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Re: Brake advise needed

To: MG List <>
Subject: Re: Brake advise needed
From: Max Heim <>
Date: Thu, 03 Oct 2002 10:40:34 -0700
Ok, I give up -- what's a PDWA?

Pressure Differential Warning A_____?

on 10/3/02 9:03 AM, Dodd, Kelvin at wrote:

> Don:
> The most likely culprit for the empty reservoir are failed seals on the rear
> wheel cylinders.  This is typical if the car has sat for some time.
> Filling the reservoir is not enough to allow the brakes to pump back up.
> All the air must be bled out of the system.  Then they will pump back up if
> the seals hold.  
> If the car has sat for a number of years, I would recomend replacing all the
> seals in the brake system as they don't like sitting.  Don't try to cut
> corners with the brakes.
> The PDWA assembly is a very simple device and is easy to repair, IF the
> supplied kit fits it.  There are a number of different designs, if the
> piston has O rings, the kit will repair it.  If however the piston has cup
> seals, there is no kit available and the only suggestion is to get a used
> unit which can be kitted.
> So far, I've found no rhyme or reason as to which units come in which cars.
> Hope this helps
> Kelvin.
>> -----Original Message-----
>> From: Don Malling []
>> Sent: Wednesday, October 02, 2002 8:15 PM
>> To:
>> Subject: Brake advise needed
>> My 73 MGB has been off the road for several years.
>> The brake pedal had been firm until a few weeks ago, and then
>> it went to
>> the floor -- no resistance at all. The reservoir was empty. I
>> filled it
>> up, and still no pedal.
>> It appears that a small amount of brake fluid is coming out of the
>> switch on the PDWA. Would failed seals in the PDWA switch be
>> consistent
>> with these symptoms?
>> Can the PDWA typically be rebuilt? Moss has them for $399.95 (wow).
>> Rebuild kits are $6.00 to $16.00 depending on the commission number.
>> Anyplace to get rebuilt ones if the kit doesn't work?
>> Thanks, 
>> Don Malling


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires

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