Mitsubishi 3000GT Service Manual page 891

Valve
Spring
Pressure
Proportioning valve Z,4L0,8,
Split point
output
pressure
Input pressure
SERVICE BRAKES
CHECK VALVE OPERATION CHECK
When checking the check valve, keep the check valve fit
in the vacuum hose.
1. Remove the vacuum hose.
Caution
The check valve is press-fit inside the vacuum hose
and do not remove the check valve from the vacuum
hose.
2. Check the operation of the check valve by using a vacuum
Connection at the brake A negative pressure (vacuum) is
booster side (1)
Connection at the intake
manifold side (2)
Caution
If the check valve is defective, replace it as an assem-
bly unit together with the vacuum hose.
PROPORTIONING VALVE FUNCTION TEST
1. Connect two pressure gauges, one each to the input
side and output side of the proportioning valve, as shown.
2. Air bleed the brake line and the pressure gauge.
3. While gradually depressing the brake pedal, make the
following measurements and check to be sure that the
measured values are within the allowable range.
(1) Output pressure begins to drop relative to input pres-
(2) Output fluid pressure when input fluid pressure is
(3) Output pressure difference between left and right
4. If the measured pressures are not within allowable ranges,
replace the proportioning valve.
created and held.
A negative pressure (vacuum) is not
created.
sure (split point).
Standard value:
Convertible
Hatchback 3.75-4.25 MPa (533-604 psi)
10 MPa (1,422 psi)
Standard value:
Convertible 6.72-7.52 MPa (856-1,070 psi)
Hatchback 5.82-6.62 MPa (828-842 psi)
brake lines
Limit: 0.4 MPa (57 psi)
I