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-   -   brake pressure fade (http://www.clubcobra.com/forums/australian-cobra-club/120448-brake-pressure-fade.html)

sideshow 05-05-2013 03:13 PM
20 years of working on cars u sometimes run into problems with bleeding brakes and I remember some days u spend half a day getting a good pedal on a customers car
It wrecks your brain trying to figure out what could be wrong

Zedn 05-05-2013 09:51 PM
Quote:
Originally Posted by AC-460 (Post 1242769)
your displacements are incorrect...... Your problem is what you first suggested.... if you don't have a dual master cylinder setup eg one for front one for rear with a balance bar and you are relying on a single master cylinder your displacements are wrong eg your rears are locking up because your master cylinder has supplied more fluid to the rear than the front..... you need to fit a proportioning valve to bleed off pressure to the rears.... or reduce the piston size of the calipers on the front..... or increase the piston size of the calipers on the rear
The setup he has is tried and tested in many cobras. There may be variations, under actual braking but that would be due to weight distribution. If at full brake he can turn the wheel by hand then there is a problem with this set up that works on other cars.

renovationinnov 05-06-2013 03:15 AM
as said before i found that the calapers when i took pics where fitted the wrong hand when i reassembled them i did it again '' so now i have swapped them & today ive got the new brake lines so i'm at the misses mercy to help bleed again
tried to find a vaccum bleed system today but no one stocks them there order in only so ill buy a one man bled system tomorrow then
if the problem persists ill try all that has been suggested
let you all know soon thanks
ROB

Jaydee 05-06-2013 03:26 AM
Quote:
or increase the piston size of the calipers on the rear
Increasing the piston, means larger surface area, means more force is applied to piston. Larger piston in master cylinder is more fluid, less pressure.
JD

Zedn 05-06-2013 05:07 AM
i got a one man bleeder for about $15 from super cheap. It is a hose with a one way valve on it so you hook it up and just pump.

AC-460 05-07-2013 03:28 AM
Quote:
Originally Posted by Zedn (Post 1242888)
i got a one man bleeder for about $15 from super cheap. It is a hose with a one way valve on it so you hook it up and just pump.
What about the air drawing in through the thread on the bleeder?????

Legless 05-07-2013 05:01 PM
Quote:
Originally Posted by AC-460 (Post 1242987)
What about the air drawing in through the thread on the bleeder?????
Though slightly different, this is also the problem with vacuum bleeders I reckon, while they have a use I still think there's no substitute for pushing the brake peddle.

Gav 05-07-2013 06:46 PM
With a vacuum bleeder it won't matter if it sucks a bit through the bleeder thread.
I reckon you are clutching at straws thinking that was an issue.
I found the vac' bleeder to work well with any brake system.

renovationinnov 05-12-2013 04:19 PM
well people I have had success I bleeding , after a few leaks [ retightened all connections we have brakes
I bought a self bleeder unit & a one way valve from repco which failed
tried super cheap [ name says it all ] which failed
so Sunday flee market found a old workshop unit $24 , cleaned it up & wolar brakes
thanks for all the incites
ROB

renovationinnov 05-13-2013 02:29 AM
just an up date i got home ready to put the wheel on & sit it on them but all i found was brake fluid every where
a brake hose had broken at the crimp flange thread [ jag bought ]factory hoses
so just ordered new stainless steel ones
back to the start again
ro


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