• Hint: Use a descriptive title for your new message
    If you're looking for help and want to draw people in who can assist you, use a descriptive subject title when posting your message. In other words, "1995 Trans Am" isn't going to indicate to anybody that you need help. However, "Need help with my 1995 Trans Am" will. Be as descriptive as you can. Please use common sense... This message can be closed by clicking the X in the top right corner.

'02 Grand Am front disc brake issue

Rumrumm

New member
Replaced at one time the front hubs, rotors, pads, calipers, master cylinder, and brake hoses. Had the brakes bled professionally, due to needing the special software to bleed the ABS system. Very soft pedal after two separate trips to the shop. The pedal was solid and firm before changing any parts, just overhauled due to high mileage. What else could cause this pump-the-pedal-and-pray situation?
 

Rumrumm

New member
The mechanic said he did. I installed everything else, then took it to his shop for bleeding. Spongy pedal at that time, so he said it's probably the master cylinder, so had him replace it, re-bleed, and no change.
 

melsg5

Staff member
SUSTAINING MEMBER
19,561
69
48
This is the manual bleed procedure from the Autozone site. The cut and paste may have thrown off the numbering and lettering of the steps.


Manual Bleeding


  1. Clean the master cylinder fluid reservoir cover and surrounding area, then remove the cover.
  2. Add fluid, if necessary to obtain a proper fluid level, then put the reservoir cover back on.
  3. Prime the ABS hydraulic modulator/master cylinder assembly as follows:
    1. Attach a bleeder hose to the rearward bleeder valve, then submerge the opposite hose end in a clean container partially filled with clean brake fluid.
    2. Slowly open the rearward bleeder valve.
    3. Depress and hold the brake pedal until the fluid begins to flow.
    4. Close the valve, then release the brake pedal.
    5. Repeat Steps 3b-3d until no air bubbles are present.
    6. Relocate the bleeder hose to the forward hydraulic modulator bleeder valve, then repeat Steps 3a-3e.

      Click image to see an enlarged view


      Fig. ABS hydraulic modulator/master cylinder bleeder locations


  4. Once the fluid is seen to flow from both modulator bleeder valves, the ABS modulator/master cylinder assembly is sufficiently full of fluid. However, it may not be completely purged of air. At this point, move to the wheel brakes and bleed them. This ensures that the lowest points in the system are completely free of air and then the assembly can purged of any remaining air.
  5. Remove the fluid reservoir cover. Fill to the correct level, if necessary, then fasten the cover.
  6. Raise and safely support the vehicle.
  7. Proceed, as outlined in the following steps, to bleed the wheel brakes in the following sequence: right rear, left rear, right front, then left front.
    1. Attach a clear plastic bleeder hose to the bleeder valve at the wheel, then submerge the opposite hose end in a clean container partially filled with clean brake fluid.
    2. Open the bleeder valve.
    3. Have an assistant slowly depress the brake pedal.
    4. Close the valve and slowly release the release the brake pedal.
    5. Wait 5 seconds.
    6. Repeat Steps 7a-7e until the brake pedal feels firm at half travel and no air bubbles are observed in the bleeder hose. To assist in freeing the entrapped air, tap lightly on the caliper or braking plate to dislodge any trapped air bubbles.

  8. Repeat Step 7 for the remaining brakes in the sequence given earlier.
  9. Carefully lower the vehicle.
  10. Remove the reservoir cover, then fill to the correct level with brake fluid and replace the cap.
  11. Bleed the ABS hydraulic modulator/master cylinder assembly as follows:
    1. Attach a clear plastic bleeder hose to the rearward bleeder valve on the modulator, then submerge the opposite hose end in a clean container partially filled with clean brake fluid.
    2. Have an assistant depress the brake pedal with moderate force.
    3. Slowly open the rearward bleeder valve and allow the fluid to flow.
    4. Close the valve, then release the brake pedal.
    5. Wait 5 seconds.
    6. Repeat Steps 11a-11e until no air bubbles are present.
    7. Relocate the bleeder hose to the forward hydraulic modulator bleeder valve, then repeat Steps 11a-11f.
  12. Carefully lower the vehicle, then check the brake fluid and add if necessary. Don't forget to put the reservoir cap back on.
  13. With the ignition turned to the RUN position, apply the brake pedal with moderate force and hold it. Note the pedal travel and feel. If the pedal feels firm and constant and the pedal travel is not excessive, start the engine. With the engine running, recheck the pedal travel. If it's still firm and constant and pedal travel is not excessive, go to Step 17.
______________________________
 

Rumrumm

New member
Turns out I had the calipers swapped, with the bleed screws down low. The mechanic reversed them and rebled, and brakes like it just came off the showroom floor. Embarrassed, but happy!
 
Top