Chevrolet Nova/ChevyII 1962-1979

Bleeding Brake System

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The hydraulic brake system must be bled any time one of the lines is disconnected or air enters the system. This may be done manually or by the pressure method. The correct bleeding sequence is: left rear wheel cylinder, right rear, right front, and left front.

PRESSURE BLEEDING



  1. Clean the top of the master cylinder, remove the cover, and attach the pressure bleeding adapter.
  2.  

On cars with front disc brakes, the spring-loaded plunger on the front of the proportioning valve must be depressed while bleeding. Wire or tape can be wrapped around the valve to hold the plunger in.

  1. Check the pressure bleeder reservoir for correct pressure and fluid level, then open the release valve.
  2.  
  3. Fasten a bleeder hose to the wheel cylinder bleeder nipple and submerge the free end of the hose in a transparent receptacle. The receptacle should contain enough brake fluid to cover the open end of the hose.
  4.  
  5. Open the wheel cylinder bleeder nipple and allow the fluid to flow until all bubbles disappear and an uncontaminated flow exists.
  6.  
  7. Close the nipple, remove the bleeder hose, and repeat the procedure on the other wheel cylinders in sequence.
  8.  

MANUAL BLEEDING





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Fig. Fig. 1 When bleeding front disc brakes, the plunger at the front of the proportioning valve must be depressed



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Fig. Fig. 2 When bleeding the brakes, use fresh brake fluid from a sealed container-front disc brakes shown



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Fig. Fig. 3 Bleeding the rear drum brakes

An alternate to the pressure method of bleeding requires two people: one to depress the brake pedal and the other to open the bleeder nipples.

  1. Clean the top of the master cylinder, remove the cover, and fill the reservoir.
  2.  

On cars with front disc brakes, the spring-loaded plunger on the front of the proportioning valve must be depressed while bleeding. Wire or tape can be wrapped around the valve to hold the plunger in.

  1. Attach a bleeder hose and a clear container as in the pressure bleeding procedure.
  2.  
  3. Have the assistant depress the brake pedal to the floor, then pause until the fluid flow stops and the bleeder nipple is closed.
  4.  
  5. Allow the pedal to return and repeat the procedure until a steady, bubble-free flow is seen.
  6.  
  7. Tighten the nipple and move on to the other wheels, in sequence.
  8.  
  9. Check the master cylinder level frequently during this procedure. If the reservoir runs dry, air will enter the system and the bleeding will have to be repeated.
  10.  

 
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