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PB -PC Challenger 2009 - 2014 Covering 2.5 HP diesel

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Old 11-11-17
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Default Rotor cracks

I serviced the old girl today and noticed these perfectly straight what appear to be cracks in the front rotors. They don,t go all the way through but are on the surface and can be felt. Each of the front rotors has 2 of them. Has anyone else noticed these on their Challenger?
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File Type: jpg 01.jpg (169.7 KB, 68 views)
File Type: jpg 02.jpg (188.0 KB, 74 views)
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Old 11-11-17
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Most radial cracks are not perfectly straight, they tend to be a little wiggly.
You said there are 2 of these marks on each rotor, by chance would they be the length of the brake pad apart?

OJ.
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Old 12-11-17
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OJ is onto it.

I can assure you these are not cracks. Cracks from over heating are usually small hairline wiggly lines in a radial pattern around the face of the rotor or can form around cross drilled holes.

Benny.
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Old 12-11-17
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No they are perfectly straight and about 1/3 of the rotors diameter apart. It's really weird. The rears don't have it only the front. I have a pic of the full rotor but it won't let me load it says file fail to load.
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Old 12-11-17
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Actually they are almost half the rotor diameter apart, just under.
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Old 12-11-17
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Is it possible that the mould is split here when they cast the rotors
This may cause the steel to cool differently to the rest of the rotor causing a soft or hard spot.
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Old 12-11-17
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Dunno... It's puzzling as it is only on the surface from what I can see. Both rotors are identical, small not deep straight what appear to be cracks with small pieces flaking away from the meeting edges. Like they were glued together....
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Old 12-11-17
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On closer inspection I can see what you are talking about, it could be bits of friction material that have deposited on the rotor and then these bits have been dragged backwards.
Is the photo of the right or left rotor?
Have you had any heavy braking episodes recently!
What is the condition of the pads, have they been removed and inspected?

OJ.
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2011 PB Base White Auto, Smartbar, Cooper STMaxx LT245/75/16, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Nightbreaker +130LB & Phillips +100 HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
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Old 12-11-17
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I have similar on L/H Rear rotor
.



Brakes grab make a bit of noise in reverse. . Been measured and calipers checked .. all within specs ..
..
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Old 13-11-17
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I'm fairly sure it's pad material being deposited on the rotor face after the pad has been stationary against the rotor. This line being the centre groove on the face of the pad.The material then continues to collect more material until it is essentially burnt off. I've seen it plenty of times. Not sure if anyone else is able to confirm this though?

Benny.
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Last edited by NTBenny; 13-11-17 at 01:10 PM. Reason: Spelling
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