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Frequently Asked
Questions
Q)
What is causing one "STAGE" to stay on?
A) If
there isn't a 12 Volt + signal on the input side (left side) of the
Relay Box, then the Relay Box is faulty. For addtional help view our  Troubleshooting Guide.
You may also view our video training series
for instruction on how to
test and troubleshoot the Telma system.
Q)
What is the Air Gap supposed to be on a retarder?
A) The
proper air gap depends on the model of the retarder. The Air
Gap
is the distance between the moving rotor and the pole shoes (steel
pads) on a retarder. To find the identification of your
retarder
visit Identify
My Retarder. For
example, a Focal FN72-40 model is between .055-.061 thousandths of a
inch and
.041-.047 for a AXIAL (AC82-45, AD72-45) series. See the AC
/ AD
/ FN
Spare Parts Catalogs for all retarders.
Q)
How can I identify the
type and serial number of my retarder?
A)
Telma has two Types of retarders, the AXIAL (mounted to the chassis of
the vehicle, Models AD, AC, CC) and FOCAL (mounted to the rear axle,
Models FN, FV, FP). The Telma part numbers and serial numbers are
etched on the stator frame of the retarder itself. It will appear on
the bottom for a AC or CC series and top for the AD and FN series.
Click to Identify
My Retarder.
Q)
Why doesn't the Telma
work since the ABS light has come on?
A)
The Telma is designed to not allow operation whenever a ABS Event is
sensed. This is now a customer option, new installations do not include
this feature, if you have an install with this option enabled, you may
disable it by following the TIL05069 ABS Warning Light
Elimination TSB.
Q)
Why can't I find the
grease tube on the TELMA?
A) All
the newer TELMA brakes since 1998 have a greaseless permanently sealed
bearing construction.
Q)
What is the white, black or grey box on the frame
rail?
A) This
is referred to by many as the "contactor box", "control box", or
"control module". We reffer to it as the Relay Box, or BAC / BEP. The
White box is the BAC - Part # JD331121 ( BAC Spare Part Catalog),
and the black electronic
box is the BEP - Part # JE341121 (discontinued:
BEP
Availability). The grey box is a
Control Box, which includes
the same relay panel in the JD331121, with pressure switches
inside one grey box.
TID11009 Telma Control Box.
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