Disc brakesFailures during the test

Peter Nilges

 · 09.12.2010

Disc brakes: failures during the testPhoto: Wolfgang Watzke
Disc brakes: failures during the test
Those who brake later are faster for longer, as the saying goes in motorsport. Nine new disc brakes show in the laboratory and in practice whether this motto can also be transferred to the bike with a good feeling.

Professional racer Karl Platt is not the only one who can tell you how important a functioning disc brake is in everyday biking life. Platt still remembers the sixth stage of the Craft BIKE-Transalp from Meran to Kaltern in 2004 very clearly. On the last steep descent down to Bolzano, his right index finger unexpectedly came to nothing. The brake was gone, the rear brake pipe was burnt. In addition to horribly dilated pupils and one more unforgettable experience, Platt got out of the misery without crashing. A miracle, given the average gradient of almost 20 per cent on this route. With a slim weight of less than 70 kilos and skilful handling of the brakes, he was by no means the only one with problems of this kind on the stage.

  BIKE test rider Tibor Simai at work.Photo: Wolfgang Watzke BIKE test rider Tibor Simai at work.

Reason enough for us to use this challenging section from Jenesien down to Bozen with a difference in altitude of 700 metres as a test route for the third time. In our luggage: nine new disc brake models, each in two disc sizes between 229 and 309 euros.

In the tough test conditions, we often expect the brakes to fail, because we simulate extreme situations that are not common in everyday biking life but can still occur.

  Discs in danger during the big disc brake test at the end of 2010.Photo: Daniel Simon Discs in danger during the big disc brake test at the end of 2010.

Even our experienced editors and engineers were surprised that this time it was the top dog Shimano with its Ice-Tec disc technology. After all, Shimano is usually a guarantee for mature and stable products.

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  Defect - The aluminium core of a Shimano Ice-Tec disc leaks out of the disc if the disc temperature is too high.Photo: Daniel Simon Defect - The aluminium core of a Shimano Ice-Tec disc leaks out of the disc if the disc temperature is too high.

What exactly happened? Editor Peter Nilges gets to the bottom of the brake failure in our new video.


You can find the test results of these disc brakes in the PDF download below:

Avid Code

Avid X.O.

Formula The One FCS

Hope Tech V2

KCNC DB X7

Magura Marta FR

Shimano XTR XC

Shimano XTR Trail

Trickstuff Cleg 2

Downloads:

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