Load Sensing Proportioning Valve (LSPV)-Without Abs: Inspection

STEP 1. 

1. Check whether the rear brake applied earlier than the front brake when the vehicle is empty and stops suddenly.
2. Check the brake works effectively enough when empty vehicle, full loading, and moving backward.
3. Check the brake works effectively when the vehicle moves straight forward and with full loading.

STEP 2. 

1. If there is a problem with step 1, check the pressure of LSPV.
2. The pressure can be checked by using a pressure gage for both input and output.
3. The measuring condition will be Empty vehicle + One passenger.
4. Stop the engine and set the vacuum of power brake unit to 0. (Depress the brake pedal 10 times).

STEP 3. 

1. Disconnect the outlet pipe joint of LSPV, and install a pressure gage 9810 kPa (100 kg/cm² , 1422 psi) at there.
2. Disconnect the front brake pipe from the master cylinder, and install a pressure gage.
3. Bleed the air from the brake system.
4. Depress the brake pedal until the master cylinder pressure equal to A, then record rear brake pressure A'.
5. Depress the brake pedal again, and apply additional pressure until the pressure equal to B, then record pressure B'.
   CAUTION: If the pressure exceeds the specification, replace the LSPV.

   Specification (Dynamic condition)

   Fig 1: Load Sensing Proportioning Valve Specifications (1 Of 3)

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 2: Load Sensing Proportioning Valve Specifications (2 Of 3)

   Courtesy of KIA MOTORS AMERICA, INC.
   Fig 3: Load Sensing Proportioning Valve Specifications (3 Of 3)

   Courtesy of KIA MOTORS AMERICA, INC.