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BENDIX TCH-003-027 User's Manual

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1. Technical Bulletin Bulletin No TCH 003 027 Effective Date 10 17 2011 Cancels PRO 03 27 A dated 4 15 87 Page 1 of 1 Subject BENDIX SV 4 SYNCHRO VALVE amp VENTED CUT OUT COCK PURPOSE AND FUNCTION This bulletin outlines the purpose and function of the Bendix SV 4 synchro valve piece number 109149 in converter dolly air systems and the vented cut out cocks in towing trailer brake systems Synchronizing Valve While the synchronizing valve is not required by any regulations Bendix Commercial Vehicle Systems LLC Bendix has traditionally recommended its use on the converter dolly for the following functions e To prevent an automatic application of towing trailer and dolly emergency brakes in the event a breakaway occurs between the dolly and towed trailer In this instance the Bendix SV 4 synchro valve acts as a shut off valve e Vent air pressure from false charging Service air parking brake release via anti compounding on the second trailer in the event the supply line cut out cock on the towing trailer is mistakenly closed e Assure sufficient service air pressure for braking is present in the dolly reservoir before permitting supply air to enter the second trailer e Enable faster park and emergency brake applications by locally exhausting air In this instance the Bendix SV 4 synchro valve acts as a quick release valve e The SV 4 synchro valve only protects towed vehicles from pressure loss when the fo
2. rward systems leak air TABS 6 Module DC 4 Air disc and drum brakes shown on the same axle for pictorial purposes only Vented Cut out Cock In addition to the synchronizing valve on the dolly Bendix recommends the use of cut out cocks with a vented delivery on towing trailers Vented cut out cocks such as Bendix part number 106118 are also key to preventing false charging situations These situations may lead to brake drag when dollies without an SV 4 valve installed or Bendix PP 1 dolly valves are operated after it is connected 2011 Bendix Commercial Vehicle Systems LLC a member of the Knorr Bremse Group 10 2011 All Rights Reserved

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