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Car Forum / Dodge / Dodge Cars / November 2004What are "glazed brakes"?
I have a 2001 Grand Caravan. Last December I paid the dealer $400 for new rear brakes. Last April the brakes were squealing, and he adjusted them at no charge. Now they are squealing again. This time he says there is a glaze on them that will not come off with emery paper and he wants $300 to resurface them. I asked him what a glaze was. He admitted he had no idea, but it was there and had to be ground off. Sounds like BS to me; a mysterious glaze forms new brakes that he installed, that requires grinding. But then, I don't know anything about brakes. Any thoughts on the liklihood of this being real? >I have a 2001 Grand Caravan. >Last December I paid the dealer $400 for new rear brakes. [quoted text clipped - 10 lines] >But then, I don't know anything about brakes. Any thoughts on the liklihood >of this being real? Disk brake pads do sometimes develop a glaze which causes squeaking, etc. IIRC, heat can sometimes form a glaze on the surface of ceramic brake pads. In layman's terms, the glaze is like a layer of glass, formed out of the ceramic material in the pad. But $300 to fix this sounds way too high. I have had this done before. All they did was pull the pads out of the caliper and buff the glazed surface with a wire brush wheel on a bench grinder. Perhaps your mechanic also wants to turn the rotors, or perform some other work, as well. Ask if this includes turning the rotors, or what. If you can live with the squeaking, I don't think it will necessarily hurt the brakes to drive on glazed pads. You might also try making several runs in reverse, and then hitting the brakes pretty hard. Sometimes this would quiet my brakes for a few weeks when the pads got squeaky. > >I have a 2001 Grand Caravan. > >Last December I paid the dealer $400 for new rear brakes. [quoted text clipped - 28 lines] > Sometimes this would quiet my brakes for a few weeks when the pads got > squeaky. Actually it was the drums and rotors (they now claim all the brakes are glazed) that are glazed. The pads are fine. Go find a new mechanic, this ones taking you for a ride at your cost. >I have a 2001 Grand Caravan. > Last December I paid the dealer $400 for new rear brakes. [quoted text clipped - 14 lines] > liklihood > of this being real? I agree with Big Poppa Pump. run screaming from this mechanic. you probably only need some anti-squeal spray applied to the pads or some minor adjustment done. If your rotors are smooth and show no signs of roughness then they are probably good. If, when you step on your brakes while moving at a higher than normal speed, and the steering wheel vibrates, your rotors need turning. If the squeal is coming from the rear you probably require new front pads. I know that sounds weird but the front does 80% of the work. If they are down then the rear will do more work than they were designed for and will squeal and glaze over. The front pads always glaze over due to intense heat. go to a mechanic that has a clue and won't rip you off if you can find one. whatever you do - stay away from the franchise places. > Go find a new mechanic, this ones taking you for a ride at your cost. > [quoted text clipped - 16 lines] >> liklihood >> of this being real? depending on what kind of linnings were installed also, if you have a cheap set with a high content of metal in them, they will screak, if the edges arent chamfered, they will screak also, especially in the mornign or wet hummid days Glenn beasley Chrysler Tech > I have a 2001 Grand Caravan. > Last December I paid the dealer $400 for new rear brakes. [quoted text clipped - 10 lines] > But then, I don't know anything about brakes. Any thoughts on the liklihood > of this being real? >depending on what kind of linnings were installed also, if you have a cheap >set with a high content of metal in them, they will screak, if the edges >arent chamfered, they will screak also, especially in the mornign or wet >hummid days >Glenn beasley >Chrysler Tech Also, if it is the rear brakes, a dust accumulation in the drums can and will cause a squeal. In the past, Chrysler brakes have been known to be "squealers" even under the best of conditions. A couple of light cuts across the shoe material, at an angle that leads to the inside of the drum when traveling forward, can help keep the brakes from squealing if dust is the culprit, and chamfering the leading edge of pads and shoes also helps. Now, on Drums (and to a certain extent on rotors) it is POSSIBLE you have what are referred to as "hot spots" or "hard spots" on the surface if the brakes have been severely overheated. These show up as blue spots, often combined with "heat checks" that generally can NOT be turned out effectively. Was a time when the drums would be ground to get them out - but it is usually cheaper, and always more effective, to replace the drums (or rotors) Anti Squeal compounds that go on the friction surface sometimes work - but I've found it to be a temporary solution in most cases. The"rubber" type goop on the back of the pad to keep it from vibrating works very well on SOME cars - particularly if budget pads were installed, meaning the factory type anti-squeal shims and springs are either not there or ineffective. At any rate, the quoted price appears, to me, to be excessive. >> I have a 2001 Grand Caravan. >> Last December I paid the dealer $400 for new rear brakes. [quoted text clipped - 14 lines] >liklihood >> of this being real? I use the "blue" Permatex Disc Brake Quiet (Item# 80077) in a spray can. That stuff is some serious sticky goop after a few minutes in the air. It costs about $5-6 / can. >>depending on what kind of linnings were installed also, if you have a >>cheap [quoted text clipped - 48 lines] >>liklihood >>> of this being real? > I use the "blue" Permatex Disc Brake Quiet (Item# 80077) in a spray can. > That stuff is some serious sticky goop after a few minutes in the air. It [quoted text clipped - 60 lines] >>> >>>>of this being real? start braking sooner or slow down after the problem is fixed .... i like to drive fast and find myself havin to roughen up pads/rotors fairly often (hard fast stops tend to cause glaze) ... just thought id add that since everyone else was just pointing to brake hardware as the problem. dont know if it applies to you or not. late wow, reading what i posted i can see my spelling stinks, lol > depending on what kind of linnings were installed also, if you have a cheap > set with a high content of metal in them, they will screak, if the edges [quoted text clipped - 20 lines] > liklihood > > of this being real? |
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