mlf HELP

[roadrunner]

Hi just bleeding brakes new calipers and master cylinder and am having big big trouble bleeding them, i have fluid at all 4 disks but sill cant get a peddle, i did have brakes when i got the car but cant get them now, any ideas, ive read all the posts on brakes and have been trying to bleed these for 3 days now, tried pressure bleeding ,pumping gravity and nothing works,   does anybody no the correct lenghth of the master cylinder rod from pedal to master cylinder this is my last hope b4  i dont no what??

[Rusty's Uncle]

You say all four discs so do you have disc brakes all round ?

[roadrunner]

yeah disks all round they were all working, not great but worked now 3 days and 3 litres later still nothing

[Rusty's Uncle]

Ok , not sure about the rears but if you have cinquecento calipers on the front and they are mounted in the "4 O'clock" position, as they need to be, then you will have trouble bleeding the brakes if the car is on a level surface as there will be a trapped air pocket in the caliper. Parking on a decent down slope or jacking up the back of the car can solve this when bleeding. Whatever set up you have check out the position of the bleed nipple in relation to the piston pot cos those old air bubbles will only go up 

[fixit]

what i normally do in this situation is have a cuppa x choccy biscuit for strength
then
get some, well 3 brake pipe grips, put on each rubber pipe near calipers bleed the caliper that is not gripped unto the peddle is right then work round the car removing and replacing the grips
hopefully this will give you a pedal
lack of pressure could be one of the joints is leaking pressure perhaps a copper washer?
but it could be the master cylinder seals are worn but id try the above first
hope this helps
regards fixit

[roadrunner]

Well i tried all that rusty said, i took all the calipers off and put a piece of wood in each and had half a pedal,put calipers back on and no pedal,my master cylinder is brand new none of the calipers are leaking as i put 1 bar through them on a pressure bleeder ,,,i will tr the clamps tomorrow

[ChrisRLewis]

Perhaps your master cylinder requires a "Bench Bleed" 

[roadrunner]

Well been out in garage another couple of hours tried brake pinchers in all locations bled again and no pedal, but with the 3 clamps on full pedal im now very confused and holding a sledge hammer,brake clamps on front brakes full pedal take off no pedal hellllllllllllllllllllppppppppp

[fixit]

right the back ones now bled, move onto the next till good pedal,
 it takes some time using this method but hopefully it will work and it will help to identify the corner that's giving you bother


the grips / clamps stop the fluid from reaching the calipers so only one is moving which is why your getting good pedal once bled

hope this helps explain regards fixit
 

[roadrunner]

Ok ive had a pedal a full pedal with the bleed nipples on the front facing 12 oclock but as soon as i bolt back in the 4 oclock position peddle is on the floor..

[126partssupl]

There is no disc breaks in 126

[roadrunner]

There is no disc breaks in 126

there is on my one 

[Pete126]

Perhaps your master cylinder requires a "Bench Bleed" 

I had a similar problem when i replaced the Master Cylinder, but i bled the M/C on the car, undo the outlet pipes on the master cyl" get someone to press the pedal down slowly until fluid squirts out then nip them up, bleed the fronts immediately. you might want to put cardboard under the front to catch the fluid