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#38796 04/14/2003 2:21 AM | Joined: Apr 2003 Posts: 8 Member | | Member Joined: Apr 2003 Posts: 8 | I rebuilt master cylinder and replaced entire rear wheel brake system. Have bleed system and have reasonable pedal. When you first get in truck and push brake pedal it will go to floor, but after one pump it is okay?? I did not bench blled master cylinder before putting back in truck. I have since bleed all wheel cylinders and got good flow, but still have pedal going to floor when you first hit pedal?? Any suggestions?? THANKS DAVE | | |
#38797 04/14/2003 2:30 AM | Joined: Jan 1970 Posts: 365 Shop Shark | | Shop Shark Joined: Jan 1970 Posts: 365 | Usually this is symptomatic of a bad residual check valve, which is located in the master cylinder. It is the last thing you installed in the master cylinder before you screwed the end on. It is the piece that looks like a helmet with holes in it, that the return spring rests on. Take the master cylinder apart again and inspect this carefully.
Also make double sure you have ALL the air out of the master cylinder and brake cylinders.
Yet another thing to check is that the brakes are adjusted properly, ie. very lightly touching the drums. You should be able to jack up the wheel and hear the brake shoes just barely touching the drums as you spin the wheel.
Hope this helps! | | |
#38798 04/14/2003 7:41 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | First thing to do is check your brake shoe adjustment at the wheels. Then look at other possibilities, (check-valve, a ballon effect on the brake hoses, etc)
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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#38799 04/15/2003 1:47 AM | Joined: Apr 2003 Posts: 8 Member | | Member Joined: Apr 2003 Posts: 8 | HOW MUCH BRAKE SHOE DRAG SHOULD THERE BE AFTER ADJUSTMENT? | | |
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