IListers, hello;
I have been following the interesting Brake threads that often come up
here;
So here are my experiences regarding the pumping of the brake pedal and
other brake situations..
I therefore add my 2 cents.
1]
There could be a situation where a wheel cylinder was slowly, not a fast
leak , but slowly leaking... and therefore you would - Lose Pressure when
you needed to apply the brakes.
However, pumping the pedal seems to have worked "somewhat" at the time
until the leak suddenly and or eventually, became excessive. There was
always the telltale wet or drip at the backing plate.
However, this was not "always" instantly viewable.
2]
Another thought is that the Master cylinder has a slow leak in it rubber
seal/cup .., then pumping the pedal gives you a "seemingly" higher pedal. It
works too.
Some years back, I had one that took about 20 seconds to get to the floor.
When, as a young fool I thought life would go on forever... and that this
Master Cylinder would last forever too !
Silly me, eh ?
However, I did get a many months of this until the pedal would drop far to
quickly for my liking.
3]
The other situation is when everything is out of adjustment - well worn -
or well in need of adjustment - and then the pedal travel would seem to be
also "excessive" In one push of the pedal there is not enough oil to push
all slave cylinders out far enough for good braking. Therefore a few quick
pumps would give more oil to the wheel cylinders. This pupumping would need
to be very rapid though ?
If you happen to pump too slowly, the oil would draw back into the Master
Cylinder as per normal. No apparent pedal height would be achieved.
The last problem is where the brakes seem to be jammed on very slightly -
once the pedal is released.
I have found that this is the begining of a slave cylinder piston freeze.
This can be very slight at first. Not even a noticeable telltale smell of a
hot rubbing brake shoe. But it does get worse and the car seems to roll to a
stop more abruptly. Eventually I jack up the car to see which slave cylinder
is starting to freeze. Also, gently test the wheel hub area and you may
easily detect just which one is too warm when comapred to the other 3 wheel
hubs/drums.
Watch out though. the drums can become extremely hot all around !
Finally, whenever I rebuild brakes I make my own pipes and use the ever
competent Flare tool.
A great investment.
I always, always, always, use Never Sieze on ALL threads The salt in the
north east just kills that Little Bleader screw and I have had them snap
off - trying to remove them.
So, bleeding becomes impossible !
What should have been a one wheel job for a leaking slave cylinder - turns
out to be a 4 wheel job due to frozen air bleeders.
I also use copius amounts of Never Sieze on all exhaust pipes and manifold
nuts and wheel nuts. Oh, don't be a Nay Sayer, thinking that an oily
graphite product on a wheel nut will somehow make them easily undo and fall
off all by themselves.
If you have salt on your roads then eventually you'll have a rusted nut
that will break .
Rob P.
some CJs and a couple MBs
Just a small flock that I shepard in Upstate NY
----- Original Message -----
From: "David Hoelzeman" <mathman@cswnet.com>
To: <WillysTech@yahoogroups.com>
Sent: Tuesday, November 06, 2001 11:15 PM
Subject: Re: [WT] re: brake question
> On Tue, 06 Nov 2001 20:33:49 -0700, John Worman wrote:
>
> >Isn't that just backwards? I always bleed a system to remove air when
> >you have to pump up the brakes. If they are out of adjustment no amount
> >of pumping will bring up the pedal. At least it was always that way for
> >me.
>
> Back when my dad drove my truck on a daily basis (well, it was his at that
time) he would
> have to pump the brakes 3-5 times to get a solid pedal. There wasn't air
in the lines, just
> everything was worn out. Drum was worn, shoes were worn, and adjusters at
their maximum. He
> drove it that way for years.
>
> David
> '50 4WD Pickup
> '51 Parts Truck
>
>
>
>
>
> Visit The Flat Fender Jeep Gallery
> http://www.willystech.com/Flatfender_Jeep_Gallery
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This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 00:36:58 PST