Loaded Condition; Checking For Hydraulic Pressure; Inspection Of Check Valve - Mazda MX-5 1990 Workshop Manual

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05UOPX-025
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05UOPX·027
05UOPX·028
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BRAKE SYSTEM
Loaded condition
1. Start the engine.
2. Depress the brake pedal with a force of 196 N (20 kg, 44
Ib).
3. With the brake pedal depressed, stop the engine when the
vacuum gauge indicates 500 mmHg (19.7 inHg).
4. Observe the vacuum gauge for 15 seconds. If the gauge
indicates 475-500 mmHg (18.7-19.7 inHg), the unit is
operating.
b) Checking for hydraulic pressure
1. If with the engine stopped (vacuum 0 mmHg [0 inHg]) the
fluid pressure is within specification, the unit is operating.
Pedal force
196 N (20 kg, 44 Ib)
Fluid pressure
1,079-1,177 kPa
(11-12 kg/cm
2
,
156-171 psi)
2. Start the engine. Depress the brake pedal when the vacu-
um reaches 500 mmHg (19.7 inHg). If the fluid pressure
is within specification, the unit is operating.
Pedal force
196 N (20 kg, 44 Ib)
Fluid pressure
5,199-5,494 kPa
(53-56 kg/cm
2
,
754-796 psi)
Inspection of check valve
Note
• The check valve is pressed into the vacuum hose.
There is an arrow on the hose to indicate direction
of hose installation.
Inspection
1. Disconnect the vacuum hose from the engine.
2. Apply suction and pressure to the hose from the engine side.
Verify that air flows only toward the engine. If the air pass-
es in both directions or not at all, replace the vacuum hose
(along with the check valve).