Bendix Commercial Vehicle Systems ADB22X-V Air Disc Brakes - Manual (Page 14)

14
Caliper
Movement
1
Caliper
5
Guide Pin
9
Inner Boot
9 Inner Boot
7
Brass Bushing
10
Cap
6 Guide Sleeve
4 Guide Pin
39
Caliper Bolt
Outboard Inboard
68
Cap
SHORT
BEARING SIDE
LONG
BEARING SIDE
FIGURE 26 - GUIDE PINS
12 Pad Assembly
1
Carrier
2
Caliper
Magnetic
Dial-Gauge
Measures
Range Here
FIGURE 27 - MAGNETIC DIAL-GAUGE IN USE
Measure the “play” (range of movement) in the guide
pin bearings:
4.5.2 See Figures 26 and 27. With the wheel removed,
remove the pad retainer bar (11). Temporarily
replace the pads with two new pads (12). Attach
a magnetic dial-gauge holder to the carrier (2) on
the short bearing side of the caliper (1). Use the
measuring point on the caliper (1) - see the callout
MACHINING OF BENDIX ® SPLINED DISC ® ROTORS IS
NOT PERMITTED.
CAUTION: Always maintain air disc brake pads and rotors
within specifi cations. Excessive pad or rotor wear will
degrade braking performance.
Periodic inspection of the Bendix Splined Disc attachment
hardware is recommended to ensure optimum braking
performance. Bendix recommends verifying the torque on
the spring element fasteners whenever a brake inspection
is performed.
WARNING! AFTER MACHINING/TURNING,
THE MINIMUM ROTOR THICKNESS FOR BENDIX ®
BRAND ROTORS MUST BE AT LEAST 1.535 - 1.575 IN.
(39 - 40 MM.) - FOR OTHER BRANDS, CONSULT THE
MANUFACTURER’S GUIDELINES. ALSO, CHECK THE
VEHICLE MANUFACTURER’S RECOMMENDATIONS.
FAILURE TO COMPLY MAY RESULT IN BRAKE FAILURE
AND IN SERIOUS INJURY OR DEATH. MACHINING OF
BENDIX SPLINED DISC ROTORS IS NOT PERMITTED.
4.4.4 Rotor Replacement
An axle is permitted to have only all Bendix Splined
Disc, or all conventional, rotors.
When replacing rotors, be sure to adhere to the vehicle
manufacturer’s recommendations, including bolt tightening
torques. It is recommended to install only Bendix
® brand
rotors, and also that the pads should be replaced (as an
axle set) at the same time.
Non-Bendix ® brand rotors. If a non-Bendix ® brand rotor is
used, confi rm that it complies to the vehicle manufacturer’s
recommendations.
CAUTION: The use of non-approved brake rotors may
reduce levels of safety and invalidate the warranty.
See Section 5.7 for re-installation procedures.
4.5 GUIDE PIN BEARING INSPECTION
CAUTION: Follow all safe maintenance practices.
This guide pin inspection should be carried out if the
technician cannot move the caliper during a Caliper
Movement Test (Sections 2.2 and/or 4.1).
Measure the range of travel along the guide pin
bearings:
4.5.1 Remove the Pads (See Section 4.3). Using hand
pressure only (no tools), the caliper (1) should slide
freely along the whole length of the guide pins. This
movement should be at least 0.95 inch (25 mm)
when the pads are not present. If the movement
is less than this amount, replace the caliper/carrier
assembly.