Post subject: brakes Posted: Nov 10, 2013 - 11:38 PM
Joined: Oct 28, 2003
Location: Myrtle Beach South Carolina
Can anyone give me insight on the brake system. I have a problem with them being to soft, it takes 4 to 5 pumps to get them to just to get a bit on the rotors. I thought it was the master cylinder and put a new one on today and still the same. It seems like the throw is to short but I am using the explorer that is called out in the NAERC Plans.
It could be a few things.
Is the pushrod set correctly?
Remove the master cylinder fill cap and jab the brake pedal about 1 inch. You should get a shot of brake fluid into the reservoir from the cylinder. It could look like swirling activity in the reservoir. If the pushrod is set too tight (partially pushing the piston) it will have no way to reset the fluid and never release the air trapped inside.
The adjustment for this is on the booster behind the master cylinder. Also, your foot pedal rod pin should have zero tension on it.
Did you bench bleed the cylinder first? Run the cylinder through its entire travel on the bench with your fingers over the ports. Plug the ports on the return stroke.
After both of these settings are done you can now properly bleed the brakes.
The power brake booster is very difficult to push without vacuum applied. If your engine is not running, try connecting another cars booster line to your booster temporarily to get that extra bit during the bleeding process.