RE: Master Cylinder Acting Up

["Vath, Michael J." <mjvath@xxxx>]

Happy Friday. Fluid movement is affected by restrictions in the line -- or problems with mechanical movement. After looking for kinked/rotten line, Spot check one or two of the wheel cylinder / brake shoe / return spring setups. Look for free movement of the brake shoes across the backing plate; without restrictions in the seating/pivot recesses of the adjuster plates. Look for any evidence of improper brake shoe steel contact with the drum. Look also for weak/broken/missing return springs. Those stout little springs exert a bunch of force that should easily push fluid back into the master. The shoes and springs should definitely not wiggle. Verify that your brakes aren't adjust too tight against the drums (wheels spin somewhat freely).

Other stuff: Peer under your dash and drip a little oil on the brake pedal pivot bolts. The brake pedal should move back out easily. Check for over-eager tightening at the pivot bolts.

If new steel lines have been installed, its possible small shavings (from the inside flare) could be jambed in the fittings; restricting flow.

Within the master & wheel cylinders, the rubber cups could have been installed wrong -- or contaminated to cause distortion of the seals. This usually just causes leaks, and would be unlikely to stop fluid return unless a whole bunch of junk accumulated in them.

The spring within the master must be present. Its usually not very strong, allowing easy movement of the piston prior to adding fluid to the system. If an NOS master -- or a rebuilt unit sits too long, rust might also stop easy movement. 
Thats all from me. Have a great weekend. mv 


-----Original Message-----
From: Mark Souders [mailto:souders@xxxx]
Sent: Friday, May 09, 2003 7:00 AM
To: 'Frank Bakanau'; chrysler
Subject: RE: [Chrysler300] Master Cylinder Acting Up


Hi,
I have the exact same problem with my H. It's supposed to be an NOS master
cylinder, that means it's over 40 years old. I'm thinking it must be
replaced.

Mark Souders


> -----Original Message-----
> From:	Frank Bakanau [SMTP:FBAKANAU@xxxx]
> Sent:	Thursday, May 08, 2003 8:24 PM
> To:	chrysler
> Subject:	[Chrysler300] Master Cylinder Acting Up
> 
> I've replaced the wheel cylinders on my C-300 and flushed the system and
> replaced the fluid with silicone type. (I like the silicone brake fluid
> cuzz it does not absorb moisture which we have a lot of here on Oregon.)
> But after I drive the car a bit, the petal gets very hard, the brakes drag
> and the stop lights stay on. Hmmm.... So I just crack the fitting loose on
> the master cylinder, I get squirt of fluid and all is fine for a while.
> I
> suspect it's a check valve problem in the master cylinder, but before I go
> tearing into it, anyone have sage advice?
> 
> Frank
> 
> 
> 
> 
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