From: Chris Whelan on
On Tue, 29 Jun 2010 19:01:40 +0100, Mrcheerful wrote:

[...]

> fluid change
> works out at about 30 p per week. (30 quid every two years) you could
> save that by driving more economically!!

The average driver should be able to save 75 quid a year by more
economical driving!

Chris

--
Remove prejudice to reply.
From: Bob Dodds on
On 29 June, 19:09, Chris Whelan <cawhe...(a)prejudicentlworld.com>
wrote:
> On Tue, 29 Jun 2010 19:01:40 +0100, Mrcheerful wrote:
>
> [...]
>
> > fluid change
> > works out at about 30 p per week. (30 quid every two years) you could
> > save that by driving more economically!!
>
> The average driver should be able to save 75 quid a year by more
> economical driving!
>
> Chris
>
> --
> Remove prejudice to reply.

I've heard and read about hydraulic fluid absorbing moisture from the
air many times but the bit that always puzzles me is the hydraulics
are a sealed system so how does the oil come into contact with the air/
moisture. Yes there is a breather in the top of of the reservoir but
that has a rubber seal that only lifts slightly to account for
pressure differentials. So again how does the oil in the pipes and
pistons absorb this moisture?

Bob
From: Paul on
On 29/06/2010 20:32, Bob Dodds wrote:
> On 29 June, 19:09, Chris Whelan<cawhe...(a)prejudicentlworld.com>
> wrote:
>> On Tue, 29 Jun 2010 19:01:40 +0100, Mrcheerful wrote:
>>
>> [...]
>>
>>> fluid change
>>> works out at about 30 p per week. (30 quid every two years) you could
>>> save that by driving more economically!!
>>
>> The average driver should be able to save 75 quid a year by more
>> economical driving!
>>
>> Chris
>>
>> --
>> Remove prejudice to reply.
>
> I've heard and read about hydraulic fluid absorbing moisture from the
> air many times but the bit that always puzzles me is the hydraulics
> are a sealed system so how does the oil come into contact with the air/
> moisture. Yes there is a breather in the top of of the reservoir but
> that has a rubber seal that only lifts slightly to account for
> pressure differentials. So again how does the oil in the pipes and
> pistons absorb this moisture?
>
> Bob

And the stuff in the reservoir in theory never gets used, as its there
to replace any lost by a leak...
From: Duncan Wood on
On Tue, 29 Jun 2010 20:32:14 +0100, Bob Dodds <13013dodds(a)gmail.com> wrote:

> On 29 June, 19:09, Chris Whelan <cawhe...(a)prejudicentlworld.com>
> wrote:
>> On Tue, 29 Jun 2010 19:01:40 +0100, Mrcheerful wrote:
>>
>> [...]
>>
>> > fluid change
>> > works out at about 30 p per week. (30 quid every two years) you could
>> > save that by driving more economically!!
>>
>> The average driver should be able to save 75 quid a year by more
>> economical driving!
>>
>> Chris
>>
>> --
>> Remove prejudice to reply.
>
> I've heard and read about hydraulic fluid absorbing moisture from the
> air many times but the bit that always puzzles me is the hydraulics
> are a sealed system so how does the oil come into contact with the air/
> moisture. Yes there is a breather in the top of of the reservoir but
> that has a rubber seal that only lifts slightly to account for
> pressure differentials. So again how does the oil in the pipes and
> pistons absorb this moisture?
>
> Bob

It doesn't need very much and biderinal moving seals are rarely proof
against both directions, every time something cools down there's a tiny
negative pressure in the system.

--
Duncan Wood
From: Duncan Wood on
On Tue, 29 Jun 2010 20:36:04 +0100, Paul <paul23232(a)hotmail.com> wrote:

> On 29/06/2010 20:32, Bob Dodds wrote:
>> On 29 June, 19:09, Chris Whelan<cawhe...(a)prejudicentlworld.com>
>> wrote:
>>> On Tue, 29 Jun 2010 19:01:40 +0100, Mrcheerful wrote:
>>>
>>> [...]
>>>
>>>> fluid change
>>>> works out at about 30 p per week. (30 quid every two years) you could
>>>> save that by driving more economically!!
>>>
>>> The average driver should be able to save 75 quid a year by more
>>> economical driving!
>>>
>>> Chris
>>>
>>> --
>>> Remove prejudice to reply.
>>
>> I've heard and read about hydraulic fluid absorbing moisture from the
>> air many times but the bit that always puzzles me is the hydraulics
>> are a sealed system so how does the oil come into contact with the air/
>> moisture. Yes there is a breather in the top of of the reservoir but
>> that has a rubber seal that only lifts slightly to account for
>> pressure differentials. So again how does the oil in the pipes and
>> pistons absorb this moisture?
>>
>> Bob
>
> And the stuff in the reservoir in theory never gets used, as its there
> to replace any lost by a leak...

And the slack caused by the frictional bits wearing.
--
Duncan Wood