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Car Forum / Nissan / Nissan Maxima / June 2004Brake noise - slotter rotors?
'97 Maxima SE, 170k miles. When the car had 122k miles, I replaced the front stock rotors with Powerslot slotted rotors, and put in new OEM pads. All was well, until recently I started hearing grinding or whirring noise under braking. I checked the pads and the rotors, and there are no visible defects, the pads are worn about half way. I'm thinking, could this be due to the fact that the new pads have slanted edges, which only go approximately half way into the thickness of the new pad? Thanks for any insight! Fil > '97 Maxima SE, 170k miles. > [quoted text clipped - 7 lines] > edges, which only go approximately half way into the thickness of the new > pad? The leading edges of the pads are probably catching the slots, you will need to bevel the leading edges of the pads to stop it.  SignatureSteve http://www.atlantaracing.com Thanks, that's what I was suspecting too. Is it going to affect braking if I leave it the way it is? I am not too worried about the noise. > > '97 Maxima SE, 170k miles. > > [quoted text clipped - 10 lines] > The leading edges of the pads are probably catching the slots, you will need > to bevel the leading edges of the pads to stop it. > Thanks, that's what I was suspecting too. Is it going to affect braking if > I leave it the way it is? I am not too worried about the noise. Might end up chewing up the leading edge of the pads? Then again might not do anything.. Drilled rotors make weird noises but don't hurt the pads. SignatureSteve http://www.atlantaracing.com > > Thanks, that's what I was suspecting too. Is it going to affect braking if > > I leave it the way it is? I am not too worried about the noise. > > Might end up chewing up the leading edge of the pads? Then again might not > do anything.. Drilled rotors make weird noises but don't hurt the pads. I thought the original poster stated that the pads had a beveled "edge" already - from the first post: > > I'm thinking, could this be due to the fact that the new pads have slanted > > edges, which only go approximately half way into the thickness of the new > > pad? This wouldn't be the first time I've read about drilled/slotted rotors causing clicking/grinding sounds... Not really sure that there is any need for that sort of rotor (anything other than a blank) on our cars... but thats a discussion for another day. Just out of curiousity, are slotted rotors directional? I can imagine that if the slots are cut (direction of slot) in the opposite direction to the rotation of the disc (going forward) - you might have more of a grinding/cutting effect... hard to explain in words, but I think you get the gist right?... (most likely I'm blowing smoke ;) ) Nirav 96 Max GLE, 106k >> > Thanks, that's what I was suspecting too. Is it going to affect braking >> > if I leave it the way it is? I am not too worried about the noise. [quoted text clipped - 9 lines] >> > slanted edges, which only go approximately half way into the thickness >> > of the new pad? Reread the post, the pads are now worn half way down PAST the beveled part.. SignatureSteve http://www.atlantaracing.com > Reread the post, the pads are now worn half way down PAST the beveled part.. Yes indeed. Thanks for setting me straight Steve. Nirav 96 Max GLE, 106k Thanks for your reply, Yes, they are directional, they have different part numbers, and the boxes were marked appropriately. Though, I do see a Saab in the parking lot where I work with slotted rotors that look like they are cut in the same direction on both sides. Could be just for looks, or maybe someone screwed up. > > > Thanks, that's what I was suspecting too. Is it going to affect braking if > > > I leave it the way it is? I am not too worried about the noise. [quoted text clipped - 22 lines] > Nirav > 96 Max GLE, 106k Why would direction matter? My neighbor's Mercedes (C500?) has factory cross-drilled rotors and they have the same directional pattern on both sides - i.e. driver's side 'swoops' forward and the passeger side goes backwards. >Thanks for your reply, > [quoted text clipped - 3 lines] >cut in the same direction on both sides. Could be just for looks, or >maybe someone screwed up. >> Just out of curiousity, are slotted rotors directional? I can imagine >> that if the slots are cut (direction of slot) in the opposite [quoted text clipped - 4 lines] >> Nirav >> 96 Max GLE, 106k I don't know if it matters. From what I've read elsewhere on the web, the grooves help vent the gases away from the pad surface. I am just speculating here, but depending on where the calipers are located (on the front side of the rotor, or on the back side, or, in some applications, on the bottom side, to lower center of gravity), it may be benefical to have grooves go in certain direction, so that forward movement of the car helps draw the gases away. It may be that this is all done just for looks on a road car, hence the non-directional rotors on your neighbor's Mercedes. I'd imagine, their engineers know better. Again, I was just speculating... > Why would direction matter? My neighbor's Mercedes (C500?) has factory > cross-drilled rotors and they have the same directional pattern on both sides - [quoted text clipped - 16 lines] > >> Nirav > >> 96 Max GLE, 106k I am just speculating > here, but depending on where the calipers are located (on the front side of > the rotor, or on the back side, or, in some applications, on the bottom > side, to lower center of gravity), it may be benefical to have grooves go in > certain direction, so that forward movement of the car helps draw the gases > away. Or push the pads in a specific direction under braking. I have also seen discs with directional internal vanes, such as Corvettes, which must be oriented properly for cooling purposes but never that fancy on a Maxima. Matthew 01 Max SE |
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