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Maintenance & Repair Stop here! Let's talk about brakes
1867 messages, Last post on Nov 26, 2009 at 6:20 PM
You are in the Maintenance & Repair Forum. Your Host is mr_shiftright
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Replying to: bolivar (Aug 15, 2008 11:07 pm) There may be a different or continuing whoosh that indicates a leak. |
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Replying to: bolivar (Aug 15, 2008 11:02 pm) BTW, what do you think about this claim that warpage is a myth and the symptoms of it are actually due to "friction pad material transferred unevenly to the surface of the disc"? I found our Ford dealer currently has a coupon for a free brake check, so I will see what they say on Monday. They did all four brakes about 1.5 years/15K mi ago. |
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Replying to: jeffyscott (Aug 16, 2008 8:00 am) You feel the warpage the most the slowest the slower you get. Back to the analogy, if the ceiling fan is spinning slowly, you can see the blade that is bent lower. If you turn on the fan real fast, you can't distinguish the blade that is out....it just looks like the whole fan blade pack is wider. Anytime I've had warped rotors I could feel them when putting on the brakes to slow starting at about 30mph down to 5. Having had (and personally replaced) a number of warped rotors over the years in our vehicles....warped rotors are definitely NOT a myth. The last were a set on our heavily laden Suburban that we had taken thru the mountains and overheated the rotors on some long downgrades.
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Replying to: jeffyscott (Aug 16, 2008 8:00 am) 1) rotor warpage. (can often be felt in the steeringwheel too) 2) pad-material transfer to the rotors. 3) excessive rusting of the rotors. Also bad wheelbearings can cause a kind of pulsating feeling during braking too.
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Another assessment worth making is to do an informal cost analysis projection. Forget the paper, pen, calculator, etc.,  and just consider the age of the brake rotors and pads, the number of miles they have been on the vehicle, etc., as you decide whether to consider resurfacing rotors versus replacing them. Short lived rotors are good candidates for upgrading. Better quality pads may last longer, etc. At this point, I am subscribing to the philosophy that if a rotor truly needs machining, it is far better to replace it and the pads at the same time. I also would do the same repairs to both sides of the front together, and both sides of the rear together. That is, I would not run new brake parts on just one side of either the front or rear.
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Replying to: wtd44 (Aug 19, 2008 6:07 pm) With over 90,000 miles on the originals, the cost of $300 for the new parts was worth it.... knowing I will get another 90,000 miles on it before I need to do it again. I orderd REAL German-made parts for my wifes VW.... no cheepo China or Mexico parts for my cars. Experience has shown me that el-cheepo rotors will rust/warp very quickly.
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Replying to: bpeebles (Aug 19, 2008 6:16 pm)
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Replying to: kiawah (Aug 16, 2008 11:50 am) http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml |
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Replying to: bpeebles (Aug 17, 2008 1:46 pm) I am going to get a second opionion next month when I get an oil change. I don't think I need to do the rotors as the brakes seem fine other than the pulsating at the end. I did a couple hard stops and they stop the vehicle smoothly without any apparent problems no "warped" rotor feel just the pulsating issue below 10 mph. I think the rotors probably looked bad just from lack of use...the vehicle has been idle a lot of the time the last few years and has only 20,000 miles on in the 2.5 years since the brakes were done. The first two sets of front brakes had each gone about 50,000 miles. |
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I suspect we refer to brake pulsing as warpage simply because our "mind's eye" conjures up the image of what the condition makes us think might be the cause. That is, our imaginations tell us that a rotor with bulges in it would make the pulsing brake feeling when the assumed bulges attempt to spread the clamping pads apart. One might more correctly say, "My brakes pulse as though the rotor has thicker and thinner places rotating into contact alternately with the evenly held pad spacing, and sometimes I can feel it in my foot." At this point in time, we all seem to understand what others mean when they tell us they have warped rotors, even though it is likely an inaccurate use of terminology. What we need now is technology that abolishes the problem altogether! 
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