I installed new brake calipers and pads in the front on my 1.7L 914 (1972) after I discovered that one of the calipers was sticking. The calipers were high quality rebuilds from PMB.
Now I have this super annoying grinding noise whenever the car is moving. The noise is like something is grinding against the pads. It is there no matter if I press on the brake (hard or soft or at all), but it gets a bit louder if I step on the brake.
I suspect that the new pads are a bit wider than the old ones. When looking at my disks again today I noticed that there is some surface rust on them, about the first 1/4" both from the outside edge and from the inside. I know I should have had my brake disks turned when I changed the calipers, but did not do it.
My question is: will this annoying noise go away with a bit more driving, after the pads wear out a bit, or do I need to remove the calipers again, take the brake disks off to be turned, and reinstall everything?
Sorry for the low quality pic...
Sounds like you went top shelf with restored calipers from Eric with new pads. Those rotors should be replaced with new ones. I wouldn't turn any rotor these days as new rotors aren't that expensive and turned rotors are now that much thinner.
Replacing rotors also gives a good look at the bearings too. Maybe replace those as well and have all new rotating and brake components up front.
Venting clearances set, right?
I’ve always taken new rotor to the machine shop and had them turned first. I figure it’s best to start with a straight surface and I do t think you get that out of the box
More often than not, the rotor runout is less than minimum spec after turning. Redo...with new bearings. Then you can forget them til next time.
I once picked up an early 911 that just had brakes done, by a reputable shop. Grinding the whole way home. Found one of the pads was put in backwards....
Double check the pushrod adjustment from the pedal to the master cylinder. The pushrod nose should have 0.040 (1mm) between the m/c piston. Rock the brake pedal back and forth gently, should have tiny bit of movement. If no movement rod is too long, excessive its short.
I don't know, maybe I had a bad day and I put the pads in backwards. But I don't think I had such a bad day to put them in backwards on both wheels... Still, I'll check tomorrow.
(The car makes the same exact noise when spinning either the passenger or the driver's side wheel...)
Its gotta just be the built up rust on the rotors. It will go away with driving a little bit.. Same thing went on with my sons 944.
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