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#1
06-12-2009, 06:24 PM
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Brake Break-in Period?
Had the front brakes done on the 92 300D. Balo rotors, Pagid pads. On hard braking, does not seem to be as smooth as it should. Pulsating would be too strong a word...but a very mild version of that is how it feels.
My tech tells me to give them 50 miles or so to "settle in." Is that right? Do pad and rotor somehow need to "adjust" to each other in order for braking to be perfectly smooth? Or does it sound like something's wrong. I know rotors can be bad out of the box.... Thanks!
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
06-12-2009, 06:31 PM
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New rotors have a coating on them that should be cleaned off. Sometimes a residue can be left over that can cause glazing and you could end up with squealing brakes for a while. If only the pads are new, it takes a little bit for the pad to conform to the rotor completely.
That being said, I've never experienced a strange vibration in new pads or rotors unless something was wrong. I imagine if you have ceramic pads they could cause a vibration on a grooved rotor though.
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Chad 2013 Jeep Unlimited Rubicon OBK#44 "Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.) SOLD 1985 300TD - Red Dragon 1986 300SDL - Coda 1991 - 300TE 1995 - E320 1985 300CD - Gladys 2006 Nissan Pathfinder LE 1998 Acura 3.0 CL
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#3
06-12-2009, 06:32 PM
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Read this about bed-in procedure....guess this applies.
http://www.tirerack.com/brakes/tech/techpage.jsp?techid=85
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
06-12-2009, 09:36 PM
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I did a lot of brake jobs back when I was wrenching for money, and most of them worked just fine upon assembly. Once in a while, however, it would take a little while for the pads and rotors to wear in to each other and make full contact across the surface of the pads. Give it 50 or a hundred miles of city driving and if it's still not how you like it, take it back for further investigation.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. 99 Mazda Miata 183,xxx miles.
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#5
06-12-2009, 10:05 PM
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The normal pads don't take long to break in, maybe 10 miles and a few good stops. The PBR Ceramics take longer. Mine took about 100 miles of driving to get up to "max" braking power, and now they are awesome.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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