3-5-12
Orig
CD373
Chapter 3
Section 5 MZ Tow Tractor
3. Pressure Bleeding
(a) If the equipment is available, pressure bleeding is faster, since the master cylinder
does not have to be refilled several times. Pressure bleeding equipment must be of
the diaphragm type. That is, it must have a rubber diaphragm between the air supply
and the brake fluid to prevent air, moisture, oil and other contaminants from entering
the hydraulic system. Install the special bleeding adapter to the master cylinder.
Make sure that the pressure tank is at least 1/3 full of fluid.
Position the tank so that its hose will easily reach the adapter on master cylinder of
the vehicle being serviced, then make the air pressure connection to the tank (20 to
25 psi). Open the tank valve to bleed all air out of the hose before connecting it to
the adapter. After making this connection, open the valve when ready to begin
bleeding.
NOTE: Do not lift, move, or shake the pressure tank after air pressure is
applied. This may cause air to become trapped in the fluid.
(b) Bleed front calipers.
NOTE: Pressure bleeding process may be completed more quickly by lightly
tapping the brake pedal when the bleeder valve is opened. This creates
pulsations that tend to purge air from the system.
4. Check-Out
(a) Check brake pedal for sponginess or hard pedal.
(b) Drive vehicle slowly and make several slow speed stops.
(c) Check all brake fluid line fittings and caliper areas for fluid leakage.
(d) Correct any discrepancies before returning vehicle to normal service.
Note
Note
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