No brake pressure when car started

[r2m2u]

I have replaced master cylinder and booster and bled about four litres of brake fluid through lines
There are no leaks the fluid doesn't drop in the reservoir, It builds pressure with engine of and soon as its started it drops to the floor when pressed and sounds like someone letting of wind , There is no resistance at all ,

 

[h701micra]

Either you need to bleed it again or your brake pipes are ballooning

 

[frank]

were they new or 2nd hand parts ?

 

[r2m2u]

were they new or 2nd hand parts ?

Its not down to bleeding ive done about four bottles of dot 4 on it ,,, ive checked vacuum hose and all parts where taken of a working car i know they worked fine as it was me that tried them out then removed, the car has been lieing for a year and it lay there getting stuff done to it ,,
Im at the end of my tether with it its the final job before it goes for paint and im stressed , thanks for your replies
How can i test for ballooning its not building any pressure at all and abs light on .

 

[Enuo]

Get someone to press the brakes with car on axle stands and engine running and see look at the hoses.

 

[r2m2u]

Get someone to press the brakes with car on axle stands and engine running and see look at the hoses.

If there where balloning the the fluid would drop would it not .

 

[frank]

maybe the pushrod is too far out or in ? i recall one member needing spacers to position the pushrod against the m/c accurately, causing the valving in the m/c to malfunction.
we have a similar problem on our karts, where the piston inside the m/c has to fully retract in order for the fluid to flow into it properly

 

[Enuo]

Yeah, until you take your foot off the pedal and it returns to the reservoir.

 

[r2m2u]

i did notice that when i put m/c on it just bolted on no pushing or anything ...is the rod not far out enough

 

[r2m2u]

Yeah, until you take your foot off the pedal and it returns to the reservoir.

the drawing it back in would make sense ,

 

[h701micra]

Basically I'd say exactly what Enuo is saying

 

[r2m2u]

Right if thats the general opinion thats what im looking for tomorrow . How common is balloning brake pipes

 

[frank]

. How common is balloning brake pipes

i,ve never come across it, but seen many people struggle to get a "pedal" after fitting a m/c tho
if it was balloning the pedal would be springy

 

[r2m2u]

Right no spring either ,,, how about the rod needing adjusted

 

[chris b]

U vacuum pipe must be off ur servo

 

[r2m2u]

U vacuum pipe must be off ur servo

vacuum pipe fully attached and on the right way .

 

[h701micra]

Right no spring either ,,, how about the rod needing adjusted

By no spring what do you mean?

 

[r2m2u]

By no spring what do you mean?

just goes down to the floor and doesnt return with any pressure or spring

 

[Enuo]

just goes down to the floor and doesnt return with any pressure or spring

But you're not losing fluid?

 

[h701micra]

just goes down to the floor and doesnt return with any pressure or spring

So you must be losing fluid? Or no spring in master cylinder? Or missing your spring on the pedal?

 

[r2m2u]

no lose of fluid at all

 

[h701micra]

no lose of fluid at all

And the pedal doesn't return at all?

 

[r2m2u]

just goes down to the floor with no pressure and a wooshing noise , this is third m/c if tried and second booster , im thinking its something else

 

[r2m2u]

And the pedal doesn't return at all?

pedal returns but not with any force ,,

 

[h701micra]

just goes down to the floor with no pressure and a wooshing noise , this is third m/c if tried and second booster , im thinking its something else

Its definitely a dodgy brake pipe.. if you can hear the fluid moving.
I had the exact same a couple of months back. I changed both servo and m/c.. same symptoms..

 

[r2m2u]

did you have the exact symptoms as this ...how to i know what one it is ...is it a rubber pipe/hose

 

[h701micra]

did you have the exact symptoms as this ...how to i know what one it is ...is it a rubber pipe/hose

I certainly did. And it frustrated me as my pipes were new.
It will be a rubber pipe. They age and weaken

As said before... jack it up. Engine running. Have someone keep pressing the pedal and check each pipe individually

 

[r2m2u]

and that would lose all pressure , ive read it but didnt think it would be so severe .

 

[Enuo]

and that would lose all pressure , ive read it but didnt think it would be so severe .

If the hoses are burst you'll lose fluid, if they've just lost their strength they'll bulge outward.

 

[h701micra]

and that would lose all pressure , ive read it but didnt think it would be so severe .

I had a bit of pressure with car off... turn engine on... instant pedal to floor

 

[h701micra]

For what its worth.. replace them all.
And for the cost of new rubber ones you may aswel buy braided ones

 

[r2m2u]

im getting a hard pedal with car off after a few pushes , engine turned on i get zero instantly ,

 

[h701micra]

im getting a hard pedal with car off after a few pushes , engine turned on i get zero instantly ,

Exactly the same as me then
Bulging pipes

 

[Enuo]

im getting a hard pedal with car off after a few pushes , engine turned on i get zero instantly ,

the servo works off vacuum, with the engine off there is no vacuum so the servo isn't there to help you push down.

 

[h701micra]

Try these
item.mobileweb.ebay.co.uk/viewitem?itemId=121211352629

 

[r2m2u]

im gonna change the pipes, grease the calipers ,,,,and if all this fails im going to stand and scratch my balls

 

[h701micra]

Do it

 

[r2m2u]

thats what im going to do , micra c-c 1.6 sport with no brakes isnt much good . thanks gents ill let you know how it goes .

 

[h701micra]

thats what im going to do , micra c-c 1.6 sport with no brakes isnt much good . thanks gents ill let you know how it goes .

Cool. That link I gave you may be wrong for a K12

Keep us informed

 

[r-reg-sr]

here have a k11 one too
http://www.micra.org.uk/threads/why-didint-i-listen-to.47828/#post-494115

 

[Paul Smith]

Could this be caused by air trapped in the abs module. If air is in there its not coming out. Just a theory

 

[chris b]

Check vacuum pipe going on2 sirvo

 

[h701micra]

Check vacuum pipe going on2 sirvo

No need it already works

 

[Enuo]

Check vacuum pipe going on2 sirvo

If vacuum pipe was broken then the pedal wouldn't drop further when the engine switched on.