DESCRIPTION
Hydraulic system bleeding is necessary any time air has been introduced into system. Bleed brakes at all 4 wheels if master cylinder lines have been disconnected or master cylinder has run dry. Bleed brakes with vacuum bleeding equipment, pressure bleeding equipment or by manually pumping brake pedal while using bleeder tubes. Always bleed brake lines in sequence. See BLEEDING SEQUENCE table in this article.
Note. Hydro-Boost bleeding procedure is different than hydraulic brake bleeding. See BRAKE SYSTEM article.
Scheme 1
- Master cylinder must be bled before installation to prevent excessive amounts of air from entering the brake system, creating poor brake operation.
- Place master cylinder in soft-jawed vise. DO NOT tighten vise enough to damage master cylinder. Install bleeder tubes in both outlets of master cylinder. (Scheme 1)
- Fill master cylinder with clean DOT 3 brake fluid. Ensure ends of bleeder tubes are submerged in brake fluid.
- Using proper sized rod, apply and release master cylinder until no air bubbles exist in brake fluid flow. Once all air bubbles are gone from master cylinder secure cap and install.
- Bleeder tubes should be left installed on master cylinder until master cylinder in installed. Master cylinder must be bled at wheels after installation.