Dave Massey wrote:
It also conceivable that the PO (previous owner) had been in the master
cylinder and had left out the floating piston. In order to make this
work
he would have to plug the port to the smaller reservoir. This is
consistent with your symptoms. But there can be a less sinister cause.
Just keep in mind just how important your brakes are.
Good Luck
Dave
This was the possibility suggested by TRF/Dave. The PO, who is a nice
guy, may have been unaware of this and it was simply rebuilt (which it
appears to have been) be an incompetent person or company.
Well, it is starting to look like a fairly large rebuild of the entire
brake system is in order. I'm not sure how far I will have to go and
will most likely do it in two parts with the MC coming first and
foremost.
Dave, if I understood you correctly, then the front plunger in the MC
could be the culprit, if it even exists, as to the cause of my problems.
And since the front brakes do most of the work this makes sense.
However, unless I'm overlooking something, it also appears that my rear
brakes were actually working but simply being supplied with brake fluid
from the front reservoir.
TR6's are supposed to have two independent braking systems, but I
believe I had in effect one system. This was working fine, but if I had
any problemsm with the MC that would cause the front brakes to go then I
would go from 4 brakes to NO brakes in a heartbeat. And a quick
hearbeat that would be.
Lucky that I cought it now.
Now about that additional 100 hp.....
R. Ashford Little II
www.geocities.com/ralittle2
-----Original Message-----
From: Dave Massey [mailto:105671.471@compuserve.com]
Sent: Monday, February 18, 2002 7:27 PM
To: R. Ashford Little II
Cc: 'Dave Massey'; 'Randall Young'; 'Triumphs@autox. Net'; '[unknown]'
Subject: RE: Please HELP with brake bleeding problem
Message text written by "R. Ashford Little II"
>I've done some investigating and am only further confused (my wife
would
>argue this is a permanent state of mind).
Mine says the same about me.
>1. I took the DPWA switch off and looked at the piston and you really
>can't tell much since the hole is so small.
You need a good light and look for a reduced diameter in the plunger.
But
leave that for now.
>2. I disconnected the brake pipe at the reservoir for the rear brakes
>(small res) and fluid flowed out when the pedal was pumped. This fluid
>however depleted the front brake reservoir and yes the pipes aren't
>switched.
The master cylinder is constructed as a duplex device that has a main
piston that operates in the Front Brake portion fo the bore. There is
also
a floating piston that separates the front brakes and rear brakes
portions.
When you step on the brake pedal you push the first piston that dies
several things. 1) it closes the tipping valve closing off access to the
reservoir, 2) creates pressure causing brake fluid to flow to the front
calipers and 3) creates pressure causing the floating piston to move and
3A) close off the reservoir and 3B) create pressure to cause fluid to
flow
to the rear wheel cylinders.
The floating piston serves as an interface between the two circuits. If
the rubber cup were to allow fluid to pass then you can get flow from
the
front brake reservoir to the rear brake circuit. If this is the case
then
your master cylinder needs attention.
>3. I disconnected the inboard pipe from the DPWA and fluid also flowed
>from that hole as well and it was also front brake fluid.
>
>At no time have I been able to drain or deplete the fluid level for the
>rear brakes.
Another reason to service the master cylinder
>Initially I though that the DPWA might be the culprit, but I can see no
>logical reason for front disc fluid to flow out of the hole directly
>below the rear drum reservoir or for front disc fluid to flow out of
the
>rear drum DPWA hole.
Exactly!
>If the master is bad, then why would fluid flow out of the rear DPWA
>hole in the DPWA?
The fault at the master cylinder doesn't prevent fluid flowing out of
the
rear brake circuit. The fault is internal and determines from whence
the
fluid comes.
>Hmmmm? And to think I only started out to change the four brake
>lines....
Better to catch it now than on the road.
It also concievable that the PO (previous owner) had been in the master
cylinder and had left out the floating piston. In order to make this
work
he would have to plug the port to the smaller reservoir. This is
consistent with yoru symptoms. But there can be a less sinister cause.
Just keep in mind just how important your brakes are.
Good Luck
Dave
/// triumphs@autox.team.net mailing list
/// To unsubscribe send a plain text message to majordomo@autox.team.net
/// with nothing in it but
///
/// unsubscribe triumphs
///
/// or try http://www.team.net/cgi-bin/majorcool
|