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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, Mar-28-2015, 12:36:47 PM   #1
humarahumara
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Default Brake hose threads showing after installing new caliper??

Hey all,

Need some help here. Installed rebuilt drivers front caliper on my 95 m3. (Both calipers were replaced last year but drivers front seized on me last week.)When reattaching brake hose everything seems smooth except when it came to tighten down, there were still 2 lines of threads still showing as if the brake hose wasn't tight. It is tight and I don't want to overtightened. Is this normal? Didn't see any leaks when i went to bleed but i'm paranoid now.
what should i do? I'm concerned that stuff/water/crap may start to work into the exposed threads.
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Old Sat, Mar-28-2015, 04:36:53 PM   #2
68coug
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Default Re: Brake hose threads showing after installing new caliper??

Quote:
Originally Posted by humarahumara View Post
Hey all,

Need some help here. Installed rebuilt drivers front caliper on my 95 m3. (Both calipers were replaced last year but drivers front seized on me last week.)When reattaching brake hose everything seems smooth except when it came to tighten down, there were still 2 lines of threads still showing as if the brake hose wasn't tight. It is tight and I don't want to overtightened. Is this normal? Didn't see any leaks when i went to bleed but i'm paranoid now.
what should i do? I'm concerned that stuff/water/crap may start to work into the exposed threads.
I'm assuming you purchased remanufactured calipers rather than rebuilding the originals. The remanufacturers typically blast the outside to remove rust the put a rust prohibitor on (which does not work).
Those 2 processes typically leave the internal threads rough causing the brake hose not to seat all the way. It probably won't leak, don't overtighten.
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Old Sat, Mar-28-2015, 05:18:58 PM   #3
humarahumara
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Default Re: Brake hose threads showing after installing new caliper??

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Originally Posted by 68coug View Post
I'm assuming you purchased remanufactured calipers rather than rebuilding the originals. The remanufacturers typically blast the outside to remove rust the put a rust prohibitor on (which does not work).
Those 2 processes typically leave the internal threads rough causing the brake hose not to seat all the way. It probably won't leak, don't overtighten.
Yes they were remanufactured. I see. Will keep me eye on it. Anyone else have similar experience?
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Old Sat, Mar-28-2015, 11:44:08 PM   #4
Jrrrrrrr
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Default Re: Brake hose threads showing after installing new caliper??

Don't be immediately concerned because the threaded fitting from the brake line to caliper isn't going to come loose if it's torqued properly. I've seen this same issue of the flange on a threaded fitting on the brake lines not making contact with the brake caliper. The brake line can last many thousands of miles, without the flange-head on the fitting contacting the brake caliper, without coming loose. This issue can also because of aftermarket brake hoses, like stainless-steel lines, which don't necessarily have the same length of threaded flange as a real OEM brake line.

The solution is to install a shim (washer) between the brake caliper and brake-line threaded flange to eliminate the possibility of the line rattling loose. About two threads on an M10x1.0 fitting is about two millimeters of thickness, and it's easy to find a washer of that thickness.

This is a parts-defect, though, so replace the brake caliper(s) (or brake lines if applicable) if you are really that concerned about the issue.

Last edited by Jrrrrrrr; Sat, Mar-28-2015 at 11:47:44 PM.
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Old Sun, Mar-29-2015, 02:13:57 AM   #5
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Default Re: Brake hose threads showing after installing new caliper??

Perfectly normal. Carry on.
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Old Mon, Mar-30-2015, 07:01:09 AM   #6
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Default Re: Brake hose threads showing after installing new caliper??

Quote:
Originally Posted by humarahumara View Post
...When reattaching brake hose everything seems smooth except when it came to tighten down, there were still 2 lines of threads still showing as if the brake hose wasn't tight.
Quote:
Originally Posted by jayjaya29 View Post
Perfectly normal. Carry on.
This.

Quote:
Originally Posted by Jrrrrrrr View Post
This is a parts-defect, though, so replace the brake caliper(s) (or brake lines if applicable) if you are really that concerned about the issue.
And not this.
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Old Tue, Mar-31-2015, 02:01:17 AM   #7
Earthwormjlm
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Default Re: Brake hose threads showing after installing new caliper??

Perfectly normal. My OEM brake lines and calipers do this.
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Old Wed, Apr-01-2015, 03:17:32 AM   #8
humarahumara
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Default Re: Brake hose threads showing after installing new caliper??

Much appreciated guys! Checked again this morning. No leaks, everything all good!
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Discussing Brake hose threads showing after installing new caliper?? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)