BENDIX TCH-002-014 User's Manual
Contents
1. the speci cation or manufacturing process as production ramped up If the open vent hole location is not properly positioned the potential issue referenced above may occur Other scenarios that may lead to this same condition include 1 failure to remove the bottom plug when a service replacement was installed or 2 parts that have been used in unapproved orientations There are no indicators leading to a particular incident manufacturer or application that can point to an isolated segment or population of actuators or vehicles that are incorrect Since 2006 BSFB has made improvements to the caliper sealing interface boot and return spring coating Along with these improvements the actuators were tested comparing those with ve 5 holes plugged and the bottom open to those with six 6 holes open with negligible performance differences This means that as long as the bottom hole closest to the road surface is open the other holes do not need to be plugged Air Disc Brake Actuator Bottom View Shown Open Vent Bottom vent hole must be open Plugged Vent All other vent holes may be open or closed Enlarged View Continued Bulletin No TCH 002 014 Effective Date 2 2 2012 Cancels N A Page 2 of 2 Subject Bendix Air Disc Brake Actuator Vent Hole Orientation Action Vehicles with Bendix brand air disc brake actuators should be inspected to verify that the vent hole closest to the bottom of the actuat2. Technical Bulletin Bulletin No TCH 002 014 Effective Date 2 29 2012 Cancels N A Page 1 of 2 Subject Bendix Air Disc Brake Actuator Vent Hole Orientation Issue It has come to our attention that some Bendix brand air disc brake actuators in service have the bottom vent hole plugged in error This allows moisture and contaminants to enter but not drain causing corrosion and premature failure of the actuator Background When Bendix Spicer Foundation Brake Systems LLC BSFB introduced brake actuators for Bendix brand air disc brake calipers in North America the actuators were manufactured with one vent hole on the perimeter of the non pressure side of the actuator This vent hole was oriented so that with the actuator mounted on a vehicle the hole would point down to the road surface to allow moisture and contaminants to drain In 2006 a change was made to facilitate exibility in manufacturing and servicing Five additional vent holes were placed around the perimeter of the actuator and removable plugs were placed in ve 5 of the six 6 holes leaving one open vent hole A variety of actuator con gurations were made available for OE installations to ensure that the open hole was properly positioned in each installation With the increased demand of air disc brakes came an increase in unique applications and con gurations As such it is believed that at times the vent plug location may have been overlooked in
3. or is open If a plug is found in this location it must be removed to allow proper draining The removed plug can be discarded It is not necessary to place it in the other open port Removal of the plug is easily completed by pulling it out with a pair of needle nose pliers Note that the removal of this plug will not impact the actuator warranty Since testing has shown that having more than one vent open does not impact either performance or the life of the product the plugs are being removed from all Bendix air disc brake actuator designs This will eliminate the possibility of water and contaminants collecting in the actuators reduce part numbers and inventories and make servicing the actuators easier All 6 Vent Holes Open New OE and Aftermarket Air Disc Brake Actuator Design If you have questions regarding this bulletin please call the Bendix Tech Team at 1 800 AIR BRAKE 1 800 247 2725 Representatives are available Monday Friday 8 00a m 6 00p m E T 2012 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 2 2012 All Rights Reserved
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