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Re: More Questions on C Brakes

Subject: Re: More Questions on C Brakes
Date: Fri, 14 May 1999 11:09:52 EDT
In a message dated 5/14/99 10:12:40 AM Eastern Daylight Time, 

<< I am not moving
 fluid from the M/C throughout the system by pushing the pedal
 or with the force of air from an ez bled kit.  It is as if it
 is jammed from the M/C out.  Could be M/ C be bad, and if so
 how can I check it out? >>

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This sounds like you have a main brake line crimped closed.  Hydraulic fluid 
is non-compressable so the pedal will be solid if there is no place for the 
fluid to go.

Take the MC out, put it in a bench vise with a few rags wrapped around it, 
and push in the piston with a screwdriver.  If fluid flows out the line 
holes, the MC is fine.  If you can't push in the piston, the MC is jammed and 
is causing the problem.  My guess is that it is okay.

Next, check the condition of the brake lines.  (Not the flex hoses.)  See if 
they are bent or crimped anywhere.  You may have to check each one 
individually by removing both ends and forcing air through it.  If air gets 
thru, the line is open.

My Midget has a pressure switch, which lights the brake light if it senses 
more pressure on one side of the brakes on the dual line system.  That is the 
first place the fluid goes after the MC, so if it's jammed, the brakes won't 
work.  Make sure that all the brake components are working properly.  I'm not 
as familiar with the C.

A word of caution when trying to remove the brake lines or flex hoses, use a 
flare wrench to prevent damage to the fittings.  If they haven't been off for 
many years, soak them with PB Blaster first.  I did this on my '77 Midget and 
only damaged one fitting.  They were all very tight.  (I was replacing all 
the lines anyway, so I wasn't being very careful.)

Are you replacing the flex hoses?  If they are old and hard to remove, they 
should be replaced.  They can swell INSIDE where you can't see it, and that 
will bind up your brakes.

Keep us posted.

Allen Hefner
'77 Midget
'92 Mitsubishi Expo LRV Sport

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