Ford Corsar Repair Manual page 603

ASSEMBLY
15. After low and reverse brake has been completely assembled,
measure clearance between snap ring and retainer plate. If
measurement exceeds specifications, it can be adjusted by
replacing retainer plate with one of a different thickness.
Low and reverse brake clearance:
Standard
1.2
-
1.6
mm
(0.047
-
0.063
in)
Allowable limit
3 . 0 mm (0.118
in)
Retaining plate of low & reverse brake
Check low & reverse brake operation using air.
Thickness m m (in)
2.0 (0.079)
3.4 (0.134)
3.6 (0.142)
3.8 (0.150)
4.0 (0.157)
4.2 (0.165)
4.4 (0.173)
4.6 (0.181)
4.8 (0.189)
5.0 (0.197)
Part number
31 666-23x00
31 667-23x00
31 667-23x0 1
31 667-23x02
31 667-23x03
31 667-23x04
31 667-23x05
3 1667-23x06
31 667-23x07
31 667-23x08