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Re: Treadlrvac???????
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Forum Ambassador
 
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Quote:
1. if the compensator port fails (even just slightly) there will be NO brakes as in absolutely NO BRAKEING effect WHATSOEVER.. So pushing fluid down the lubricator gallery is a moot point. My BTV never failed. NOT ONCE! But i had to continualy fill the cylinder about every 200 miles. I was only responding to your question about presence of fluid on the vacuum cylinder. I've only had to top off the M/Cs in those Packards that still used glycol-based fluids once or twice a year, but I'm not drving any of them daily - not at all in several years, now. That and finding hard wax-like residue instead of liquid in the brake systems of cars that hadn't seen the road in decades leads me to believe the the glycol-fluid condense - that some component of the fluid evaporates. Quote: 2. THe vacuum unit should be SEALED from the MC AND the atmoshere at the mateing point of the cyl/vacuum unit. That is to say, that it should not matter if the MC leaks or does not leak or even if the MC is assembled to the vacuum unit at all. THE VACUUM unit SHOULD NOT LEAK VACUUM AT THAT POINT! PERIOD. Whether the vacuum cylinder leaks at its juncture with the M/C depends on the condition of the seals. BTV or not, tandem master cylinder or not, I wouldn't put much faith in decades old seals.
Posted on: 2009/5/23 21:51
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Re: Treadlrvac???????
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Home away from home
 
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See post #12 of
packardinfo.com/xoops/html/modules/newbb ... orum=2&post_id=29191#forumpost29191 I believe that the person makeing post #12 had the BTV rebuilt by a qualified rebuilder about 1 to 3 years earlier. SO, old or aged seals is not an issue in this particular case.
Posted on: 2009/5/23 21:56
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Treadlrvac???????
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Forum Ambassador
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In that particular case it might not be old seals, but it's possible for a seal to be defective of other reasons.
Still, one could also have a problem with the die-cast master cylinder housing/bore.
Posted on: 2009/5/23 22:03
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Re: Treadlrvac???????
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Home away from home
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"finding hard wax-like residue instead of liquid in the brake systems of cars that hadn't seen the road in decades leads me to believe the the glycol-fluid condense - that some component of the fluid evaporates."
Evaporates to Where???? The only place it can evaporate to is the atmosphere. Seal the reservoir from the atmosphere and that problem is solved. Also, there are those touting the draining and flushing of brake fluid every 1 to 3 years. A reservoir seal would eliminate this. No??
Posted on: 2009/5/23 22:03
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Treadlrvac???????
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Forum Ambassador
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Such a diaphragm might slow down evaporation but what kind of driver doesn't check the brake fluid level or have it checked periodically?
Anyway, I don't believe the rubber is 100% air-tight. Also, it has been reproted that glycol-based fluid can draw mositure out of the air - right through rubber. I've found internal rusting even in modern sealed system. I've seen clubs involved with more modern cars, fitted from the factory with "sealed" braked systems, that DO recommend draining glycol-based fluid, cleaning the M/C reservoir and refilling every couple of years.
Posted on: 2009/5/23 22:11
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Re: Treadlrvac???????
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All of the standard brake fluids (excepting silicone) are hydroscopic to one degree or another and hence they absorb moisture. Even the best of the stuff, perhaps BMW's DOT 4, will do it. Frequent use of the car and heat generated by using the brakes tends to reverse the process, so cars that sit for long periods of time or see little road use will suffer the greatest problems associated with moisture, rust, crystallization and degredation of the fluid components.
Draining and flushing brake fluid every few years is MUCH more important if the car doesn't see regular use. That's really about the only advantage to using a silcone fluid, great for museum cars and the like.
Posted on: 2009/5/23 22:23
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Re: Treadlrvac???????
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Webmaster
 
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On the subject of the 55/56 Manual underfloor MC..... any idea why they decided to move them under the floor? 54 and prior the MC's were mounted forward of the firewall on the framerail behind the steering box. The rear mounting bolt doubles as a Ultramatic linkage pivot point.
Attach file:  (80.89 KB) (76.79 KB)
Posted on: 2009/5/24 14:22
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Treadlrvac???????
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Home away from home
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I would imagine it had something to do with the Torsion Level bars being in the way.
Posted on: 2009/5/24 14:55
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Re: Treadlrvac???????
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Just can't stay away
 
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Ok so someone mentioned they would like to know why others units hve failed.
A far as I can tell mine failed due to the type of clamp used on the vacuum (being the original), meshed with low fluid and tons of that white buildup. Haven't taken it apart, so I haven't seen the rest I the inside, but from what I could tell it hasn't been serviced since the 80's. [Edit] cheanged the clamps to seal the vacuum and added fluid. Now they Works alright now but I'm not satisfied just yet. Not sure what to do about that buildup.
Posted on: 2009/5/26 10:12
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** 1956 Packard Patrician **
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