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 [mailto:dmallin@attglobal.net]
> Sent: Wednesday, October 02, 2002 8:15 PM
> To: mgs@autox.team.net
> 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
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