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post #1 of (permalink) Old 05-10-2004, 07:40 PM
zirkdog420
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Leaking Brake Fluid/Height Sensing Valve??

I returnded home this weekend and found a large 1 ft. sq. puddle of brake fluid behind my left rear tire. It is leaking from what appears to be a vent hose from the height sensing proporioning valve as best I can tell. I don't see why a pressurized sysem would have a vent line,but I can't find where this hose goes or it's purpose. Anyone with some insight into this system and/or the problem would be most helpful, the Chilton's manual hasn't been too helpful. My fluid level is still up at the master cylinder, so I haven't lost too much.
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post #2 of (permalink) Old 05-11-2004, 12:56 AM
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Re: Leaking Brake Fluid/Height Sensing Valve??

the what? [img]images/graemlins/thud.gif[/img]

is the puddle actually under the tire or further inward? [img]images/graemlins/confused.gif[/img]
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post #3 of (permalink) Old 05-11-2004, 06:40 AM
 
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Re: Leaking Brake Fluid/Height Sensing Valve??

There is no vent on your brakes. If there were then you'd have no brakes. Brakes are hydro and I've never even heard of a height sensing valve. All I can think of is maybe somehow you got water in your differential and its leaking out your differential breather. That or somehow you seriously have got way too much gear oil. More realistically. Maybe you blew the brake cylinder. Is it leaking down your tire? or is it coming from somewhere else? A picture would help tremendously here. Don't leave out cruel practical jokes. I have friends that think it's funny to dump water under peoples cars as a joke.
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post #4 of (permalink) Old 05-11-2004, 11:24 PM
 
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Re: Leaking Brake Fluid/Height Sensing Valve??

If it ain't a wheel cylinder, like Norm suggests, I've got an idea what it is.

My steel brake line over the rear frame rail, that leads from the axle brake hose to the front of the truck, had rusted through last year.

Had to replace the whole line. Got the rear axle hose while i was there too.

BTW

Just did the front brake hoses today and the two steel lines from them to the union block under the master cylinder. The passenger's side one runs over the TTB.

They were really rusted out, glad I got to them now rather than waiting for them to blow. Check them out here;

http://www.superford.org/registry/ve...=17981#content

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post #5 of (permalink) Old 05-12-2004, 03:19 AM
 
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Re: Leaking Brake Fluid/Height Sensing Valve??

You do good work man. I've got to do brakes soon myself. I'm glad to hear they are so cheap. Cheap is good since alot of the junk I've bought isn't. All My exterior motor parts got a bath today in a parts washer. (damn I love those things) I'm going to leave the cylinder resurfacing and heads to the inmates at my local state prison. Nahhhh. I'm not scared. [img]images/graemlins/ooo.gif[/img]
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post #6 of (permalink) Old 05-12-2004, 03:30 PM
 
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Re: Leaking Brake Fluid/Height Sensing Valve??

I will agree with everyone no vent tube or height sensing valve thingy?! I just was under my truck trying to look at what your describing and I got to tell you, found nothing, Has to be wheel cylinder or brake line in that area. Although the vent from the diff did cross my mind, but shouldn't look like brake fluid. [img]images/graemlins/thud.gif[/img]-Bob
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post #7 of (permalink) Old 05-13-2004, 08:05 PM
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Re: Leaking Brake Fluid/Height Sensing Valve??

A further inspection and looking at some differnet pics in the manual revealed that the leak is coming from the axle vent. The metal barke lines run through the vent/junction block, so that is what lead me to believe that it was brake related. No I didn't think the brakes had a vent, I discounted that in my original post, but thanks for pointing out something i already clarified.
The bronc was parked sideways (vent side downhill) over a long weekend on a slope at my parking garage. Could something like this, and warm weather (expanding fluids) lead to a leak??
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