Vacuum Brake Booster: Adjustments

Clearance Between Push Rod And Primary Piston:

Calculate Clearance A:

Adjust the clearance "A" between the brake booster push rod and primary piston by calculating the clearance "A" from the "B", "C" and "D" measurements: A = B - C - D
Clearance "A" is 0.65 - 0.85 mm (0.0256 - 0.0335 inches)

NOTE: When brake booster negative pressure 67 kPa (9.7 psi) is applied, the clearance value will become 0.1 - 0.3 mm (0.004 - 0.012 inches)





If the clearance is not within the standard value range, turn the push rod screw to achieve desired length.