position of rear caliper piston

[the_brandon]

I recently did an all wheel brake job and a month later I was just looking through some forums and read that the rear piston has to be positioned a certain way.

I did not know this. What's the purpose of this? Should I be concerned?

Another thing is I'm getting an oscillating sound coming from the rear when I apply the brakes, it's not loud or bad sounding its just annoying. It started after I had to slam the brakes in rush hour traffic. What's this sound from?

Edited February 15, 2013 by the_brandon

[RobertISaar]

warped rotor or pad deposition making it feel like a warped rotor.

 

EDIT: your torque the wheels in the correct pattern/amount? this can have an effect on brake feel.

[ron350]

Picture on right shows the position the two slots have to be in.

If you did not have the slots in this position it will cause the symptoms you are having.

 

[intern8tion9l]

I've never set a brake piston in any way?

[Schurkey]

I recently did an all wheel brake job and a month later I was just looking through some forums and read that the rear piston has to be positioned a certain way.

I did not know this. What's the purpose of this? Should I be concerned?

Another thing is I'm getting an oscillating sound coming from the rear when I apply the brakes, it's not loud or bad sounding its just annoying. It started after I had to slam the brakes in rush hour traffic. What's this sound from?

W H A T

 

V E H I C L E ???

 

 

 

Early W-bodies won't adjust the rear caliper pistons to compensate for wear unless you use the park brake now and then.

 

I don't know about '94-up rear calipers.

[the_brandon]

04 comp G,

[White93z34]

You are fine. Its only cars with Actuator-style calipers that you have to worry about that on. First gen W cars have that 88-96(and whatever MC/Luminas that had rear disc through 01) Your 04 has standard calipers on the back.

[the_brandon]

04 comp G

[the_brandon]

Thank goodness I didn't want to tear them apart to seat them properly. I was thinking, when I read about positioning the piston, why do I need to put the slots on the piston like that when the back of the pads are smooth.