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Drum Brakes

Drum Brakes. Non-servo. Servo. Two different categories of drum brakes. Non-Servo. On Front Wheel Drive (FWD) vehicles it is necessary to have a more i neffective brake on the rear of the car. Non-Servo. Servo Action. The rear shoe does most of the work Wedging action.

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Drum Brakes

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  1. Drum Brakes

  2. Non-servo Servo Two different categories of drum brakes

  3. Non-Servo • On Front Wheel Drive (FWD) vehicles it is necessary to have a more ineffective brake on the rear of the car.

  4. Non-Servo

  5. Servo Action The rear shoe does most of the work Wedging action

  6. Non Servo brake lining • Servo Brake lining • Primary • Secondary

  7. It is very important that the Primary shoe is always facing toward the front of the car

  8. The Secondary shoes always face toward the rear of the car

  9. Drum Removal • Groves from the rivets wearing into the drum. • The last brake job...the drums weren’t turned

  10. Drum Removal

  11. Drum Removal

  12. Things To Look For

  13. Worn Drums • Scored • Bell Mouthed • Concaved

  14. Max. Drum size Why is this important

  15. Check the Wheel Cylinders for leaks

  16. Adjusters • Check them for wear • Frozen

  17. Axle Seals • Inside Leak • Outside Leak

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