Vacuum Booster Seal Leak Diagnosis

Input Rod Seal
A fluid leak from the inside of the driver's compartment at the power brake booster vent hole indicates a damaged input rod seal (6). Replace the hydraulic brake booster. Refer to Hydraulic Brake Booster Replacement.

Power Piston Seal
Fluid leaking between the brake master cylinder and the power brake booster indicates damage of the power piston seal (4). Leaking fluid can possibly reduce the power assist. Replace the hydraulic brake booster. Refer to Hydraulic Brake Booster Replacement.

Housing Seal
A fluid leak between the 2 housings indicates a damaged housing seal (7). Replace the hydraulic brake booster. Refer to Hydraulic Brake Booster Replacement.

Relief Valve
Damage to the relief valve seal (2) causes fluid to leak past the relief valve. Replace the hydraulic brake booster. Refer to Hydraulic Brake Booster Replacement.

Spool Valve Plug Seal
Damage to the spool valve plug seal (3) causes fluid to leak past the spool valve. Replace the hydraulic brake booster. Refer to Hydraulic Brake Booster Replacement.

Accumulator Seal
Damage to the accumulator seal (5) causes fluid to leak past the accumulator cap. Replace the accumulator seal (5) with the power brake booster on the vehicle. Refer to Hydraulic Brake Booster Accumulator Replacement.