[Healeys] Brake Problems Continue

[Michael Salter]

I would suggest that a little diagnosis would be worth the trouble here.
The master cylinder is only a very simple pump. As someone mentioned if the
level in the reservoir rises as you push the pedal the head seal in the
master cylinder is leaking probably because it is installed incorrectly.
If that is OK try gently clamping off all the brake flex lines and then
seeing if you get pressure on the pedal, which you most certainly will.
Pressing on the pedal with the clamps on should result in no dropping of the
pedal. If it does look for leaks upstream of the clamps.
Next get good pressure on the pedal and have someone remove the clamps one
at a time. The one, or more, which results in a large drop of the pedal will

Indicate which brake or brakes have the problems.
The most common thing on 100s and 100/6s is incorrectly arced shoes which
bend as pressure is applied resulting in a soft pedal.
Michael Salter
http://www.netbug.net/blogmichael/?p=445

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Mark LaPierre
Sent: Wednesday, August 26, 2009 8:11 PM
To: WILLYS49 at aol.com; Healeys at autox.team.net
Subject: Re: [Healeys] Brake Problems Continue

Some time ago it was mentioned on the list to put the hand brake on so the 
shoes or shoe is hard against
the drum,  then bleed the rears.    Worked for me.


Mark


----- Original Message ----- 
From: <WILLYS49 at aol.com>
To: <Healeys at autox.team.net>
Sent: Wednesday, August 26, 2009 3:31 PM
Subject: [Healeys] Brake Problems Continue


>I still cannot get brake pressure on my '59 100-6. I have replaced just
> about everything (mc, wheel cylinders, brake shoes, all hoses and rear 
> brake
> lines. I do have a few clues that might help. Before I replaced the rear 
> brake
> lines and hose, I pinched off the old brake hose and felt pressure on 
> brake
> peddle. After I replaced rear hose and the two rear brake lines that I
> thought might be leaking, I bled all the air out of lines. Still no luck. 
> Peddle
> immediately goes to floor. Takes about three pumps to feel pressure and
> holds but immediately goes to floor with no pressure when released.
>
> I know that the new rear brake shoes are about half the thickness of the
> originals and the adjustment cam doesn't seem provide much resistance on 
> drum.
> If the brake drums are worn and shoes are thin, could that be the cause of
> problem? I'm running out of ideas and parts to replace (not to mention
> summer is coming to an end).
>
> Any thoughts or advice appreciated.
>
> Eric
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