Changing The Lever Ratio - MAGURA HC3 Gebrauchsanleitung

Changing the Lever Ratio

WARnInG!
Ensure that the piston diameter employed is suitable for the requirements on your
motorcycle – this will generally be considered to be a piston diameter the same or slightly
larger than the original equipment master cylinder. Large changes in hydraulic ratio
may lead to poor braking performance or lack of feel. In extreme cases this may lead to
an accident. Due to the improved feel from the patented Hard Core Braking Technology it
is normally prudent to choose a piston diameter 1 to 2mm above the original equipment.
This product has been designed to use Brake fluid DoT 4 or DoT 5.1.
WARnInG!
Clutch applications for 12 (±1) mm HC³ may be suitable for Mineral oil application –
please refer to the reservoir cover in this instance. Any master cylinder designed for
use with mineral oil cannot use brake fluid and should only employ MAGURA Blood or
MAGURA Royal Blood oil. If you are unsure which version clutch master cylinder you
have – all – versions for use exclusively with mineral oil are stamped with an "M" to
indicate this. If your cylinder does not have an "M" stamped into exterior of the main
cylinder housing then it is only suitable for use with brake fluid.
Do not attempt to disassemble or modify this master cylinder in any way. Should you require technical
assistance please see Service section on page X.
Ensure that the brake system is fully bled and sealed before any road or track testing. Changes to the
original hydraulic ratio on the motorcycle may result in changes to the brake feel and pressure point.
Please ride carefully until you are familiar with the characteristics of this brake master cylinder. Following
changes to the lever ratio the same situation applies – please take the necessary time to familiarise
yourself with this master cylinder.
To change the lever ratio please remove the locknut below the lever retaining bolt using an 8mm socket.
Then unsecure and remove the lever retaining bolt (Torx T25) with the red indicator disk – when removing
the bolt please hold the lever securely to avoid it falling. By reinserting the retaining bolt in another hole
and carefully working the retaining bolt through the reciprocal hole in the lever actuator you will increase
or decrease the mechanical lever ratio.
IMPoRTAnT – PLEASE noTE: Ensure before re-installing the lever retaining bolt that the piston
push rod is installed in the spherical cap and that the 3 holes in the master housing and lever base
plate are properly aligned. The lever retaining bolt should only be tightened with 0,5 Nm. Now activate
the lever in both directions and ensure that there is no resistance to travel. When the lever is released
it must return to the off position in a steady and positive travel. Only when this has been verified - the
safety lock nut should be installed with 3 Nm. As before the lever travel should again be checked for
any resistance to travel. In the event of resistance the tightening torque of the lever retaining bolt
should be reduced slightly and the procedure repeated.
[English]
CHAnGInG THE LEVER RATIo
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