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Discussion summary
YOUR RESEARCHHowling noise when braking
Leading reported evidence
Replace when
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
Porsche recommends the caliper bolts be replaced when changing out the rotors, but I�m not sure all mechanics will actually do that.
Leading evidence: 'Replace when' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Inspect rotors' (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.
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Turns out the Audi shop I used put on the lug nuts, but never properly torqued them on one wheel.
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Suggestion
You can visually inspect the rotors for overall condition.
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Suggestion
The only time I get a clunk from my brakes is at low speed when changing direction from forwards to backwards because the brake pads shift position and the pads stoppers hit the calipers.
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Suggestion
The only time I get a clunk from my brakes is at low speed when changing direction from forwards to backwards because the brake pads shift position and the pads stoppers hit the calipers.
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11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Had my car out for a nice post storage romp yesterday. I noticed a sort of howling sound when braking from higher speed. Didn't hear it under normal driving. Could it be condensation in brake lines or something ? Pads look OK. Fluid was flushed a year ago. Thoughts appreciated. Thanks!
It could be rust on the rotors from sitting all winter. Did the sound die down after a while? My brakes made the same noise, but it eventually went away.
Stock brakes. Car has 58k miles. Assume this is the second set. I've had the car only 1yr. I do note that the front rotors have a slight lip at the inner and outer edges.
Puzz1,
Never heard howling. No idea what it could be. If you can, record it and post it, someone may have an idea. Ive heard just about every noise come from my brakes, including a branch that somehow got wedged between my rotor and wheel, bad brake pistons, squeeling brakes and bad bearings. Hope you can find it. Even though you only have 58k on the car, it's always good to pull the wheels off and take a hard look. It's always something silly that in hindsight was simple.
A good Indy can probably find it quickly.
A warped rotor is felt in the brake pedal. Does the brake pedal pulsate when depressed while driving (not to the point where you activate the ABS)? It should not make a clunking sound. A clunking sound could be caused from loose hardware (caliper bolts, wheel lug bolts, broken brake pad, worn or loose suspension part, etc. It's best to find it before something catastrophic happens on the road.
I would get this checked out asap. You don�t want to risk a safety issue.
Porsche recommends the caliper bolts be replaced when changing out the rotors, but I�m not sure all mechanics will actually do that. The bolts are torqued to spec: 63 ft-lbs.
A lip on the rotor is normal wear. The pads often do not go all the way to the edge. You can visually inspect the rotors for overall condition. You can measure the rotor and brake pad thickness. There is guidance on the size of the lip.
The only time I get a clunk from my brakes is at low speed when changing direction from forwards to backwards because the brake pads shift position and the pads stoppers hit the calipers.
Good advice from Mike. Tough to diagnose with out hearing it, but you may want to also check and make sure your lug nuts are torqued. Had an experience once where they were loose on my Audi S8 and made unusual clicking/clunking sounds. Fine when driving in a straight line, but didn't like braking and turning. Turns out the Audi shop I used put on the lug nuts, but never properly torqued them on one wheel. Silly mistake that ended up being harmless since I caught it early enough.
+1 on wheel torque. My highlander front wheels have loosened a few times. May be from the tire shop torquing them to the point where they stretched the studs. I still carry the cross wrench just in case and check them often.
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