How to check wear on PCCB's

[adamr_ZA]

Hey all ... can anyone tell me how can i check for wear on PCCB's? .....

someone mentioned weighing them (aint in the mood to take my wheels out and the rotors to weigh them :)) ...

The Rear Passenger

The Rear Drivers

The Front Drivers

The Front Passenger

Edited August 4, 2009 by adamr_ZA

[Loren]

"General information on replacing worn PCCB brake discs

Three criteria governing the condition of the parts can make replacement necessary depending on the wear of PCCB brake discs:

1. Surface changes in the brake disc friction surfaces (material fatigue/wear) at an advanced stage (indication of wear: associated friction surface damage > 1 cm2).

2. Surface roughness of the brake disc friction surfaces too great (roughness depends on mileage and load).

3. Brake disc minimum thickness is not attained due to wear (material erosion due to friction).

- In practice, all three forms of brake disc erosion usually occur.

- Only in rare cases (in the case of long-term race driving brake loads/very high temperatures on the friction surfaces) does the surface change so quickly that a premature brake disc change has to be performed.

- Blue discs on the brake disc chamber and/or strongly colored brake calipers indicate a long-term, sustained high load, on a racing circuit, for example."

[adamr_ZA]

thanks Loren thats useful info :)

... guess the pics ive attached show that they ok ? ... the rotors are pretty smooth to the touch, no breakage ...

[adamr_ZA]

totally NOOB question ... is thickness measured like ...

OR (based on the technical drawing id assume like the pic below, but just making sure)

Edited August 4, 2009 by adamr_ZA

[Loren]

Thickness is measure as in your second picture - outside to outside of the rotor.

[sws1]

Those rotors look brand new. I've seen track guys with 50+ days on their rotors. They get VERY VERY worn.

Look at the bottom pic in the first photo Loren posted. It looks VERY rough. That's what some of the track guys have and the brakes still perform well.