Four-wheel dual-circuit hydraulic drum brakes, with either vacuum or air pressure servo assist; with a handbrake/parking brake acting on the brake shoes of the rear wheels only, by a mechanical system.
making notes as I go: Residual valve pressure: 5 to 8 psi Brake pedal free movement: 0.25 in (6.35mm) Bell crank lever adjustment: Centre of the lever ball should be 2-7/32 (56.5mm) to the rear of the centre-line of the fulcrum pin.| Brake Drum Diameter | 16 in. (406.4mm) |
|---|---|
| Maximum Brake Drum Diameter | 16-1/16 in. (408mm) |
| Maximum Friction Surface Runout | .010 in. (.25mm) |
| Front Wheel Brake Cylinder Bore | 1-3/4in. (44.45mm) |
| Rear Wheel Brake Cylinder Bore | 1-9/16in. (39.69mm) |
| Main Cylinder Bore | 1-1/2in. (38.10mm) |
| Brake Facing Material Chassis Nos. R.1001 to R.25902 |
Raybestos C.P.5 |
| Front Brake Shoe Width | 3-3/16 in. (81mm) |
| Rear Brake Shoe Width | 4-1/4in. (108mm) |
| Leading Shoe Thickness | 7/16 in. (11.1mm) |
| Trailing Shoe Thickness | 7/32 in. (5.6mm) |
| Facing Length (at outer radius) | 16.79in (426.5mm) |
| Total Brake Lining Area | 498.5sq. in. (3216 cm2) |
| Front Brake Shoe Return Spring Rate | 70lb (31.75kg) at 10in. (254mm) |
| Rear Brake Shoe Return Spring Rate | 35lb (15.88kg) at 10in. (254mm) |
| Bisector Expander Pull Rod Rate | 176lb (79.83kg) at 3/4in. (19mm) |
| Bisector Expander Return Spring | 18 to 22lb (8.16 to 9.98kg) at 1-1/8 in. (28.56mm) |
| Handbrake Pawl Spring | 22lb (9.98kg) at 6-3/4in. (171.5mm) |
| -15C and above | Oil OF-24. Superseded by OX-8/H-542 (DOT-4) |
|---|---|
| -15C to -40 | Oil OF-3. Superseded by OX-8/H-542 (DOT-4) |
See D/DGEME/123/13/3 for confirmation of substitution of OX-8 for OF-24. (Yes, I know that's the servicing schedule for a Daimler Ferret. Same fluid.)
| Brake pedal Linkage, bell crank lever fulcrum pins & bushes |
Oil OC-600 |
|---|---|
| Rear Brake Cylinder Pull-Rod Link Brake Bisector Assembly |
Grease LG-280 |
| Brake Shoe Guide Plates Link Anchor Pins |
Grease LG-190 |