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brake bleeding

Transit Mk3, 4 & 5(smiley front) Forum. All Transits 1986 - 2000

brake bleeding

Postby escort » Fri Jul 27, 2018 9:00 pm

hi all ive got a mk4 long wheelbase camper and im replacing both front calipers and both rear wheel cylinders an shoes so got to bleed the whole sytem
ive bought a sealy one man bleeder that preasurises the sytem using air from a tyre
has anyone used one off these?or got any hints or tips when bleeding the brakes? thanks georg
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Re: brake bleeding

Postby dumper » Sat Jul 28, 2018 8:23 am

Set up as instructions and start at n/s/r then o/s/r then n/s/f then o/s/f you may have to go round more then once .
rule of thumb when bleeding brakes is start furthest away from the master cylinder
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Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
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Re: brake bleeding

Postby Mfr » Sat Jul 28, 2018 12:08 pm

I tried one of those bleeders and I couldn't get it too work. I think that the tyre air pressure is too low to get passed the load actuated valve. I couldn't get any air or fluid to come out the rear cylinders without pressing the brake peddle. I got a passer by in the street to help me bleed em out. :lol:
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Re: brake bleeding

Postby Mislaid » Sat Jul 28, 2018 2:26 pm

Can reduce possible difficulties by replacing one component at a time, then bleed. Start with furthest away

Easybleeds usually work at a maximum of around 20psi, tyre pressure has to be no more or risk damage
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Re: brake bleeding

Postby rebuilder86 » Thu Aug 02, 2018 11:39 am

i have a really dificult brake system on my jungle jeep in the philippines, and i made a little jar with 2 pipes coming out of it, prefectly sealed, and i stick one end on engine vacuum and one on the bleed nipple and suck the fluid through wiht the engine at idle (highest vacum). It is the fastest method ive ever used and works incredibly well because it pulls rather than pushes, so any air that would get in the nipple is sucked out into the jar. OF course u would need to use the vacuum pump if u have a diesel.
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Re: brake bleeding

Postby Islander71 » Mon Aug 06, 2018 2:52 pm

Be a bit careful with the tyre pressure type bleeders - I tried this on an old tractor with 10psi in the tyre. It split the old and brittle fluid reservoir and blew brake fluid everywhere.....
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Re: brake bleeding

Postby V184 » Mon Aug 06, 2018 3:10 pm

loosen the bleed nipples and let it "naturally bleed" then tighten them all & bleed in the order above, Transit master cylinders can be sensitive :? Another way is to back bleed using a clean oil can filled with brake fluid with a tube ,
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Re: brake bleeding

Postby cherniy_chack » Mon Aug 06, 2018 7:09 pm

V184 wrote:loosen the bleed nipples and let it "naturally bleed" then tighten them all

I always do that.
And then I act in a classical way, together with my assistant.
One presses the brake pedal, the other unscrews and twists the nipples on the brake cylinders.
dumper wrote:start furthest away from the master cylinder

A little bit wrong.
You can start with any working cylinder, it is important that it is connected to the first section of the main brake cylinder from the vacuum booster.
rebuilder86 wrote:and i made a little jar with 2 pipes coming out of it, prefectly sealed, and i stick one end on engine vacuum and one on the bleed nipple and suck the fluid through wiht the engine at idle (highest vacum)

Great idea, I will definitely do it.
One remark.
The vacuum created by the vacuum pump on the alternator shaft does not depend on the revolutions and is usually -0.8 atm at all revolutions.
I measured the vaccum with a vacuum gauge.
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Re: brake bleeding

Postby dumper » Mon Aug 06, 2018 7:40 pm

Hi I cherniy_chack I don’t no wear you served your apprenticeship but when I serve mine and done many manafcture brake course and nearly 40 years repairing all manner of vhercals you’re wrong my friend unless you are only changing one part of the brake system the you only need to bleed that component
MK 8 L4 H3 Motorsport campervan
Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
dumper
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Re: brake bleeding

Postby cherniy_chack » Mon Aug 06, 2018 7:58 pm

Hi, dumper.
We can talk about the same thing, but the language barrier prevents us from understanding each other.
I am a living person and I can, no, just have to make mistakes in some matters.
Maybe I am wrong about something in this topic, you pointed out my mistake and other people will not repeat it.
Here I took a video of the measurement of the vacuum created by the vacuum pump of the brake system Transit Mk3.
https://www.youtube.com/watch?v=rpe2-KtsqR0
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Re: brake bleeding

Postby dumper » Tue Aug 07, 2018 7:12 am

Hi cherniy_chack no problem but as for bleeding vehicles with the master cylinder on UK near side yours will be still furthest from the master cylinder and work your way to the nearest when it comes to the computer side of modern vehicles I’m lost but for the nuts and bolts side not a lot has changed since the 70s it’s just how it’s controlled nowadays cheers mate
MK 8 L4 H3 Motorsport campervan
Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
dumper
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Re: brake bleeding

Postby cherniy_chack » Tue Aug 07, 2018 6:25 pm

Hi, dumper.
I wonder where my mistake is.
Point it out, please.
I'll try to fix it.
It's never too late to learn.
The recommendation to start the bleeding of the brake system from the element, which is remote from the master cylinder, starts with single-circuit braking systems.
Two-circuit systems need to start pumping from the first circuit-near to the vacuum amplifier.
Until this circuit is filled, the second circuit is difficult to pump.
Bleeding the brake system = removing air from the brake system.
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Re: brake bleeding

Postby dumper » Wed Aug 08, 2018 6:44 am

Hi mate i allways use that sequence when bleeding the full system say when replacing the brake lines or master cylinder were th system is drained of fluid and the same when just changeing the fluid but if I was changing say the rear cylinders I’d bleed each one as I fitted it even for the different brake circuit splits between fwd and rwd set ups which ever way you bleed it you will get the air out eventually i know sometimes people have had problems getting the system blead using a different sequence and when-they have done it this way they have this way it’s worked as v184 says that’s what I do open up all the bleed nipples and let the fluid find it’s way out of all the nipples before tightening them up and starting the bleeding process it has always worked for me apart from a couple of times when the master cylinder has packed up after draining the system
MK 8 L4 H3 Motorsport campervan
Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
dumper
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Re: brake bleeding

Postby rebuilder86 » Wed Aug 08, 2018 12:02 pm

for me the biggest problem is that the brake bleeders are a long way down, and air wants to travel up, so the two man system only works if you are trying to flush brakes which have no air in them. big air bubbles tend to just head straight on back up where they came from if using the two man system, unless u are incredibly fast and efficient. like lightning fast. realistically, its impossible.
thats why i reccomend the constant suction method from a vacuum source. its simple, and it works better than anything as the air never gets a rest unitl its out of the bleed nipple.
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Re: brake bleeding

Postby dumper » Wed Aug 08, 2018 4:34 pm

Yes the suction ones are a nice pice kit the single man bleeder I have is a small tank that is filled with fluid along with the master cylinder they are connected together with a pipe onto the tank you feed air pressure come a spare tire or in my case a regularlator from my compressor so it pushes fluid from the tank into the master cylinder and through the system as you open each nipple never had a problem with this kit
MK 8 L4 H3 Motorsport campervan
Past camper vans
1974 mk1 v4 with 2.0 pinto fitted
1986 mk3 2.5 di swb
1990 190 lwb 2.5 di
1998 100 lwb 2.5 di
2006 350 jumbo 135 tdci
dumper
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