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ON-VEHICLE SERVICE TSB Revision BASIC BRAKE SYSTEM 35A-21 CHECK VALVE OPERATION CHECK M1351009000075 CAUTION The check valve should not be removed from the vacuum CAUTION If the check valve is defective, replace it as an assembly pump. PROPORTIONING VALVE FUNCTION TEST M1351001100078 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 (1) Output fluid pressure begins to drop relative to input fluid pressure (split point). Standard value: 2.7 − 3.2 MPa (391 − 462 psi) (2) Check that the output fluid pressure is at standard value when the input fluid pressure indicates 9.8 MPa (1,422 Standard value: 4.3 − 5.1 MPa (619 − 732 psi) (3) Output fluid pressure difference between left and right brake lines. Limit: 0.4 MPa (57 psi) 4. If the measured fluid pressures are not within allowable ranges, replace the proportioning valve. VACUUM PUMP CRITERIA Connection at the brake A negative pressure Connection at the intake A negative pressure AC000873 AB A B VALVE SPRING INTAKE BOOST- AC000874 PRESSURE GAUGE PROPORTIONING VALVE AB AC000875AB INPUT FLUID PRESSURE OUTPUT SPLIT POINT |