300Tdi Defender
70
BRAKES
2
REPAIR
BRAKE SYSTEM BLEED
Service repair no - 70.25.02
Preparation
WARNING: Before bleeding the brake
system refer to general brake service
practice.
See General Brake Service
Practice .
During bleed procedure, brake fluid level must
not be allowed to fall below the MIN level.
To bleed the hydraulic circuits, four bleed
nipples are provided, one at each caliper.
There are two methods by which air can be
removed from the braking system:-
1. MANUAL BLEED PROCEDURE.
2. PRESSURE BLEED PROCEDURE.
Pressure bleed procedure
Purpose designed equipment for pressure filling and
bleeding of hydraulic systems may be used on Land
Rover vehicles. The equipment manufacturer’s
instructions must be followed and the pressure must
not exceed 4.5 bar, 65 lb/in
2
.
Manual bleed procedure
Equipment required
¡
Clean glass receptacle
¡
Bleed hose
¡
Wrench
¡
Approx 2 litres (3 pints) brake fluid.
See
LUBRICANTS, FLUIDS AND CAPACITIES,
Information, Recommended lubricants and
fluids
Master cylinder bleed
1. Disconnect battery.
2. Depress brake pedal fully and slowly 5 times.
3. Release the pedal and wait for ten seconds.
4. Air bubbles will rise into the reservoir during
these instructions.
5. Repeat instructions until a firm resistance is felt
at the pedal.
Complete circuit bleed
1. Disconnect battery.
2. Bleed front calipers, driver’s side first. Fit bleed
hose to bleed screw.
3. Dip free end of bleed hose into brake fluid in
bleed bottle.
4. Open bleed screw of caliper.
5. Depress brake pedal fully several times until fluid
is clear of air bubbles.
6. Keeping pedal fully depressed, tighten bleed
screw, then release pedal.
7. Repeat procedure on other front caliper followed
by rear calipers.
8. Fit all bleed screw protection caps.
9. Check/top-up fluid level when bleeding is
complete
See Fluid Level Check/Top-Up .
