Brake problem

[lionatus]

Pipes burst friday and managed to get home topping up the reservoir with fluid.
Took to garage and we ran new brake pipes and bled all 4 sides succesfully but no pressure on pedal. My mate who was pumping the pedal for me whilest we bled the brakes said he thought he got a blip of pressure about 2/3rds of the pedal travel but no real pressure at all. Any ideas?

When I got to garage I had no pressure either and only got a stop from maybe 2mph at the very bottom of the pedal.

[lionatus]

No one? To reiterate I have no brake pedal when engine off but have replaced brake lines and have bled all 4 calipers. Still no pressure on pedal?

[COLVERT]

Providing there are no leaks anywhere the only answer, really, is that you still have air in the system.----

There is, I believe, a correct order that has to be followed when bleeding them.--

[lionatus]

Bleed procedure was followed a few times but still no pressure on pedal. Wouldn't be the master?

Originally Posted by COLVERT

Providing there are no leaks anywhere the only answer, really, is that you still have air in the system.----

There is, I believe, a correct order that has to be followed when bleeding them.--

[clf]

Originally Posted by lionatus

No one? To reiterate I have no brake pedal when engine off but have replaced brake lines and have bled all 4 calipers. Still no pressure on pedal?

As far as I understand, you won't have vacuum with the engine off. Pump the pedal 2 or 3 times and any residual vacuum pressure remaining will be used and pedal will become solid.

I may be wrong, but there should be a vacuum pump to produce vacuum, so if you have no pedal with the engine running, then I would start with that.

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[COLVERT]

Originally Posted by clf

As far as I understand, you won't have vacuum with the engine off. Pump the pedal 2 or 3 times and any residual vacuum pressure remaining will be used and pedal will become solid.

I may be wrong, but there should be a vacuum pump to produce vacuum, so if you have no pedal with the engine running, then I would start with that.

Sent from my SM-A600FN using Tapatalk

The thing is that the OP said the pedal went to the bottom.

Vacuum or not that shouldn't happen I reckon.--

[lionatus]

Engines never been on during whole process. We got pipes off after finding the massive blow out looked like a flared pipe already. Reran new lines attached airtight, tested as airtight during bleeding, no air from calipers but still no peddle. No pressure at all apart from the 2/3rd travel blip. There is a broken bleed nipple on 1st caliper thought so we took it off, expelled fluid and retested same result. I'm not going to have to plus gas, and hammer the old broken bleed nipple am I? I should still just have a spongy but pressured peddle for the minute amount of air that might be left because of this? I thought the ABS was on the 2ndary circuit so it shouldn't affect the actual pad operation or am I over-simplifying?

Originally Posted by COLVERT

The thing is that the OP said the pedal went to the bottom.

Vacuum or not that shouldn't happen I reckon.--

[clf]

what is creating the vacuum? On a diesel, if the engine is off, and you have filled the system, and it is sealed, then there will be no pedal travel after a couple of pumps, until you either start the engine, or open a nipple. (I thought petrols was the same). Or are you saying that the pedal is solid even with the nipple open?

[lionatus]

We cant understand it either. Pedals has no pressure at all. I didn't feel the blip personally as I was under the car bleeding. You know the score, pump, pump, pump, fluid comes with no air bubbles then you shout pedal down and tighten that corner off and move to the next. After all 4 corners done still no pressure.All with engine off, suggests air leak but we checked that at the unions and the pipes are all new copper.

Originally Posted by clf

what is creating the vacuum? On a diesel, if the engine is off, and you have filled the system, and it is sealed, then there will be no pedal travel after a couple of pumps, until you either start the engine, or open a nipple. (I thought petrols was the same). Or are you saying that the pedal is solid even with the nipple open?

[lionatus]

Id also have thought vacuum pipes too but that only kicks in when engines running. I haven't checked them though, they were fine the last time I checked last summer after replacing the bracket, but until the initial systems is ok whats the point.

Originally Posted by clf

what is creating the vacuum? On a diesel, if the engine is off, and you have filled the system, and it is sealed, then there will be no pedal travel after a couple of pumps, until you either start the engine, or open a nipple. (I thought petrols was the same). Or are you saying that the pedal is solid even with the nipple open?