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If brake fluid loss is not externally visible, remove brake master cylinder. See MASTER CYLINDER under REMOVAL & INSTALLATION. Inspect brake booster for brake fluid. If brake fluid is not present, inspect all system hydraulic connections and repair as necessary. If brake fluid is present, remove brake fluid from brake booster and place into a measuring beaker.
If brake fluid volume is .11 qts. (.10L) or less, brake booster can be reused. The rolling diaphragm in brake booster is resistant to brake fluid, but not the reaction disc and poppet valve in the control element. When volume of brake fluid in brake booster is .11 qts. (.10L) or less, the brake fluid cannot reach the reaction disc or poppet valve in an installed brake booster. If volume of brake fluid in brake booster is more than .11 qts. (.10L), the brake booster is damaged must be replaced. See BRAKE BOOSTER under REMOVAL & INSTALLATION.

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.

Safety Warning

Brake Fluid Loss

Use the Manual With the Right Hardware

When to See a Mechanic