MAHLE RTI BRC440 - Manual (Page 3)

Page 1
1 Introduction
Thank you for your purchase of a Lathe and Hub Arm Assembly. Congratulations on your
choice! The BRC Lathe and Hub Arm Assembly is designed to outperform every other
comparable hub mounted brake lathe in all respects.
The BRC was designed as a completely new product. The special hub adaption method
designed by RTI for the BRC is brand new and substantially improved.
The BRC is designed to be easy to use. Once the unit is mounted to the hub it operates in
much the same way as a typical bench mounted lathe. Mounting the unit on the hub of the
vehicle requires the axis of the BRC drive be aligned or compensated to the hub axis of the
vehicle. The precision of this alignment or compensation for the BRC or any other hub mounted
lathe will determine the rotor run out that is finally achieved.
The time to achieve the necessary compensation or alignment of the BRC is minimal. Less
than two minutes per wheel to get around 0.002 in. (0.050 mm) of run out and only slightly more
time to achieve “near zero” or less an 0.001 in. (0.025 mm) of run out. The BRC hub plate is
attached to the hub of the vehicle by means of 3, 4, 5 or 7 special cranks and the
compensation is achieved by simply lengthening or shortening the length of these cranks using
a dial indicator to determine the correct setting. Minimizing brake rotor run out is an important
aspect of modern brake service. Elimination of pedal pulsation issues on wheels with pre-
loaded wheel bearings requires less than 0.001 in. (0.025 mm) of run out. If the wheels do not
run on pre-loaded wheel bearings, run out of 0.002 in. (0.050 mm) is acceptable.
Running the BRC is simple. It has two spindle speeds and a variable feed rate.
The BRC can be used as a “single pass-one cut” machine. However, RTI recommends a “two
pass” machining process with a rough “foundation” cut just deep enough to clean up the rotor
and an extra fine finish cut, with a depth of only 0.001 to 0.002 in. (0.025 to 0.05 mm) per side,
taking full advantage of the special cutting tool design of the BRC This two pass technique will
not remove any more material than necessary, and even though it may take a few minutes
longer, it will result in a more perfect rotor in every respect.
Technical Support
800-468-2321 (Extension 259)