 | Home > Technical > New breaks squeal at 50 mph, strange groove on disk |
 
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| lohr500 Member Since: 14 Sep 2014 Location: Skipton Posts: 1316   
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Looking at the photo, I would say there is nothing wrong with the disk. The rust you can see looks to be on the area of the disk that isn't in contact with the pads and over time will rust further. The squeal could just be the initial bedding in of the pad to the disk. Even though a new pad and new disk look to have perfectly flat surfaces, there can be minor imperfections. A slight high spot on the pad or the disk results in the pad and disk not making full contact across the whole surface immediately. That can cause the squeal. But after a few uses of the brakes, the pad should bed in fully and work more effectively. If the squeal has now gone away and the brakes feel as though they are working OK, I wouldn't worry.
If the squeal continues take it back and ask the workshop to check that the pads and retaining clips are fitted correctly. Not sure if it is recommended in the workshop manual, but I always apply a thin layer of copper slip type grease on the back of the pads as I was told this helps to stop squealing. |
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7th Jul 2017 8:16pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20347
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^^^^ I have often heard this regarding copper slip also.
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7th Jul 2017 8:52pm |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120 
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Thanks a lot for your advice, folks! i presume it's either the pads being run in, or something vibrating at a resonance frequency, as it always occurs at exact the same speed.
Maybe it's just part of the Defender soundscape  |
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15th Jul 2017 8:47am |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4209 
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I had pad squeal after changing the pads, calipers were partially siezed. It scrapped the new pads as they overheated. I don't know how old or how many miles it has done but could be first sign of seized piston. 2007 110 TDCi Station Wagon XS
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15th Jul 2017 8:57am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Hm, I also just had new calipers fitted... would not be good. They're maybe 3 weeks old, and 2k miles. Was rather pricey altogether.
Is there any way to diagnose stuck calipers? Can you see them move if someone applies the brakes? |
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15th Jul 2017 6:03pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4209
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I would say if the calipers are new it won't be that. I knew mine were marginal because the pistons were corroded and difficult to push back. 2007 110 TDCi Station Wagon XS
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15th Jul 2017 6:17pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4209
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The easiest way to diagnose a stuck caliper is if the wheel turns freely when off the ground. 2007 110 TDCi Station Wagon XS
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15th Jul 2017 6:18pm |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Hmm, there might be a thermal cause, though. Squealing starts usually after half an hour on the motorway...
On a sidenote: yours is a 2007 java black 110? Nice car, got just the same 
P.S.: wheel turning freely, since it should be held by the handbrake? I will jack it up the next few days and see, thanks for the tip... |
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15th Jul 2017 6:20pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4209
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Ive had this with seized calipers on both my defender and the wife's car. Pads are fine when cold, but as the calipers forces them to drag on the disk, they heat up and start making a right racket. Usually happens even at low speed though once it starts squealing. 2007 110 TDCi Station Wagon XS
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15th Jul 2017 6:24pm |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Sounds pretty similar. What confounds me, though - squealing (or rather, chirping) from the brakes only occurs at 50mph. If I step on the brakes, it stops. But if I accelerate, it also vanishes. Rather strange. I'll examine the calipers though by rotating the wheels. Should also see excessive pad wear if that is the reason for the racket...
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15th Jul 2017 6:27pm |
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