No leaks I've found. Fluid level good. In fresh snowfall, I applied medium pressure and it seems left front and rear slid but both right kept rolling. I repeated on two surfaces and got same results. I admit I'm no Daniel Boone so not sure of my tracking results.

Any suggestions?

 

Clean and lube the caliper sliding surfaces. Make sure the caliper pistons aren't sticking. Replace the flexible brake hoses.

 

Bleed the whole system and do a brake fluid exchange.

 

thx for the replies folks. I'll proceed per advice. I'm very curious about why both passenger side wheels would fail and not drivers side. I am right that master cylinders are split front and back, not side to side, right?

 

Yeah, that's why I suspect sticking caliper pistons.

 

On hold for a few days till temperature goes above zero. Meanwhile, still not sure how dual passenger side failures leads to likelihood of caliper binding. I'd appreciate education on this diagnostic.

thx

 

Corrosion from the right wheels running in the ditch frequently?

Isn't your ABS working?

Would be nice to know what you are working on.

 

Not sure about ABS. I haven't applied any heavy braking since I found problem. Should ABS work through a caliper problem?

Vehicle is 1998 F150. Disc front, drum rear. 4.6 engine.

 

That probably only has rear wheel ABS, it was standard. 4 wheel ABS was an option.

If a wheel locks up and slides, the ABS is not working.

 

I think I"ve confirmed right front caliper sticks but opens up if you tap caliper. I haven't checked others yet. Now being interrupted by surgery for wife. Will get back on it as soon as possible.

 

Either the caliper is sticky or the rubber hose is collapsing.

 

Found totally destroyed shoe on right side rear and replaced. I wasn't real happy with the way wheel felt when I put the drum back on. Test drive off road below 25 mph for 1 mile showed drum hot to the touch. Wondering if I did something wrong or is this normal as brake shoes wear in?

 

Not normal for the drum to be really hot. Hot to the touch may be normal. if it is hotter than normal You either adjusted the shoes too tight or the wheel cylinder is sticking. I always rebuilt the wheel cylinders when I replaced shoes because I found out the hard way that they most likely would start leaking if I didn't because the pistons were pushed back on rusted cylinders and the seals wouldn't hold. Sounds like yours may be sticking.

 

Thx for the response. Adjusting screw was full in so implies cylinder problem. Only reason I question that is that the shoes appear to be contacting the anchor pin at the top.(I have pics, but can't figure out how to attach them). I'm headed out to jack it up and pull both rears so may find something else.

 

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