Triumph TR6 PI Operation Manual page 366

BRAKES
BRAKES - BLEED
70.25.02
I. Check the level of fluid in the master cylinder
reservoir and top up as necessary.
2. Depress the brake pedal to destroy the vacuum in the
servo. Do not bleed the brakes with the engine
running.
3. Attach a bleed tube to the nipple of the rear wheel
cylinder farthest (longest pipe run) from the master
cylinder. Allow the free end of the tube to hang
submerged in brake fluid in a trasparant container.
4. Slacken the bleed nipple (90
0
to 180
0
is usually
adequate) and depress the brake pedal. On models
fitted with a Pressure Differential Warning Actuator
(P.D.W.A.) do not apply either hard pressure or full
travel to the brake pedal in order to avoid moving
P.D.W.A. shuttle out-of-centre.
5. Allow the brake pedal to return to its idle position
and again depress. Continue lIntil fluid discharge from
the wheel cylinder is seen to be free of air bubbles.
6. Hold the brake pedal depressed, close the bleed
nipple and remove the bleed tube.
7. Repeat above procedure on the opposite rear wheel
cylinder.
8. Bleed the front calipers in· similar manner
commencing at the caliper farthest from the master
cylinder.
9. Check the fluid level in the reservoir and top up. It is
important to ensure that the reservoir fluid is never
permitted to fall so low that air can be admitted to
the master cylinder. When topping up the reservoir do
not use the aerated and possibly contaminated fluid
discharged during the process of bleeding.
10. P.D. W.A. models only. Switch on the ignition and
observe the brake failure light for indication that the
P.D.W.A. is centralised. (Both the oil warning light
and the brake failure warning light glowing dimly). A
b rightly glowing
br~ke
failure light and no
illumination from the oil warning light is indicative
that the P.D.W.A. shuttle has been displaced. To
re-centre the shuttle it is necessary to open the bleed
nipple on the circuit opposite to that to which the
shuttle has moved and depress the brake pedal until
the brake failure light and the oil light glows.
70.25.02
Triumph TR6 ManuaL Part No. 545277 Issue]