3000GT SL V6-2972cc 3.0L DOHC MFI (1997)
Brake Proportioning/Combination Valve: Testing and Inspection
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.
4. Output pressure begins to drop relative to input pressure (split point). The standard value for the hatchback is 3.67-4.17 MPa (522-593 psi). The
standard value for the convertible is 4.85-5.35 MPa (690-761 psi).
5. Check that the output fluid pressure is at the standard value when the input fluid pressure increases according to the items listed below.
Input fluid pressure
Convertible . . . 7.85 MPa (1,117 psi).
Hatchback . . . 6.37 MPa (906 psi).
Output fluid pressure
Convertible . . 5.95-6.45 MPa(846-917 psi).
Hatchback . . . 4.58-5.08 MPa (651-723 psi).
6. Output pressure difference between left and right brake lines. The limit is 0.4 MPa (57 psi).
7. If the measured pressures are not within allowable ranges, replace the proportioning valve.
