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Registered
Join Date: Jun 2009
Posts: 299
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Turned Rotors = New Pads?
At highway speeds, when I step on the brakes, I get vibration and audible noise, which led me to measure the run out on the brakes. There were no noises or vibrations at lower speed.
The run out was marginally over - 1mm is accepted, I had 1.25mm or 1.5mm on two corners - so I'm going to have the rotors turned. My question is, do I really need to install new pads when I do so? The existing pads have tons of meat, and I suspect the car sitting (4000miles over last 7 years) warped the rotors rather than pad issues. I know sellers would prefer to sell new pads and rotors every time around. PS - Is there an equivalent 'shaving' for pads, as with turning rotors?
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2002 C4S 105kmiles Boston MA |
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05-23-2013, 10:07 AM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Two options come to mind if it were me. First would be to be very easy on the brakes at first to wear the pads flat, as the ridges in the pad on flat rotor will make hot spots and glaze the pad and overheat the rotor in spots. Option 2 would be to use a file, or just a flat spot on the driveway if it's smooth concrete and use a circular grinding motion to wear the surface flat. The pads will still have to be worn in to the rotors, but I think there would be much less risk of spot glazing/overheating the pads/rotors. If it were me, I would just grind them down on the driveway as described. If they're cheap pads, just take it as an excuse to upgrade to some EBC red stuff, etc.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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05-23-2013, 10:14 AM
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944 addict
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What kind of noise were you hearing: Squealing, rattling, moaning, etc? Were the pad thickness after turning the rotors going to remain within the safe tolerances? There's numbers on the edge of the rotors to let you know the limits. Pads, if fairly new can be refinished (honed) on sand paper of fairly fine grit, i.e, 100 or finer, to take the glaze off. Make sure it's on a good flat surface like a table or you stand the chance of sanding a groove into the pad. Make sure to not sand too much....only enough to take off the glaze.
The noise issue is another matter. If it's a rattle it could be a number of things from loose calipers to control arm bushings. Also consider wheel bearings, tie rod ends or strut bearings. If it's a squeal it might even be the dust shield. Good luck with the project.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman. Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved. |
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05-23-2013, 10:21 AM
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Registered
Join Date: Jun 2009
Posts: 299
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Noise was the same as the vibration - it wasn't a squeal or other rattling - just whump whump whunmp in time with the vibration.
Good advice re pads will do.
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2002 C4S 105kmiles Boston MA |
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05-23-2013, 10:23 AM
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Porsche 944 NA
1986 Porsche 951
