Zimmerman Discs with Porterfields Pads = Squealing?
 

I switched to new Porterfield R4S pads when the stock ones worn out. Had stock discs on then. Everything was well.

I then replaced my discs with Zimmerman's when the stock wear limit was reached. The pads started squealing :( The strange thing is they squeal when they get warm. The 1st few stops are fine but once it gets up nice and warm, it's starts.

Does anyone has similar experiences with Zimmerman Rotors and Porterfield R4S pads? My rears are fine as the stock rotors are still well within the wear limit.

I'm thinking of getting new stock rotors and really hope that'll solve the problem.

Hi,

Before rushing out to buy new rotors, try removing the pads and with a file Chamfer the edges of the Pad Material 45°, that will usually reduce/eliminate squealing. The Pads were probably Chamfered from the Factory to begin with, but have worn smooth, re-establishing the Chamfer will probably do the trick. Hope this helps...

Happy Motoring!... Jim'99

Thanks. I'll try this out. Do you mean filling the entire pad edges all round to 45 degrees? I notice the 2 top edges are already 45 degrees...

Hi,

Yes, I suspect that the leading and trailing edges were once 45° as well but have worn smooth.

A squeal is just an audible vibration and the pads will vibrate when coming into contact with the Disc, but only at the edges. By Chamfering the egdes, you pull the contact point closer to the center of the Pad where the Steel Backing plate is stronger and less prone to vibrate. Hope this helps...

Happy Motoring!... Jim'99

It works!
 

Thanks Jim. My mechanic did it for me yesterday and the squeaking is gone :)