BENDIX BW1426 User Manual

Clean the exterior of the brake chamber and mark the 

parts in relation to position to each other so that it may be 

assembled in the same way.
NOTE:  If the brake chamber is to be dismantled without 

removing the non-pressure plate from the vehicle, 

slack adjuster should be backed-off.

CLAMP-RING TYPE CHAMBER
1.  Pull out the push rod and clamp it at the non-pressure 

plate. If using vise grip pliers, the push rod should be 

protected so that it will not be damaged.

2.  Remove the clamp ring nuts and bolts.
3.  If the chamber has a single clamp ring, spread the ring 

slightly, just enough to slip it off the plate. Care should 

be taken so that the clamp ring is not distorted. If the 

chamber uses a two-piece clamp ring, remove the 

clamp rings.

4.  Remove the pressure plate and diaphragm.
5.  Remove the yoke lock nut and yoke from the push rod 

and release the grip on the push rod, being careful to 

contain the push plate and non-pressure plate until the 

return spring load is relaxed.

6.  Remove the push rod assembly and spring.
7.  Remove the boot (if applicable).
CLEANING AND INSPECTION
1.  Clean all the metal parts in cleaning solvent, removing 

all rust and scale.  All diaphragm sealing surfaces 

should be smooth and clean.

2.  Carefully inspect all metal parts for cracks, distortion 

or damage.

3.  Replace all rubber parts and all other parts not 

consid ered serviceable with Genuine Bendix

®

 brand 

replacement parts.

CLAMP-RING TYPE CHAMBER
1.  Stand the push rod assembly upright on a flat surface.
2.  Position the return spring on the push rod.
3.  Install the boot or o-ring on the non-pressure plate (if 

applicable).

4.  Position the non-pressure plate on the push rod, and 

press the plate down against the tension of the spring 

until plate bottoms on flat surface. Clamp the rod with 

vise grips (protect the rod) at the plate.

5.  If installing a single clamp ring, position the ring over 

the clamping surface of the non-pressure plate.

6.  Check the alignment marks (made before disassembly) 

and position the diaphragm in the pressure plate and 

place on the non-pressure plate.

7.  If installing a single clamp ring, work the clamp ring over 

the clamping surface of the pressure plate and draw 

the clamp lugs together (with vise grips or a similar 

tool). Install the bolt and nut in the clamp and tighten, 

tapping with a soft-faced mallet (to center the clamp 

ring if necessary).  Release the grip on the push rod 

and install the remaining bolt and nut.

8.  Install the nuts and bolts evenly and only sufficiently to 

eliminate leakage.

Perform the tests outlined in the “Operating and Leakage 

Tests” section.

BW1426 © 2014 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group  •  06/14  •  All Rights Reserved.

On-line training that's available when you are   24/7/365.

Visit www.brake-school.com.