Meritor Heavy-Duty P Series Maintenance Manual page 18

6 Adjustment
4. Measure the push rod travel or adjusted chamber stroke from
where the push rod exits the brake chamber to your mark on
the push rod. Measure and record the distance. Figure 6.4.
5. Subtract the measurement you recorded in Step 3 from the
measurement you recorded in Step 4. The difference is the
push rod travel or adjusted chamber stroke.
6. Refer to Table A or Table B to verify that the stroke length is
correct for the size and type of air chambers on the vehicle.
If push rod travel or adjusted chamber stroke is greater
than the maximum stroke shown in Table A or Table B:
Inspect the slack adjuster and replace it, if necessary.
Table A: Standard Stroke Clamp-Type Brake Chamber Data
Outside Diameter
Type (inches)
6 4-1/2
9 5-1/4
12 5-4/16
16 6-3/8
20 6-25/32
24 7-7/32
30 8-3/32
36 9
Table B: Long Stroke Clamp-Type Brake Chamber Data
Outside Diameter
Type (inches)
16 6-3/8
20 6-25/32
24 7-7/32
24* 7-7/32
30 8-3/32
*For 3" maximum stroke type 24 chambers.
14 Meritor Maintenance Manual MM-0440 (Issued 09-04)
Alternate Method to Measure Push Rod Travel or
Adjusted Chamber Stroke
Use the CVSA procedure, except in Step 3 and Step 4, measure the
distance from the bottom of the air chamber to the center of the
large clevis pin on each of the brakes.
CVSA North American Out-of-Service Criteria
Reference Tables
Information contained in Table A and Table B is for reference only.
Consult the CVSA's Out-of-Service Criteria Handbook for North
American Standards, Appendix A. Visit their website at
http://64.35.82.7/ to obtain the handbook.
Brake
Adjustment Limit
(inches)
1-1/4
1-3/8
1-3/8
1-3/4
1-3/4
1-3/4
2
2-1/4
Brake
Adjustment Limit
(inches)
2.0
2.0
2.0
2.5
2.5