BENDIX TCH-003-025 User Manual

Technical Bulletin

Bulletin No.: PRO-03-25 Effective Date: 4/15/84 Page: 1 of 2

Subject: E-10 Brake Valve #101270 Modification Kit #265073

It has come to our attention that the remote mounted E-10 Brake Valve assembly
101270 as installed on M.C.I. and T.M.C. coaches is more susceptible to contamination
and internal corrosion due to one or more of the following;

1. Plunger boot deterioration and wear caused by over lubrication of the
actuator mechanism.

2. Insufficient sealing between the plunger, boot and mounting plate as well as
between the mounting plate and valve body.

3. Contamination entering the brake valve (primarily water and road salt) due to
the pumping action of the plunger and boot during application and release.

A number of changes have been made to assembly 101270 to improve its resistance to
contamination and internal corrosion on the M.C.I. and T.M.C. installation. (Reference
Figure 1)

1. A stainless steel fulcrum pin replaces the standard pin. Factory lubrication of
the bell crank and mounting bracket assembly permits the removal of the bell
crank grease fitting and eliminates the need for periodic lubrication.

2. A bellows type boot replaces the standard E-10 boot. The bellows boot
reduces chaffing and provides improved sealing between the plunger and
mounting plate. The addition of a gasket (245570) between the valve body
and mounting plate further improves overall valve sealing.

3. A special non-metallic internally vented plunger and a modified primary piston
stem permits venting of the boot cavity into the brake valve exhaust. The
piston and boot cavities are maintained at or very near atmospheric pressure
eliminating the pumping action.

All 101270 brake valve assemblies built after December 21, 1983 incorporate these
changes. The bellows style boot provides visual identification of current 101270 E-10
Brake Valve assemblies.

Existing 101270 assemblies can be changed to current revision using modification kit

265073. When installing modification kit 265073, we strongly recommend that
maintenance kit 102100 also be installed.

The basic service replacement valve for E-10 Brake Valve assembly 101270 is now
104166 instead of 101100. The modified primary piston stem is used in 104166.
(Reference catalog pages 03-J-1 & 2.) The existing maintenance kit (102100) will
service basic valve 104166. When servicing or replacing basic valve 104166, gasket
245570 MUST be purchased separately.