check pad seating
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
But I just went to check the pad seating on the rotors and noticed that the hole on each brake pad (that the caliper spring clip pin goes through) is about 1/8" bigger than the pin itself.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
16 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I need some insight here. I did a total brake job on the '99 this fall including new rotors, pads, lugs, fluid, sensors, and lines. I reused the caliper spring clips, pins, and pad dampeners. Ever since I completed the repairs, I get "clunk" noises from what seems to be most if not all 4 of the brakes whenever the car moves for the first time after having sat for a few hours.
At first I thought it might be caliper piston retraction, but I've verified that the pads are still sitting flush on the rotor faces. I've speculated that I should probably consider replacing the caliper spring clips as their age is unknown. But I just went to check the pad seating on the rotors and noticed that the hole on each brake pad (that the caliper spring clip pin goes through) is about 1/8" bigger than the pin itself. The pins all fit perfectly into their respect guide hole on each caliper so the pin sizing is correct. I don't recall how big these guide holes were on the old brakes. Can anyone offer insight to my problem? I imagine the pads are floating a bit in the caliper because of this larger hole on each pad.
Is the car wet at all (or even just in a humid environment) when you park? It's very common for the pads to rust to the rotors overnight if it's AT ALL moist. They'll then "break free" when you first move the car, making a clunking noise. Perhaps your new pad/rotor combo love each other more than the old set did, and are more prone to becoming one overnight.
If it's clunking only after sitting for many hours, I wouldn't worry. If it clunks every time you leave from a stoplight, something is wrong.
The fit of the retaining pin shouldn't really affect the positioning of the pad in the rotational direction or inward on the radius; those directions are controlled by the pad backing plate riding on the caliper. All the pin does is prevent the pads from moving outward along the radius and falling out of the caliper.
No rust or corrosion on the rotor surfaces. Car does it when it's bone dry. It really does make me think that maybe the spring clips are simply weak from age?....
When you say "spring clips" what do you mean? The cotter pin that goes through the retaining pin? Or do you mean the dampers that go behind the pads and into the piston recesses? I've removed those from my car entirely and can sense zero difference, so I'd suggest removing all those if you think those could be the source of the noise.
The retaining pin and cotter pin shouldn't really be able to "weaken" with age. If they are not all rusty and falling apart, they're fine. All they do is hold the pads from jumping out of the caliper.
Ah, yes. I supposed it's possible those are worn out, but I'd be surprised. Mine were totally rusty and gross-looking so I bought new ones, but the new ones weren't really any stiffer; just prettier.
I think he is referring to #15 in the diagram, the spring and retaining pin. I always replace those when I do a brake job. I agree about the pads sticking after a car wash or if they get soaking wet. When I back out of the garage after having washed the car the day before, I get a really good clunk from all four wheels. So sometimes I take the car for a short drive after washing and that seems to do the trick.
http://www.autoatlanta.com/porsche-p...section=602-00
Akebono pads are known to klunk on BMWs due to the floating caliper design and the undersize of the back plate of Akebono pads. However 911s have an entirely different caliper design and as long as the pads fits into the slot, the retaining spring should wedge it against the caliper. I would suggest pulling the pads out and apply some hi-temperature grease where there is metal to metal contact. Use it sparingly to avoid getting it on the pad surface. If that doesn't help then the problem is similar to BMW application where the backing plate of Akebono pads are undersized. It is unfortunate because Akebono ceramic pads are very good and dust free for street driving, but the clunking noise although won't hurt performance is quite annoying.
I have a set of calipers on the bench with what I believe are Textar pads. There seems to be a snugger fit between pad/pin than shown in your pic but I'm dubious if that's the cause of you noise.
Disagree. It's just a spring. No need to replace it unless it's broken or near-broken. Certainly not on every pad change. Maybe once every 20 years or so to be conservative!
Update: All is well now after removing the pads, making sure everything was secure, and adding more Cerami Glyde than I had previously done. The brakes work perfectly now and have zero noises.
This is a source reference. Confirm exact model applicability in the original material.
