Chrysler Repair: Chrysler T&C Master Cylinder Issue, rear brakes, master valve

Question
Back in late February, I had the rear brakes done along with the master cylider replaced.  A few days later, I noticed the the brake peddle became very spongy, went to the floor, and the van did not want to stop.  Furthermore, as it did slow down, it pulled to the right hand side.

I took it to a different shop.  They replaced the front brakes and rotors, and bled the brakes.  They informed me that there was more air in my brakes than they had ever seen, particularly the left side.  After this, the van was good for a short while.

Again, the same symptoms occured.  Mushy peddle, not stopping, pulling to the right, and even the ABS kicking on as I slid to a stop.  The brakes were bled again, and I was told that if it happens again, it would be the master cylinder.

2 other times this happened, and each time, something different was replaced.  First, the mechanic that did the master cylinder said that it was a caliper sucking in air.  The caliper was replaced and i happened again.  The other day, they replaced the brake hose, and yet still....

Today, I felt around the master cylinder and noticed that there was fluid on the underside of it.  The reservoir is still full (so it appears).  Does this seem indicative of a faulty/defective master cylinder as the one mechanic stated?  It seems that the shop that replaced it sure hasn't entertained the notion that they may have installed a dud.

Answer
Hi Stephen,
If there is fluid on the underside of the cylinder in the engine compartment then that might indicate a loose fitting of a brake line connection to the master cylinder, a loose fitting of the reservoir to the master cylinder, or an overfilled reservoir that temporarily spilled. I would wipe off the master cylinder and see if it gets wet again after driving it for a day or so.
If the wetness is in the cabin where the master valve stem exits from the cylinder and is then attached to the brake pedal, then that would be a sign of a leaking master cylinder proper.
So wipe it up wherever it is and see exactly where it is coming from. If you have a further question be sure to tell me the year of the vehicle.
Roland
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