2015 Nissan-Datsun Sentra SRFACTORY OEM SERVICE PROCEDURE

Component Parts And Function

Component Function
Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1
Cut valve 2		 Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2		 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each valve when brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when decreasing pressure of brake caliper and wheel cylinder.
Pressure sensor Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).


Component Function
Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pump according to signals from ABS actuator and electric unit (control unit).
Cut valve 1
Cut valve 2		 Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2		 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Return check valve Returns the brake fluid from brake caliper and wheel cylinder to master cylinder by bypassing orifice of each valve when brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when decreasing pressure of brake caliper and wheel cylinder.
Pressure sensor Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.