No pedal after rear pad caliper/hose replaced

  • 6 CYL
  • 2WD
  • 101,000 MILES
Greetings, My rear pads were worn, after pad replacement, the right rear brake would not release. I replaced both rear calipers, and both rear outer hoses. Bled the brakes, (all 4 wheels), but the brake pedal goes right to the floor - with the engine running. With the engine off, the pedal is fine. I am starting the think the Kelsey-Hayes module is defective. And why does the Kelsey-Hayes module have 5 fluid lines?

Thanks in advance for your assistance!

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have the same problem?
Wednesday, April 21st, 2010 AT 6:08 PM

1 Reply

If you had a brake paddle prior to the replacement of the calipers and hoses
Suspect air in the system and possible that the master cylinder went dry
NOTE:Air tends to cling to caliper walls. When bleeding vehicles with disc brakes, lightly tap caliper to help remove air.

Deplete vacuum reserve from power brake booster by depressing brake pedal several times with engine off. Fill master cylinder and keep at least three quarters full during bleeding procedure. If master cylinder is not known or suspected to have air in bore, go to step 4. If master cylinder is known or suspected to have air in bore, go to next step.
Disconnect forward brakeline fitting at master cylinder. Allow fluid to flow from fitting. Tighten fitting to specification. See TORQUE SPECIFICATIONS. Have an assistant depress brake pedal slowly and hold. Loosen forward fitting. Tighten fitting while pedal is still at floor. Release brake pedal slowly. Wait 15 seconds.
NOTE:Rapid pumping of brake pedal causes master cylinder secondary piston to move into a position that makes bleeding system difficult.

Repeat step 2, including 15 second wait, until fluid is clear and free of air bubbles. Repeat procedure at other (rearmost) brakeline fitting on master cylinder. Master cylinder is now bled. If wheel cylinders/calipers are not suspected to have air in them, it is not necessary to bleed them.
NOTE:On vehicles with 4WAL, if brake pressure modulator valve was replaced, or is suspected to have air trapped inside, it must be bled next. See appropriate ANTI-LOCK article.

If wheel cylinders/calipers are known or suspected to have air in them, raise and support vehicle. Remove bleeder valve cap from right rear wheel. Place proper size box end wrench over bleeder valve. Attach one end of clear tube over valve and submerge other end in container partially filled with clean brake fluid.
Have an assistant depress brake pedal slowly and hold. Loosen bleeder valve to purge air from cylinder. Tighten bleeder valve and slowly release brake pedal. Wait 15 seconds. Repeat sequence, including 15 second wait, until all air is removed.
Remove tube and wrench. Repeat step 5 at left rear, right front, and left front wheels in this order. Fill master cylinder reservoir, and install cover. Ensure there is no sponginess in brake pedal and that BRAKE warning light is off.
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Thursday, April 22nd, 2010 AT 6:44 AM

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