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Discussion summary
YOUR RESEARCHHow much front brake drag on C4S...?
Leading reported evidence
Check pad clearance
Suggestion or failed attempt
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Read evidence and context
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Suggestion
Also, with the wheels off you could sight down the calipers to check for pad clearance.
Leading evidence: 'Check pad clearance' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check pad clearance' (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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Suggestion
Have you taken the wheels off and had them checked for trueness and balancing?
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Suggestion
I’d recommend pulling your front driveshafts THEN try spinning your front wheels ...
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Rennlist: 1 discussions
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Generation: 20261026T063944Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all... trying to diagnose a steering wheel wobble issue with my 2003 996 C4S and came across something that I am trying to deem as normal or not. Lifted the car up, thanks quickjack, and my front wheels feel like the brakes are dragging too much. When compared to the rears, the rears spin like the wheel of fortune and complete a few rounds, while the fronts barely make a half rotation when spun by hand. Definitely feels like too much but didn't know if that much resistance up front is common or not.
Anything I can try with the wheels/calipers on to troubleshoot?
This is my first foray into all wheel drive, so I don't know how normal this is.
Appreciate it and thanks so much for any insights.
The front wheels dragging is from the viscous fluid, front wheel drive differential. That it is dragging probably means it is in good working order. If the front wheels rotated freely, it would mean the differential is toast. Have you taken the wheels off and had them checked for trueness and balancing? That's where I'd probably start. Also, with the wheels off you could sight down the calipers to check for pad clearance.
I’d recommend pulling your front driveshafts THEN try spinning your front wheels ...
Failing that, drive the car whilst being gentle on the brakes for ten miles or so. Feel the front wheels close to the hub (but don’t touch the rotors !!) If any/both of the front wheels feel excessively hot, there's a good chance you've got a sticking caliper piston.
Of course the safest way to check is with an infra-red thermometer on the rotors themselves, but that assumes you have one ...
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