RF brake dragging
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Joined: Oct 2003
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RF brake dragging
On a 97 F-150 2wd, the RF brake is dragging and causing a lot of heat buildup. This is not a daily driven truck by any means and is really only used to haul a race car to the track. I tried to bleed the RF corner and when I popped the bleeder, very little would come out, even with someone pushing down on the pedal. I know that the rubber lines are available, but is the hard line available anywhere? It seems to have some oddball fittings, at least according to the info I got from RockAuto. Anyone have any ideas other than the line(s), or have an idea of which one it may be. I'm guessing the hard line, but that is really only a guess.
John
John
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If it was the just "piston is sticking in bore" brake fluid would still gush out w/o restraint. The calipers also must be able to slide freely on their pins, but that doesn't restrict flow either. Tougher to diagnose would be a bad return valve in the master cylinder, but that too wouldn't restrict flow to the wheel, only the return. How old is your brake fluid? No telling what's going on with "oddball fittings".
The lack of flow "even with someone pushing down on the pedal" sounds exactly like an old rubber flex line that has swelled inside blocking flow, but could also be as simple as a plugged bleeder screw.
The "heat build up" by itself is likely to have compromised the rotor, pads & cylinder. Can you say completely rebuild front brakes?
The "heat build up" by itself is likely to have compromised the rotor, pads & cylinder. Can you say completely rebuild front brakes?
Thread Starter
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No, I already tried pulling the bleeder screw all the way out. No real change in flow. Brake fluid is older (has been flushed once before), and I was going to do it again but couldn't get fluid to pull through. It was literally just dribbling out of the RF caliper with pedal pressure applied.
John
John
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Joined: Oct 2005
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From: Louisville, Kentucky
Disconnect the hard line from the rubber hose and see if you get good flow then. If you do, then replace the rubber hoses on both sides. Good luck! 
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Laughing Gas
Joined: Jan 2006
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From: Minnesota
If you pull the line at the caliper, do you get flow? I once had a truck where all the bleeders were all beat up and dirty. The PO thought they were grease fittings...true story,
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