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My Brakes Are Weird And It's Not My Fault! I Swear!

 
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Old 05-31-2019, 08:06 PM   #1
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My Brakes Are Weird And It's Not My Fault! I Swear!


Within the last few years I've decided that I should be an adult and have somebody else fix the brakes on my van, because that's a lot of weight, and van brakes are more annoying than sedan brakes.

So I've been doing that for 4 years or so. I've had the fronts and rears done as well as the lines and the master cylinder. Never had a single issue.... until....

I pulled into a parking lot today and the pedal dropped to the floor. Troubling. Undaunted, and I must say, cool under pressure, I pumped them a bit and slowed enough that I got into a space and parked without incident, which was cool.
Popped the hood and I saw that the cap from the lower(smaller) reservoir on the master cylinder had popped off and fluid was leaking everywhere. Now, I'm not a smart man, but I know that that cap is supposed to be on. I put it back on, then drove it home, slowly, on back roads. No issue going home. Once I was on my (very flat)block I intentionally hit them hard to try to get the top to pop off again with pressure. It didn't. I stopped regularly.

If I may use a classic Jersey line, "The **** goes on here?"

What can cause the MC reservoir lid to pop off like that? I don't want this happening while I'm on a highway or something. What's the deal?
I've never seen this before.

Judges?
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Old 05-31-2019, 08:41 PM   #2
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


I'm gonna go out on a limb and say that somebody just brain-farted and didn't screw the cap on properly.

Amazing that it was where you could find it and put it on. Even more amazing that you used the old school trick of pumping the brakes--back in the day, that sort of thing was so routine that hardly anyone mentioned it. They just did it.

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Old 05-31-2019, 09:08 PM   #3
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


It's a rubber press on lid more than a screw cap. When I'm confronted with adversity, I affect whatever change I can from where I'm sitting. If my brake pedal falls to the floor I have exactly 4 choices as far as I can figure:

1. Bail. I open the door and tuck and roll and let the chips fall where they may. Kid was in the van with me. Not an option.

2. Emergency brake. Seems rash. Let's see where this journey is taking us first.

3. Try to jam it in park. Easy now. Now need for the nuclear option yet. I've still got one card left up my sleeve.

4. Pump the brakes. I dunno. Could work. Let's start there.

There, now you know everything.
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Old 05-31-2019, 10:10 PM   #4
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


Is it a vented cap with a little rubber diaphragm? Perhaps the vent is plugged....but that doesn't explain the lack of brakes...

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Old 05-31-2019, 10:26 PM   #5
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


My guess is the fluid was checked, cap not reinstalled properly. There is no pressure in the reservoir when you step on the pedal.

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Old 05-31-2019, 10:59 PM   #6
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


The cap popping off does not directly effect hydraulics-brake function. Now if the cap is off, brake fluid tends to spurt out the top as a function of overflow/fast pressure fluctuations of the system.

Was the reservoir full or close to full when you found the cap? Thinking maybe you sucked some air into the system. Either from it being low or fluid moving back and forth in the reservoir? I have never had a true system brake failure ever appear then disappear. Goes from huh, to wth to WTF!!! TO get the flock outta my way. Mostly brake lines rotting out, joys of living in the rust belt and MC failures. And then there's the time the '65 P500 step van's rear brake cylinder over extended and popped out. Instant nothing, pedal to metal and it stayed.... oh crap!
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Old 05-31-2019, 11:54 PM   #7
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


Not sure why the cap would pop off

No brake pedal would indicate a leak somewhere or air in the lines

My guess would be the master cylinder is on the way out because, you regained brake pressure without bleeding the lines

I would urge you not to drive the vehicle until the brake system has been thoroughly inspected .
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Old 06-01-2019, 09:27 AM   #8
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


You don't just have to throw in in P, you can put in 1 first.

The detente grind off fast.
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Old 06-01-2019, 09:28 AM   #9
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


X2 on either a plugged vent or it wasn't secured.
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Old 06-01-2019, 06:47 PM   #10
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


When I was young I had an old Ford Pinto. Completely lost the brakes and used the parking brake to come to a stop for a couple weeks. We improvised back then!!! Lol


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Old 06-01-2019, 06:51 PM   #11
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


You can always Fred Flinstone it
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Old 06-01-2019, 10:02 PM   #12
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


Quote:
Originally Posted by Inner10 View Post
Is it a vented cap with a little rubber diaphragm? Perhaps the vent is plugged....but that doesn't explain the lack of brakes...

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Braking fluid systems cant be vented. It has to be sealed from outside air


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Old 06-02-2019, 01:24 AM   #13
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


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Braking fluid systems cant be vented. It has to be sealed from outside air


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Inner us talking about the hard cap with the rubber diaphragm which provides the sealing and expands and contracts as the fluid level rises and falls. The hard cap has a vent, the diaphragm doesn't.
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Old 06-02-2019, 03:24 AM   #14
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


We've had dual systems since forever. How old is that rickety assed van you drive ?

Meaning, in theory, unless your driving a real ghetto wreck, it'd be a rare day when both the front AND rear crap out at the same time and literally "go to the floor".

And seems I recollect that when the "combination valve" - that doohickey that has the metering, proportioning,differential switch - all in one - trips, it stays that way until a mechanic someone resets or bleeds the system.
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Old 06-02-2019, 07:31 AM   #15
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


The proportioning valve shuts off the front or rear lines depending on which side has loss of pressure, it is possible the valve is frozen in place though I have never seen one frozen. I also have never saw a master cylinder with a cap that could easily come off. Usually a bail wire that flips over lid or screw on cap.
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Old 06-02-2019, 08:01 AM   #16
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


Quote:
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Braking fluid systems cant be vented. It has to be sealed from outside air


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Many are, they have a slit in them. Some have a bellows under the cap.
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Old 06-03-2019, 04:36 PM   #17
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


Took it in today. Worst possible outcome.

There's nothing wrong. Nothing frozen or leaking. Braking system works perfectly. I said, but the cap was off. They said don't take the cap off.

I said how would it have come off? They asked how things were with my wife.
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Old 06-03-2019, 04:39 PM   #18
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


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Took it in today. Worst possible outcome.

There's nothing wrong. Nothing frozen or leaking. Braking system works perfectly. I said, but the cap was off. They said don't take the cap off.

I said how would it have come off? They asked how things were with my wife.
Now that's funny !
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Old 06-03-2019, 05:15 PM   #19
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


I'm definitely worth more to her alive than dead, but now I'm questioning whether the drop in income would be worth it to not have to put up with me.

But who would haul her **** home from the auction?

I guess whatever stronger guy with a Euro van she shacks up with...

Jeez. You think you can outfit a ProMaster with a treadmill? I gotta get my **** together.
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Old 06-03-2019, 05:32 PM   #20
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Re: My Brakes Are Weird And It's Not My Fault! I Swear!


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I'm definitely worth more to her alive than dead, but now I'm questioning whether the drop in income would be worth it to not have to put up with me.


Thats not the case with me

Hell, with the life insurance policy that I have on myself my wife would make out like a bandit

Especially with the AD&D rider that is attached to it would kick in from brakes failing on my vehicle




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