RazMan
|
 posted on 15/1/06 at 06:27 PM |
|
|
Is size important? ......... for a brake fluid reservoir :D
I'm just calculating the size of a rather odd shaped brake & clutch fluid reservoir. It needs to be specially made to fit a recess above my
rack and the largest I can make it is just under a litre including airspace. Bearing in mind that it needs to feed both brake and clutch systems, is
it going to be big enough?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
|
|
Johnmor
|
| posted on 15/1/06 at 06:35 PM |
|
|
Fluid reservoir
I have just removed an engine from a vehicle and taken the reservoir out, it fed both clutch and brakes and must only be about 250/300ml in size.
The amount of fluid that is exchanged with each press of a pedal is minimal and only needs to allow for expansion and cornering forces. As the brake
pistons move out and pads wear the fluid is used so if you have large four pot calipers this may be a consideration.
Dont know if that helps!!.
|
|
|
02GF74
|
| posted on 15/1/06 at 07:06 PM |
|
|
you can work out how much fluid is pushed on each brake press.
how many pistons? diameter? how far they move, probably not more than 2 mm and same for rear. Or diameter of master and piston travel?
I'd be surprised more than 50 cc is moved.
You need to allow for fluid to take up wear in brake pads, again mknowing the thickness of friction material gives yop volume; not that it matters
since you wold be topping them up.
I'd guess 300 cc for the master would be sufficient.
(note the word guess appears several times in this post  )
|
|
|
RazMan
|
| posted on 15/1/06 at 08:00 PM |
|
|
Pretty much what I was thinking but it is always a good idea to get a second or third opinion to make sure you are not totally off the rails. 
I reckon, allowing for the airspace above the fluid it will hold a little over 500ml at it's 'min' mark so it should do fine.
As you both said, the amount of fluid movement is minimal.
Before I part with my highly cherished beer vouchers, does anyone know if there are any SVA requirements for a reservoir apart from the obvious level
switch? I am getting one made in stainless - it will have three baffled chambers to supply each m/c individually.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
Mix
|
| posted on 15/1/06 at 09:50 PM |
|
|
I think one of us may have missed the point here
The reservoir is there to provide a source of fluid to compensate for pad / disc wear and leakage.
Once the system is bled depressing the pedal will only compress fluid downstream of the master cylinder, the fluid in the reservoir plays no part in
the braking or clutch action.
Mick
[Edited on 15/1/06 by Mix]
|
|
|
RazMan
|
| posted on 15/1/06 at 09:58 PM |
|
|
quote:
Originally posted by Mix
I think one of us may have missed the point here
...the fluid in the master cylinder plays no part in the braking or clutch action.
Mick
That might be a typo but the fluid in the master cylinder is surely crucial to the braking action - the reservoir is only there to top up the m/c when
it needs it (when your foot comes off the pedal and a miniscule amount of fluid flows in to compensate for pad wear.
I just want to make sure that I have an adequate amount of fluid to compensate for cornering & braking forces, to prevent air entering the system
[Edited on 15-1-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
omega 24 v6
|
| posted on 15/1/06 at 10:04 PM |
|
|
Bear in mind that the bigger the reservoir, then there are more pumps of the pedal available, if a pipe or hose bursts and you need to keep pumping to
acheive an albeit minimalized braking effort.
|
|
|
Mix
|
| posted on 15/1/06 at 10:08 PM |
|
|
Bugger 
Mick
|
|
|
02GF74
|
| posted on 16/1/06 at 09:56 AM |
|
|
quote:
Originally posted by Mix
I think one of us may have missed the point here
The reservoir is there to provide a source of fluid to compensate for pad / disc wear and leakage.
Once the system is bled depressing the pedal will only compress fluid downstream of the master cylinder, the fluid in the reservoir plays no part in
the braking or clutch action.
Mick
[Edited on 15/1/06 by Mix]
you are correct; the large volume is to compensate for pad/shoe wear but the level has to drop when brakes are applied; you want to ensure it does not
drop so far as to let air in.
to origianl poste: how come you are having this problem fitting an off the shelf master cylinder/reservoir?
|
|
|
NS Dev
|
| posted on 16/1/06 at 10:20 AM |
|
|
he's not, he's looking at fitting a bespoke reservoir now.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
|
|
|
RazMan
|
| posted on 16/1/06 at 02:40 PM |
|
|
quote:
Originally posted by 02GF74
to origianl post: how come you are having this problem fitting an off the shelf master cylinder/reservoir?
I simply can't find a space in which I can mount it 'elegantly' Sure, I can plonk it on a bracket somewhere but I want it to look
right as well. The custom combo tank just solves an asthetic issue while helplng to duct air away from the rad and up through the bonnet vent.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
|
|
|
