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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Nov-12-2018, 09:01:54 PM   #1
legacyej25
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Default Should rebuilding brake calipers be a maintenance item?

Thinking ahead to the winter maintenance for my m3: should I rebuild the calipers? I'm planning on doing pads (needed) and most likely rotors.

The calipers feel fine and the car brakes in a straight line. Any thoughts? Or is this a worthless activity.
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Old Mon, Nov-12-2018, 09:10:19 PM   #2
terraphantm
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Default Re: Should rebuilding brake calipers be a maintenance item?

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Originally Posted by legacyej25 View Post
Thinking ahead to the winter maintenance for my m3: should I rebuild the calipers? I'm planning on doing pads (needed) and most likely rotors.

The calipers feel fine and the car brakes in a straight line. Any thoughts? Or is this a worthless activity.
My experience tells me don't rebuild the calipers unless they're actually sticking. You may well cause them to stick if you rebuild them unnecessarily.
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Old Mon, Nov-12-2018, 09:37:21 PM   #3
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Default Re: Should rebuilding brake calipers be a maintenance item?

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Originally Posted by terraphantm View Post
My experience tells me don't rebuild the calipers unless they're actually sticking. You may well cause them to stick if you rebuild them unnecessarily.


Concur. I am rebuilding all 4 corners right now but the calipers are in pretty bad shape. If the dust boots are intact and the pistons move freely no reason to rebuild.


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Old Mon, Nov-12-2018, 10:53:27 PM   #4
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Default Re: Should rebuilding brake calipers be a maintenance item?

No need if the pistons are moving freely, a nice trick is to use titanium shims to avoid frequent caliper rebuilds.

The titanium shields keeps the heat on the brake pads and rotors which is rated for heat. These shims serves as a thermal barrier to the pistons which the seals are in contact with as well as the brake fluid.
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Old Mon, Nov-12-2018, 11:12:11 PM   #5
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Default Re: Should rebuilding brake calipers be a maintenance item?

I bought my car in 2012. Have never had issues with brakes but decided to replace seals and boots this week. I have 4 pot BBK in front and OEM tears. It wasn’t very difficult. I’d look at your boots and if in tact, don’t worry.


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Old Tue, Nov-13-2018, 12:43:26 AM   #6
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Default Re: Should rebuilding brake calipers be a maintenance item?

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Originally Posted by tr4ck_m3 View Post
No need if the pistons are moving freely, a nice trick is to use titanium shims to avoid frequent caliper rebuilds.

The titanium shields keeps the heat on the brake pads and rotors which is rated for heat. These shims serves as a thermal barrier to the pistons which the seals are in contact with as well as the brake fluid.
I bought a set of these shims for my Brembo GT fronts. I did not realize that they would protect my piston seals. But the seals do indeed seem perfect after 10 years. I just did a pad and rotor job, so I was able to inspect everything.
The pistons move with just finger pressure. I never needed the mechanical spreader I bought.

Now, I am glad I bought the shims shortly after I got the BBK.
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Old Tue, Nov-13-2018, 02:04:57 AM   #7
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Default Re: Should rebuilding brake calipers be a maintenance item?

Shouldn’t be an issue unless they’ve seen excessive heat. Signs would be brake fluid boiling or crispy dust boots.

Or if some ape used a screw driver to compress the piston to replace the pads.


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Old Tue, Nov-13-2018, 02:08:08 AM   #8
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Default Re: Should rebuilding brake calipers be a maintenance item?

Seven posts and nobody mentioned to flush the brake fluid? You guys are slacking.
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Old Tue, Nov-13-2018, 02:19:19 AM   #9
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Default Re: Should rebuilding brake calipers be a maintenance item?

Excessive heat and disuse are the two things that seem to push calipers into needing rebuilds.
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Old Tue, Nov-13-2018, 02:29:18 AM   #10
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Default Re: Should rebuilding brake calipers be a maintenance item?

Quote:
Originally Posted by bosundave View Post
I bought a set of these shims for my Brembo GT fronts. I did not realize that they would protect my piston seals. But the seals do indeed seem perfect after 10 years. I just did a pad and rotor job, so I was able to inspect everything.
The pistons move with just finger pressure. I never needed the mechanical spreader I bought.

Now, I am glad I bought the shims shortly after I got the BBK.
Where did you get your shims for your Brembo GTs?
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Discussing Should rebuilding brake calipers be a maintenance item? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)