Brake rotors unsusal wear, metal falling off!!!!
Brake rotors unsusal wear, metal falling off!!!!
(OP)
I have different brake rotors from 2 vehicles that show strange wear only on the insidie of the rotor. 2006 nissan sentra 54,000 miles original brakes and rotors, 1996 saturn aftermarket rotors with 2 year guarantee, they ran for 4 years and no trouble then got noisy and this is what they looked like, inside only. outside was normal. even the inside pads looked normal but look at the rotor surface, did metal fall off and leave something else exposed?????
Caliper slides were checked and were free moving, pistons were free, calipers bleed several times, brakes feel normal but make noise. It looks like the inside pads were not even touching rotor but they would clamp had and after cleanup of rotor thy looked like this again in several weeks.
Are these rotors compound metal or plated?????
next 2 posts show detailed pictures
Caliper slides were checked and were free moving, pistons were free, calipers bleed several times, brakes feel normal but make noise. It looks like the inside pads were not even touching rotor but they would clamp had and after cleanup of rotor thy looked like this again in several weeks.
Are these rotors compound metal or plated?????
next 2 posts show detailed pictures





RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
again, brakes felt normal and cars were used almost every day.
In 35 years I have never seen this happen before unless there was a mechanical problem, stuck slides or pistons, NO SO in these cases!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
see closeup picture?????
RE: Brake rotors unsusal wear, metal falling off!!!!
How were these vehicles stored? Maybe they both were flooded up to the axles for extended period, which froze the calipers. When the brakes were applied, only the outside pad moved (is the piston on the outside?) while the claiper stayed? After repeated braking applications, the calipers finally broke free, making the noise and making the rust flake off? Best guess from the limited information.
rp
RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
I was not able to correct the situation even after resurfacing pads and sanding rotors with 40 grit paper. The transfer continued and happened within a few weeks again. Why did they last 4 years before doing this, are the pads to blame??? Perhaps the compound changes brakepad material as it gets near the metal backingplate.???
We have never seen this in other brakes over the years.
RE: Brake rotors unsusal wear, metal falling off!!!!
Brakes that are operating properly will have a shiny metal surface on both sides of the rotor after use.
RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
RE: Brake rotors unsusal wear, metal falling off!!!!
Have you noticed any increase in stopping distances recently?
You may get some braking action, but it isn't optimal since you are only getting a rubbing action on one side of the rotor. The wheels would never lock up as you can't get enough friction without the clamping action of both pads against the rotor between them.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: Brake rotors unsusal wear, metal falling off!!!!
I have 35 years automotive experience and these pistons, slides and hardware are working OK. Both cars showed same type of inside rotor transfer. I drove both cars and brakes seemed normal, I go down a very steep mile long hill and the braking effort and stopping power did not seem to be effected. I can not explain the inside rotor surface not being polished but the car would lock up the front brakes without pulling. Whatever is happening is still allowing the brakes to do their job but the inside rotors show this awful surface. So far, transfer from material on the inside brakepad to the rotor surface seems to be the explaination. Perhaps the pad material is different as it comes close to the metal backing plate. Hi iron content transfered to the rotor under heat and pressure may be causing this type of rotor surface problem??????
RE: Brake rotors unsusal wear, metal falling off!!!!
I don't think it's a materials problem, and occurrence on two different vehicles rules out a brake design deficiency. Check the operation of the assembled unit with prussian blue on the inboard surface. It's a long shot, but could the wheel nuts be over torked, and cause just enough warpage to bind things?