BLEEDING BRAKES. THOSE TINY BUBBLES CAN RUIN YOUR BRAKE JOB

This article provides information for auto mechanics on brake bleeding. It suggests bench bleeding for the GM master cylinder which is mounted at a 17 deg angle, making it harder to purge air bubbles in its normal mounted position. Manual brake bleeding, or pedal pumping, is a risky and slow method, which in the modern shop has been replaced by pressure bleeding. Other problems besides air bubbles in the hydraulic system are the presence of moisture in the brake fluid and a bleeder screw that is seized and won't turn. Helpful suggestions are offered which will give customers the kind of firm brake pedal that will keep them satisfied and confident in a mechanic's ability as a brake mechanic. An insert with this article describes a new type of brake-system bleeder which uses a partial vacuum to draw air and fluid from the system.

  • Corporate Authors:

    Hearst Books

    Motor Books Department, 224 West 57th Street
    New York, NY  United States  10019
  • Authors:
    • Cerullo, B
  • Publication Date: 1983-12

Media Info

  • Features: Photos;
  • Pagination: 4 p.
  • Serial:
    • Motor
    • Volume: 160
    • Issue Number: 6

Subject/Index Terms

Filing Info

  • Accession Number: 00387825
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-036 528
  • Files: HSL, USDOT
  • Created Date: Aug 30 1984 12:00AM