Hmmmmm . . . . a guess ( which is a half-baked thought )
Okay, so I have over 11k miles on my Spyder, and never had the squeaks until the 2nd adjustment to the parking brake. My dealer (is fantastic, and) is taking care of me on this. But, reading this makes me wonder if my issue is the same as above, or different? They are replacing pads and rotors for me, complete new brake job. Any thoughts?
Here is a guess, according to the Owner's Manual, under the Spyder Periodic Maintenance Schedule, they probably Inspected, Cleaned, and Adjusted your Parking Brake. As I understand this, there is not any adjustment of the brake pads, just the inspection and lubrication of mechanical linkages of the parking brake. But, if one of the adjustments included the Master Cylinder Rod, it may have affected how close the brake pad is to the disc, but more likely that the amount of pressure on the pedal to brake, has changed and your brakes may not be exerting the same pressure as they used to. ( according to the Maintenance Manual, the gap between the pad and the disk is not adjustable - but I am pretty sure the pressure the pad presses the disc is. )
As brake dust, road dirt and moisture come together, they can collect or "cake" on the brake pad and disc. This build-up is the most likely cause of the squeak/squeal when you apply the brakes. The distance between the brake pad and the disc is what allows the dust to cake up - more distance means more cake and when you apply the brakes, that cake ( will in effect ) lubricate the contact of the pad and the disc. You will have brakes, but the slippage and compression of the cake will cause the disc to vibrate and resonate - squeak. You can get the same effect when you rub your finger across the rim of a "squeaky clean" plate. Also, if the brake pad surface is uneven, the low spots will collect that dust cake until the pad is evenly worn.
New brake pads will have a coating on them to protect the 'real' brake pad material. This material will wear off quickly and sometimes unevenly, cake up and make new brakes squeak. The manuals say
it takes 186 miles to wear in brakes - with frequent braking. If they are new or old, if the brake pad surface is uneven, the low spots will collect that dust cake until the pad is evenly worn.
I think that going backward and forward with the brakes on, as I mentioned above, breaks up the cake on the pad and allows for a firm contact with the disc. Going 60+ and screeching to a stop, probably does the same, though I think you lose some life off your tires.
Despite everything I have wrote, please note I am
NOT a brake expert or your service tech. I would bet that if you cleaned your rear brake pads and disc and removed whatever dirt/dust cake was on them, your brakes would not squeak. I would also think that the squeak would come back until the pad surfaces wore in.
So, that is my guess. Hope this helps or gives you some ideas. It also sounds like your dealer will get it fixed.
Tom