Replacement Of Brake Fluid Air Bleeding; Inspection Of Parking Brake; Inspection Of Power Brake Unit And Hoses - Mazda 121 Workshop Manual

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SCHEDULED MAINTENANCE SERVICES
REPLACEMENT OF BRAKE FLUID
AIR BLEEDING
1. Remove the brake fluid kom the reservoir by using a suc-
lon pump.
2. Fill the reservoir with new brake fluid.
Fluid apecllication: FMVSS 116: DOT-3
SAE: J1703
3. Attach a vinyltubeto the bleeder screw and place the oth-
er end ol the vinyl tube in a containel.
4. Pump out the old brake fluid by loosening each bleeder
screw (one by one) and pumping the brake pedal.
5. Bleed air as described below.
Cautlon
. The tluid in the reservolr must be maintalned al the
Z4 l€vel or higher durlng air bleeding.
. Be caretul nol to spill brake lluid onto Painted
surtaces.
'1. Jack up the vehicle and support it with salety stands
2. Remove lhe bleeder cap and attach a vinyl hose to the
bleeder plug.
3. Place the other end of the vinyl tube in a container.
4. Slowly pump the brake pedal several times.
5. Whilethe brake pedal is pressed, loosenthe bleeder screw
to let fluid and a'r escape.
6. Repeat steps 4 and 5 until there are no air bubbles in the
fluid.
7. Check for cotrect brake operation.
8. Check to be sure that there is no fluid leakage. Be sure to
clean away any spilled fluid with rags.
9. After bleeding the air, add brake fluid to the reservoir up
to the sDeciiied level.
INSPECTION OF PARKING BRAKE
1. Pullthe brake lever with 98 N (10 kg, 22 lb) ol force and
measure the lever stroke.
2. lf necessary, adjust the lever stroke by turning the adjust-
Ing nut.
Stroke: 6-8 noiches
INSPECTION OF POWER BRAKE UNIT AND HOSES
1. Check the vacuum hose, connectors and check-valve for
cracks, chafing, deterioration etc.
2. With the engine stopped, depress the pedal a few times
3. With the pedal depressed, start the engine.
4. lf, immediately after the engine starts, the pedal moves down
slightly, the unit is good.
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A-17

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