[TR] TR2/TR3 Brake Problem

[Tony Drews]

Just to amplify Randall's comments - if the piston can't return to 
the very bottom of its stroke in the master cylinder, it blocks the 
hole allowing the pressure to be released from the wheels.  If it's 
close, the problem can be very intermittent.  If the rod between the 
brake pedal and the master cylinder can be shortened a little, try 
that.  Make sure the pedal doesn't bind, etc.  Anything that prevents 
the return to the bottom will be a problem.  I'm not fully versed 
in  the TR2 specific master cylinder, but all master cylinders 
operate similarly.

In a related story, my dad (uncle jack) had a 52 chevy pickup where 
this problem occurred.  It turned out that the relief hole which 
allows the pressure release was not drilled all the way 
through.  Truck had that issue from new.

Regards, Tony

At 11:27 AM 9/19/2016, Randall wrote:
> > I'd appreciate any thoughts you guys might have on the problem especially
> > "been there, done that" experiences.
>
>My guess, the return valve inside the MC is not opening, for whatever
>reason.  Might be a misadjusted pushrod/pedal stop; could be the pedal
>hanging up (binding), or even a missing pedal spring.  With the valve
>closed, normal expansion as the fluid heats up can apply the brakes.
>
>When it happened on my Stag, the MC piston was binding in the bore just
>enough to keep it from returning far enough to open the valve.  (Apparently
>some gorilla had used vise grips on the piston and not bothered to even file
>away the damage afterwards.)  Loosening the line at the MC and letting out
>just a few drops of fluid got the brakes to release (proving it was a MC
>problem) and we drove another 300 miles or so without any further problem.
>
>-- Randall
>
>
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