Fitment: For Toyota 4Runner 2.7L 3.4L 1996 - 2000 Description： -Reference OE Number : 44610-3D700, 446103D700 R2518306, 532727 -Booster Has 2 Bolts Instead Of 4 Bolts In Front Of The Booster -Working principle: -A Vacuum Booster Works By Drawing In Air As The Engine Is Working, Creating A Vacuum On One Side Of The Booster, -The Differential Pressure Relative To The Normal Air Pressure On The Other Side Is Used To Enhance The Braking Thrust. -Symptoms Of A Failing Power Brake Booster: -When Vacuum Booster Is Damaged, It Should Be Replaced As A Whole. -Stiff Brake Pedal That Is Extremely Hard To Push .
