GM Storm/Spectrum 1985-1993 Repair Guide

Brake System Bleeding

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See Figures 1 and 2

  1. Remove the vacuum reserve by applying the brakes several times with the engine OFF.
  2.  



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Fig. Fig. 1: Bleeding front brakes



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Fig. Fig. 2: Bleeding rear brakes

  1. Remove the master cylinder reservoir cap and fill the reservoir with brake fluid. Keep the reservoir at least 1 / 2 full during the bleeding operation.
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  3. If the master cylinder is replaced or overhauled, first bleed the air from the master cylinder and then from each caliper or wheel cylinder. Bleed the master cylinder as follows:
    1. Disconnect the forward brake line from the master cylinder.
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    3. Allow brake fluid to fill the master cylinder bore until it begins to flow from the forward connector port.
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    5. Connect the forward brake line to the master cylinder and tighten.
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    7. Have an assistant depress the brake pedal slowly once and hold it depressed. Loosen the forward brake line connector at the master cylinder to purge air from the bore. Tighten the connection, and then have the assistant release the brake pedal slowly. Wait 15 seconds. Repeat this sequence, including the 15 second wait, until all air is removed from the bore. Care must be taken to prevent brake fluid from contacting any painted surface.
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    9. After all air has been removed at the forward connection, repeat the procedure outlined above to bleed the master cylinder at the rear connection.
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  5. If it is known that the calipers and wheel cylinders do not contain air, it will not be necessary to bleed them.
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  7. If it is necessary to bleed all of the wheel cylinders and calipers, follow the sequence below:
    1. Right rear
    2.  
    3. Left rear
    4.  
    5. Right front
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    7. Left front
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  9. Bleed individual wheel cylinders or calipers only after all of the air is removed from the master cylinder assembly. Follow this service procedure:
    1. Place an appropriate box end wrench or equivalent over the bleeder valve.
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    3. Attach a clear tube over the bleeder valve and allow the tube to hang submerged in a clear container partially filled with clean brake fluid.
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    5. Have a helper depress the brake pedal slowly one time and hold. Loosen the bleeder valve to purge air from the cylinder. Tighten the bleeder valve and have the helper slowly release the brake pedal. Wait 15 seconds. Repeat the sequence, including the 15 second wait, until all of the air is removed.
    6.  
    7. It may be necessary to repeat the sequence 10 or more times to remove all of the air from the system.
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    9. Rapid pumping of the brake pedal pushes the master cylinder secondary piston down the bore in a way that makes it more difficult to bleed the rear side of the system.
    10.  

  10.  
  11. Check the brake pedal for sponginess and the brake warning lamp for an indication of uneven brake pressure. Repeat the entire bleeding procedure to correct either of these 2 conditions.
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