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Old 03-26-2019, 10:28 PM   #1
fanatichuman
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Semi loaded caliper. Is this the piston directly pressing on the pad?

Hi all,

I have to confess (again) I'm a total brake noob. I got the semi loaded calipers for my brake job on the WE.

Is this caliper (see pic) ready? Is the round thing sticking out a bit the piston that comes out? It's hollow. That means the brake fluid is only in a smaller space behind that hollow piston, and the whole thing is sealed by the black seal that's around? And that piston/round opening is pressing against the pad?
Trying to figure out if I'm missing sth. Thanks.


Cheers,
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Old 03-26-2019, 10:41 PM   #2
jfoj
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Looks good to go. You should have some brake pad hardware/clips that often have a sheet metal spring loaded part that may go inside the piston. Cannot recall what hardware, if any, is required for the rear pad. The hardware is to keep the pads from rattling around and help stabilize the brake pads.

The pistons are cup shaped, so they almost all are hollow in the center where they contact the inner brake pad.
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Old 03-26-2019, 11:07 PM   #3
fanatichuman
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Thanks! The clip you mean can be seen in the lower part of the first pic, correct? That's the only part that came with the caliper.

Say, after I bled the breaks, what else do I have to do? (With new pads). Break in the pads? I think the akebonos say it's not needed. Any thing else before I can DD?

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Old 03-26-2019, 11:28 PM   #4
jfoj
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The clip in the first pic is for the outer pad. I cannot recall if the inner pad has a clip, some do, some don't.

Suggest you see what is on the car, search RealOEM.com and ECSTuning.

If you allow the master cylinder to go dry, often you may need to bleed the master cylinder, which can be done while on the car. Often ever after bleeding the brakes. I had a situation like this lately where there was till air in the master cylinder between the 2 pistons after bleeding the entire system. Pedal had too long of a stroke. Just had someone pump up the pedal, hold and crack the brake lines at the master cylinder and removed the last part of the air and the pedal travel was reduced and where expected.

Good luck, if you get it all right, your brakes should be in good shape and have a good feel.

Make sure you do not leave any bolts loose, torque the wheel lugs.
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Temp Info - https://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - https://forum.e46fanatics.com/showthread.php?t=239619

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Old 03-27-2019, 12:04 AM   #5
fanatichuman
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1) No brackets on inner pads
2) I'm using a motive auto bleeder, so not anticipating to run the reservoir low. Why would I dry out the master cylinder?

Thanks!

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Last edited by fanatichuman; 03-27-2019 at 02:03 AM.
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Old 03-27-2019, 06:19 PM   #6
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Quote:
Originally Posted by fanatichuman View Post
1) No brackets on inner pads
2) I'm using a motive auto bleeder, so not anticipating to run the reservoir low. Why would I dry out the master cylinder?

Thanks!

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If you don't have enough fluid in the pressure bleeder you could conceivably empty the bleeder and start pumping air into the master. I did brakes on two cars this summer and both had clips on the inner pads that fit into the piston. My xi and an old Chrysler, front and rear.

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Old 03-27-2019, 06:44 PM   #7
jfoj
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Quote:
Originally Posted by fanatichuman View Post
1) No brackets on inner pads
2) I'm using a motive auto bleeder, so not anticipating to run the reservoir low. Why would I dry out the master cylinder?

Thanks!
Some pads have inner pad clips riveted to the pad backing, some pads have snap on clips.

See the pictures of these Hawk brake pads - https://www.ecstuning.com/b-hawk-par.../hb227f.630kt/

If you are replacing the calipers, depending on how long you have them disconnected, you could possibly allow the master cylinder to drain.

In find with pressure bleeders, it is better to just fill the master cylinder and allow the bleeder to provide compressed air.

You still may need to perform the old school 2 man pedal pump and bleed to get the proper pedal feel.
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Fuel pump failures - https://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - https://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - https://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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