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  #1  
Old 08-20-2009, 05:14 PM
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Stainless brake lines keep exploding?!?!

I have tried 3 different types of stainless brake lines (front and back) on my w201 and ever single set has ruptured during regular driving situations rendering the brakes useless and under pressured. Why does this keep happening? This is getting pretty dangerous if my brakes keep failing. I switched to stainless lines because I was under the impression it made for stiffer braking (which i want). Any ideas why this is happening?

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Old 08-20-2009, 05:54 PM
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wow first time iv heard of this?...who supplied or made your lines?.
My fronts were supplied by stoptech and the rears made locally,all 4 were pressure tested to well beyond what you could actaully apply through the pedal.

Could they be stressed some how,maybe length or route is playing a part?.

Paul
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Old 08-20-2009, 06:13 PM
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Brake lines don't burst unless they are severely rusty or damaged. I'm guessing yours are "exploding" at the fittings? Who made the flares in the end of the lines? Are they proper metric bubble flares made using a quality tool by someone experienced in such things?

I've made dozens of brake lines and never had one fail. I personally made all the lines on my Porsche track car. It's stood up to threshold-braking from 130 mph many hundreds of times with nary a leak. I don't use stainless lines, I use regular coated steel brake lines.

Who made your lines for you?
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Old 08-20-2009, 06:21 PM
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Those bling SS hoses-you are refering to the flexible part or?- give no better brake feel than new stock hoses, and they are much more prone to damage from chafing, which I suspect is your problem, or road debris.
Furthermore, if these lines are not DOT approved, you will be up the creek if a brake failure causes an accident.
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Old 08-21-2009, 06:13 PM
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who make your lines? I've been using SS lines for a few years now on my street and track cars, NP to report!

The lines I use are PTFE lined and have anti wear/friction jackets.

Jonathan
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Old 09-06-2009, 12:41 PM
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This is most unusual, we have mounted dozens of SS/teflon lines with no failures.

However SS/teflon lines do not like to be kinked or twisted. Putting a twist on the line during installation is fairly easy if installation is rushed.......

Tighten the new line into the caliper first, leaving the chassis end free.

Then loosen the chassis side brake line connector from its bracket (the big nut). Then loosen the chassis side hard line from the connector so you can rotate the connector. Both of these loosening actions require two different sized spanners.

Then by rotating the connector, tighten it onto the chassis end of the new line. Give the whole line a good shake to relieve any tension/twist, then without rotating the connector tighten up the chassis hard line and finally the large nut that holds the connector to its bracket.

Regards,
bobf
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Old 09-08-2009, 03:39 PM
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Those bling SS hoses-you are refering to the flexible part or?- give no better brake feel than new stock hoses, and they are much more prone to damage from chafing, which I suspect is your problem, or road debris.
Furthermore, if these lines are not DOT approved, you will be up the creek if a brake failure causes an accident.
08-20-2009 05:13 PM


btw mine from stoptech are dot approved.
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Old 09-08-2009, 05:19 PM
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Quote:
Originally Posted by wis View Post
btw mine from stoptech are dot approved.
Some are approved, some are not. I've made numerous hoses for racing applications only because a stock rubber wasn't suitable. I always wrapped them in plastic spiral wrap to protect them from damage, and I would do the same for a street driven car.
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Old 09-09-2009, 03:13 PM
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The other thing to remember is that the SS lines should be slightly longer (maybe an inch or so) than the regular lines, especially on the front - to help avoid the kinking/binding issues noted above.

(I have tracked Goodrich SS lines in my C230 SS without problems.)
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Old 09-10-2009, 12:16 PM
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Quote:
Originally Posted by RolexBenz190E View Post
I have tried 3 different types of stainless brake lines (front and back) on my w201 and ever single set has ruptured during regular driving situations rendering the brakes useless and under pressured. Why does this keep happening? This is getting pretty dangerous if my brakes keep failing. I switched to stainless lines because I was under the impression it made for stiffer braking (which i want). Any ideas why this is happening?
Are you talking about brake lines, i.e. the hard metal pipes? Or are you talking about brake hoses i.e. the flexible ones that go to each caliper?

Proper terminology is key here. Both the lines and the hoses are available in stainless steel. And neither should ever "explode".

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