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Re: Brake bias/proportion?

To: "S." "L." Hower <howersl@ttown.apci.com>, mgs@Autox.Team.Net
Subject: Re: Brake bias/proportion?
From: Paul Hunt <on76@dial.pipex.com>
Date: Tue, 18 Feb 97 20:06:04 GMT
> 
> 
>   Ok, I have a braking problem that I havent been able to sort out.
>   I have an idea of what *might* be wrong, but I wanted to bounce the
>   problem past the list before I run off any buy new parts.
>   
>   Here are the facts:
> 
>    73 MGB, dual circuit brake system, rebuilt calipers, rebuilt master
>    cylinder (both rebuilt by me), new wheel cylinders, new brake lines, 
>    hoses, pads and shoes.  All components were replaced or rebuilt.
>    I am using DOT5 brake fluid (silicone).   
> 
>   Here are the symptoms:
>    
>    After driving for about 10 mins, both calipers begin to drag, the
>    pressure differential warning light turns on (and remains on) and
>    eventually the front brakes grab- you can smell the pads heating up.
>    
>    If I let the car sit for about 15 mins, the P-D-W goes out and the 
>    process repeats again.  The pedal is always firm; and there are no
>    obvious leaks, although I have noticed a tiny spot of fluid on the 
>    drivers floor mat, (about the size of a quarter).  I attributed
>    this to a loose fitting (or a drip from the pedal box due to a sloppy 
>    filler :-)   
> 
>    I know what you are thinking-  no, I am not driving the car on 
>    public streets like this; these are just test runs on private
>    property.  Also, the rubber brake hoses are *not* collapsed,
>    I could gravity feed new fluid through them when I installed
>    them a few months ago. 
> 
>    I suspect that the master cylinder is not distributing fluid to 
>    the rear circuit; but I am not sure how this could cause the 
>    front brakes to bind- I would have expected the front to work
>    fine, but the rear to not work at all.  Any ideas??  
> 
>    --Scott
> 
>    Scott Hower  --> howersl@ttown.apci.com      
>    Air Products & Chemicals, Inc.       
>    7201 Hamilton Blvd Trexlertown, PA    
>    (610) 481-2646                        
> 
> 
> 

I have read elsewhere that the pedal linkage on a rebuilt system can stop the 
master cylinder piston coming back far enough to allow pressure in the line to 
release into the reservoir.  Could the fluid be heating up, expanding, and 
pushing the pad on because the pressure can't escape?


PaulH
73 Roadster (HD&H)
75 V8 (DD)


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