[Healeys] Brake issue

[Michael Salter]

As I recall Roger found that after using silicone brake fluid there was a
certain degree of swelling of the master cylinder seals, including the so
called  "recuperating seat". As a consequence of this the "recuperating"
passage to reservoir was not opening up when the piston was fully extended.
Going from memory Roger found that it was necessary to machine the master
cylinder body to provide more space for the recuperating seat and shim
washer.

The article was published in at least one of the national club mags.

I would think that the uncertainty of materials used in current seal sets
and brake fluids could very easily cause any seal to swell with similar
consequences.

M

On Sun, Jul 28, 2019 at 12:09 PM Michael Oritt <michael.oritt at gmail.com>
wrote:

> Michael--
>
> Do you remember the issue and/or can you point me toward it and its
> possible resolution?
>
> Best--Michael Oritt
>
> On Sun, Jul 28, 2019 at 10:11 AM Michael Salter <michaelsalter at gmail.com>
> wrote:
>
>> Regarding pushrod free play.
>> Unfortunately the known problem with 100 master cylinders is internal to
>> the cylinder itself and is not resolved by ensuring that the push rod has
>> free play.
>> Roger Moment wrote an excellent, and of course exhaustive,  article on
>> the subject many years back after he encountered difficulties when using
>> silicon fluid.
>>
>> M
>>
>> On Sun, Jul 28, 2019, 9:42 AM warthodson--- via Healeys, <
>> healeys at autox.team.net> wrote:
>>
>>> I still suspect the lack of proper free play in the brake pedal & this
>>> is the easiest to check. Simply adjust the free play, temporarily, such
>>> that there is excessive free play & go for a test drive.
>>> Gary H
>>>
>>>
>>> -----Original Message-----
>>> From: Michael Oritt <michael.oritt at gmail.com>
>>> To: Kees Oudesluijs <coudesluijs at chello.nl>
>>>
>>> Kees--
>>>
>>> That is about the procedure I envisioned following.
>>>
>>> Since there has never been any pulling to one side I doubt the failure
>>> is at one particular corner, but the hoses are at least 15 years old and
>>> deserve replacement.  I replaced the MC innards with a kit a year or so ago
>>> but will go through it again and replace as necessary.  I'll also flush the
>>> system thoroughly.
>>>
>>> Best--Michael Oritt
>>>
>>> On Sun, Jul 28, 2019 at 8:39 AM Kees Oudesluijs <coudesluijs at chello.nl>
>>> wrote:
>>>
>>> Go through each component one by one. Start with new brake hoses if they
>>> are still the old fashioned rubber/textile construction. How old are they
>>> by the way? Probably decades so renewal was probably well overdue. Also
>>> flush the entire brake system with fresh brake fluid as there may be some
>>> debris in it somewhere.  Try again and if solved it may well have been
>>> collapsed inner wall of one or both of the tubes. If not solved adjust the
>>> rod on the MBC. Still not solved, renew or overhaul the MBC and adjust the
>>> rod.
>>> When rebuilding brake components do NOT use clean brake fluid but the
>>> special brake grease from Até, Girling or equivalent.
>>> Overheating is unlikely as that will generally lead to complete loss of
>>> brakes.
>>> Kees Oudesluijs
>>>
>>>
>>>
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