ABS Front Brakes: Procedure Question for Resetting Piston/Turning Rotors

[rainn240]

Vehicle: 2006 Toyota 4runner
Miles: 36,000 miles


Hello,

I've read several posts regarding replacing the front brake pads on my T4R.
Recently, I've felt the "pulsing" when I step on the brakes, and I believe it may be the brake pads wearing down or the rotors are warped.

1st question:

1. When resetting the front brake calipers, have you guys heard of opening the air bleeder valve prior to pressing the piston back into the brake caliper?

This step would allow the brake fluid to escape from the air bleeder valve versus going back into the ABS system which could cause damage. Not sure if this is true. If not, then what's the correct procedure?


2nd Question:

2. Should I turn my brake rotors everytime I change my brake pads? I've read on other posts not to turn the brake rotors on newer T4R's... Not sure if this is true.

Thanks for the input. The Haynes guide did not cover these questions.

Max

 

[rainn240]

Bump

Bump.

 

[JeremyH]

No, do NOT open the bleeder valve when depressing the piston. You may want to open the top on your master cylinder (where you add brake fluid), in case it happens to be too full from fluid being added.

Yes, you should start with a level surface when you install new pads. Whether that is accomplished by turning the rotors or replacing them, does not matter.

 

[CJ3Flyr]

No, do NOT open the bleeder valve when depressing the piston. You may want to open the top on your master cylinder (where you add brake fluid), in case it happens to be too full from fluid being added.

Yes, you should start with a level surface when you install new pads. Whether that is accomplished by turning the rotors or replacing them, does not matter.

:iagree: This will work. The big 'danger', IMHO, opening the bleeder is the possibility of getting air back into the caliper unknowingly. If you are planning to bleed the brakes through as part of the job then it probably doesn't matter.

The only downside to cutting rotors is they will re-warp much sooner than new ones. At only 36k I'd be tempted to just turn them. There's a few threads on new rotor options. It is worth it to buy a premium rotor from Napa, Brembo or somebody rather than the cheapy Autozone special. When I say premium I mean premium quality OE replacement not drilled, slotted Ebay rotors. Toyota rotors are good I guess but I swear the Napa's do better with regard to warping. If the Toyota rotors were "all that" you wouldn't be posting this Again the top grade Napa brand rotors have always been good to me.
:cheers:

 

[JeremyH]

The big 'danger', IMHO, opening the bleeder is the possibility of getting air back into the caliper unknowingly.

Again the top grade Napa brand rotors have always been good to me.

Agreed on both accounts! Napa makes good rotors (and oil filters, FWIW)....