Need some ideas!
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
Need some ideas!
Ok, so my buddies '93 F350 4x4 we are messing with the brakes. There is NO resistance on that pedal whatsoever. I can see the brake fluid raise in the reservoir when the brakes are applied. I don't see any leaks around the wheel cylinders. I am wondering about the vacuum pump. After shutting it down, I pulled the vacuum line off the brake booster and I heard a "shoosh". So does that mean the vacuum pump is working? The brake booster is quiet. So I am not suspecting that. There is a little fluid where the master cylinder reservoir is wet where the seam is. But not spewing or even bubbling out. Kinda stumped here. All the brake lines are dry. The drivers side front axle is wet but no where near the brake lines or the brake cylinders. But it is SOAKED. I have laid under there and watched and watched while the brakes were being pumped. Any ideas? We are going to bleed the brakes and see if there is air in the lines. We ran out of time today. The reservoir is full.
Thanks guys.
Thanks guys.
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
PLC it is soaked at the hub on the BOTTOM side of the knuckle and u-joint. NO trails of fluid anywhere. Trying a master cylinder would take that out of the equation.
Otahyoni there is not any fluid between the master and the booster. It is dry.
We are just going to take everything apart next weekend and find the leak, it has to be coming from somewhere. Just curious as to why there is NO pedal pressure at all. I am hoping we can bleed the brakes to get some pressure. Gonna be hard to do that if no fluid is moving.
Otahyoni there is not any fluid between the master and the booster. It is dry.
We are just going to take everything apart next weekend and find the leak, it has to be coming from somewhere. Just curious as to why there is NO pedal pressure at all. I am hoping we can bleed the brakes to get some pressure. Gonna be hard to do that if no fluid is moving.
Postmaster
Joined: Apr 2009
Posts: 4,086
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From: Malahat/Cowichan Valley
Bottom side of the knuckle and ujoint at the axle tells me the axle seal let go, check the diff vent for blockage. Happened to mine. cleared the blockage and stopped leaking. I dont believe it would be brake fluid there. Doesnt help the brake situation but might help ya.
Logistics Pro
Joined: Sep 2007
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From: Western Mass
I'll second the axle seal leaking, unless you are certain that its brake fluid that made the axle wet.
As far as I know, if you push the pedal, the level in the master cylinder should stay the same. When you release the pedal, it could drop if there was a leak. If its rising up when you hit the pedal, I'm pretty certain that means the master cylinder is shot. If you had a leak somewhere, you would have found it by now.
Did you pull the drums to look at the rear cylinders? If its a new leak, it might not have trickled down enough to show up from the outside, especially if the drums are full of brake dust.
As far as I know, if you push the pedal, the level in the master cylinder should stay the same. When you release the pedal, it could drop if there was a leak. If its rising up when you hit the pedal, I'm pretty certain that means the master cylinder is shot. If you had a leak somewhere, you would have found it by now.
Did you pull the drums to look at the rear cylinders? If its a new leak, it might not have trickled down enough to show up from the outside, especially if the drums are full of brake dust.
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Elder User
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From: Tulsa, OK
Thanks tecgod, that is kinda what I was thinking. I just wanted someone elses opinion. Ok wreck, as far as the axle seal goes you are saying the clear the vent and it will stop leaking? Will we still have to replace the seal?
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Elder User
Joined: Sep 2006
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From: Tulsa, OK
Thanks bud!!!!!! Will do!!
Posting Guru
Joined: Feb 2011
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From: Princeton MN
THere should be a slip in there explaining how to do it, some come with plugs and you cycle the master cylinder on the bench before putting it in the truck, the old style on my 84 had 2 little hoses that hooked to the 2 ports the you routed them back to the top to return the fluid to the resivor. Basically what you are doing is filling the piston bore with fluid
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