Second question response.  A "normal" master cylinder in the brake line wont
work as it only has a single pressure line out.  You need a pressure line in
and out of the cylinder. This preserves fluid pressure when "normal" braking
is undertaken.  An "open" fluid reservior would simply fill when you applied
the brakes and your braking system would not retain its pressure to activate
the slave cylinders.
----- Original Message -----
From: "Adam Jackson" <adam@sr51...>
To: <membersozdat@data...>
Sent: Saturday, July 29, 2006 11:31 PM
Subject: Re: hydraulic handbrake master cylinder? what from?


> THanks for the info Richard.
>
> I have a quick question.
>
> Why can't we use a normal clutch or brake master cylinder? Do they back
> feed?
>
> ie setup
>
> Firewall to T-piece
>
> T piece goes rears & to the clucth master cylinder in cabin (hand brake)
>
> When lever pulled in cabin that would actuate the rears. Now would this
> cause the m/c on the firewall to back feed?
>
> I hope this is making sense...
>
>
> ----- Original Message -----
> From: "Richard Clough" <rclough@nets...>
> To: <membersozdat@data...>
> Sent: Monday, July 24, 2006 10:25 PM
> Subject: Re: hydraulic handbrake master cylinder? what from?
>
>
>> Mark
>>
>> A hydraulic handbrake is only used by drivers to lock up or  at least
>> brake loose the rear wheels when they want to go sideways or spin on the
>> spot. Rally drivers regularly need to spin 180 degrees "on the spot" when
>> they over shoot an intersection, or need to turn very hard left or right,
>> and there's not enough wheel lock to do it.  The hydralic handbrake is
>> not used to stop the car.
>>
>> A hydraulic hand brake can be added into the rear brake line system
>> without changing the original mechanical setup.
>>
>> If you dont pull up the hydraulic handbrake lever when braking normally,
>> the fluid pressure to the rear brakes simply flows through the hydraulic
>> master cylinder to the rears, that's why you cant use a master cylinder
>> with a fluid reservoir.
>>
>> When you activate the hydraulic hand brake, you cut off the incomming
>> fluid flow from the normal brake master cylinder to the rears and only
>> the hydraulic handbrake controls the pressure to the rear brakes.
>>
>> ----- Original Message -----
>> From: "mark krawczuk" <krawczuk@dodo...>
>> To: <membersozdat@data...>
>> Sent: Monday, July 24, 2006 9:56 PM
>> Subject: Re: hydraulic handbrake master cylinder? what from?
>>
>>
>>> hi,  it isnt a real  good idea to have a hydraulic handbrake is it ? i
>>> mean the whole idea of a hand brake is in case the hydraulic  system
>>> fails, thats wny u have a mechanical  one  ????
>>>
>>> or am i missing something. ?
>>> mark k
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Richard Clough" <rclough@nets...>
>>> To: <membersozdat@data...>
>>> Sent: Monday, July 24, 2006 9:02 PM
>>> Subject: Re: hydraulic handbrake master cylinder? what from?
>>>
>>>
>>>> Hi
>>>>
>>>> No need to get too specific about master cylinders for hydraulic
>>>> handbrakes.
>>>>
>>>> Basically you want a brake M/C that has a brake pipe screw fitting at
>>>> the entry and exit to the master cyl. These are designed for remote
>>>> fluid reserviors.  Girlock and PBR make them.
>>>>
>>>> Fit it by cutting the line to the rear leaving a generous amount of
>>>> pipe to bend upward through the transmission tunnel and onto the m/cyl.
>>>> outlet. Usually you need to make up a new inlet pipe from the brass
>>>> union fitted on the firewall to the inlet of the handbrake m/cyl., as
>>>> the remaining pipe is too short to reach the inlet side of the m/cyl.
>>>>
>>>> M/C Diameter isnt critical but 3/4 inch would be adequate unless your
>>>> using big rear dual/quad piston calipers. Smaller diameter gives you
>>>> more feel, but this isnt necessary as basically you want to lock up the
>>>> rears to start the car rotating.
>>>>
>>>> Happy handbrake fabricating.
>>>>
>>>> ----- Original Message -----
>>>> From: "Adam Jackson" <adam@sr51...>
>>>> To: <membersozdat@data...>
>>>> Sent: Wednesday, July 19, 2006 9:28 PM
>>>> Subject: hydraulic handbrake master cylinder? what from?
>>>>
>>>>
>>>>> Hi guys,
>>>>>
>>>>> Since there's alot of rally experience/expertise on here, i thought
>>>>> i'd ask what master cylinder a hydraulic handbrake uses?
>>>>>
>>>>> I've heard that early land rover master cylinders are capable of it?
>>>>>
>>>>> What have people used here?
>>>>>
>>>>> cheers,
>>>>> Adam
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>


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