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Home >> Volkswagen >> 2013 >> Beetle TDI, 2D Hatchback, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 988 (Brake System - General Information) >> General Procedures >> Component Bleeding >> Master Cylinder Priming
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Master Cylinder Priming

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Do not use any fluid other than clean brake fluid meeting manufacturer's specification. Additionally, do not use brake fluid that has been previously drained. Following these instructions will help prevent system contamination, brake component damage and the risk of serious personal injury.
WARNING: Carefully read cautionary information on product label. For EMERGENCY MEDICAL INFORMATION seek medical advice. In the USA or Canada on Ford/Motorcraft products call: 1-800-959-3673. For additional information, consult the product Material Safety Data Sheet (MSDS) if available. Failure to follow these instructions may result in serious personal injury.
CAUTION: Bleeding the master cylinder on Hybrid vehicles requires a full system pressure bleed. For additional information, refer to Brake System Bleeding - Hybrid .
CAUTION: Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with clean, specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system or damage to the brake system components may occur.
CAUTION: Brake fluid is harmful to painted and plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.
NOTE: When the brake master cylinder has been replaced or the system has been emptied, or partially emptied, it should be primed to prevent air from entering the system.
  1. Disconnect the brake tubes from the master cylinder.
  2. Install short brake tubes with the ends submerged in the brake master cylinder reservoir and fill the brake master cylinder reservoir with clean, specified brake fluid.
  3. Have an assistant pump the brake pedal until clear fluid flows from both brake tubes, without air bubbles.
  4. Remove the short brake tubes and install the brake outlet tubes.
  5. Bleed each brake tube at the brake master cylinder as follows:
    1. Have an assistant pump the brake pedal at least 2 times and then hold firm pressure on the brake pedal.
    2. Loosen the rearmost brake tube fitting until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the brake tube fitting.
    3. Repeat this operation until clear, bubble-free fluid comes out.
    4. Refill the brake master cylinder reservoir as necessary. Repeat the bleeding operation at the front brake tube.
    5. Tighten the brake tube fittings to 23 Nm (17 lb-ft).
  6. Bleed the brake system, refer to Brake System Bleeding .
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