Date:         Mon, 17 Dec 2007 21:26:13 -0500
Reply-To:     Mike Collum <collum@VERIZON.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike Collum <collum@VERIZON.NET>
Subject:      Re: Master Cylinder Diagnose
Comments: To: John Goubeaux <john@UCSB.EDU>
In-Reply-To:  <47672E32.4090905@ucsb.edu>
Content-type: text/plain; charset=ISO-8859-1; format=flowed

You've described a classic symptom of a master cylinder that has leaky
internal seals, John.

Mike



John Goubeaux wrote:
> Folks,
>
> Would the Brake Master Cylinder be responsible for the following
> symptoms:  Pedal is hard and there is no pumping needed to stop but if
> pedal remains depressed,  eg such as waiting at a stop light, and
> allowed to move up and down slightly, it will slowly sink to the floor
> over the course of several slight up and down pumps. I have re-done the
> back brakes: drums,  shoes, cylinders,  and they are adjusted and bled.
> I also see no fluid leaks fore or aft.
>
> Someone earlier suggested, as a check on the brake booster, to press the
> pedal and hold and start the engine and confirm that the pedal sinks a
> bit as a confirmation that the booster is working properly. I have done
> this and it behaves accordingly.
>
> It seems pretty evident that the MC is starting to pass pressure, but
> thought I would confirm before I replace another part.
>
> -john
>