Check Valve Operation Check; Proportioning Valve Function Test; Vehicles Without Abs - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

Spring
Valve
A
Booster
side
Pressure gauge (A)
Output port
Pressure gauge (B)
Proportioning valve
Split point
Output
pressure
<Pressure
gauge (B)>
Input pressure
<Pressure gauge (A)>
BASIC BRAKE SYSTEM -

CHECK VALVE OPERATION CHECK

1. Remove the vacuum hose. (Refer to P.35A-17.)
2. Check the operation of the check valve by using a vacuum
B Intake
manifold
side

PROPORTIONING VALVE FUNCTION TEST

<Vehicles without ABS>
Output port
Caution
The proportioning valves are installed independently for
the right and left brake lines. Always measure each valve.
1. Connect two pressure gauges to the output port of the
2. Bleed the brake line and the pressure gauges. (Refer
3. Depress the brake pedal gradually. Then check that the
4. Depress the brake pedal more strongly than at the above
5. Measure each output fluid pressure at both valves, and
6. If the measured pressure exceeds the limit, replace the
On-vehicle Service
Caution
The check valve should not be disassembled from
the vacuum hose as they are united as one part.
pump.
Vacuum pump
connection
Connection at the brake
booster side (A)
Connection at the intake
manifold side (B)
Caution
If the check valve is defective, always replace it as
an assembly unit together with the vacuum hose.
master cylinder and output port of the proportioning valve.
to P.35A-10.)
split point, where the output fluid pressure begins to drop
in proportion to the output fluid pressure, is at the standard
value.
Standard value: 2.70 - 3.19 MPa
step. Then check that the output fluid pressure is at the
standard value when the input fluid pressure is 6.86 MPa.
Standard value: 3.68 - 4.17 MPa
check that the difference between the two is at the limit
value or less.
Limit: 0.49 MPa
proportioning valve.
35A-9
Accept/reject criteria
A negative pressure (vacuum) is
created and held.
A negative pressure (vacuum) is
not created.