Rear brake noise

[-Ray-]

hmm. bad parts do come out occasionally. very few things are 100% perfect.

IBM the first business to perfect statistical quality control says the best manufacturing can ever do is 99.97%.

[Napalm]

Thought that was motorola and the whole 6 sigma thing. but yes. I'm having flashbacks now.

[-Ray-]

Thought that was motorola and the whole 6 sigma thing. but yes. I'm having flashbacks now.

Lol. I was making x bar charts for parts made for IBM in 1980.

[MIEngineer]

I've been running DBA drilled and slotted rotors for years on the rear of my G8 with no noise at all. I do like to deburr all the pad ears though.

My craptastic 2 pc slotted from DBAs do it. Its a whirring noise.

How do you get a warped rotor? It isn't really "warped" - but ive seen garbage out of the box on aftermarket rotors ive tested before with several issues [casting thickness and machining issues]

[Napalm]

I have seen some get warped by heat cycle - really hot application (like at a race track) and a sudden quench in water (puddle on track). that can be bad news but it's not major by any means.

and I've seen where people over torque the snot out of the lugs which distorts (warps) the hat face. but I mean major disparity in torque. like 500 ft lbs on 2 lugs and 100 on the other 3 or something.

Otherwise I agree most issues are the deposits or other heat checking of the interface surface.

The whirring - I get that also but I have slotted rotors and most of the time with slotted rotors I expect to get some noise.

[MIEngineer]

Yeah heat cycle etc can do it

But I have seen garbage from companies right out of the box with excessive run out etc. Kind of aggrevating when the car is in pieces or you have some data to collect