Brake pedal goes straight to the floor

im have a problem with the Landy ( get the joke's out off the way. Yes the big problem is its a disco and im the driver of it lol )
the brake pedal went straight to the floor
now have a hard pedal with engine off, pedal goes straight to the floor when the engine is running.
So today I put in new brake pads all round
It don't have any leaks. If I pull the vacuum hose off the servo the pedal doesn't drop. Put my finger over the hose and it has good suction. Put it back on the servo pedal goes to the floor.
If I pump the pedal it goes hard again but then goes back down.
I will try bleeding it tomorrow. Just wondered if anyone has any other ideas on what could be wrong with it.

Land rover discovery 1 1996 2.5 diesel

Clamp all four break hoses off and check if it sinks still if not take off one by one till it does, will narrow dowm ur problem

Sounds like a leak on a caliper or joint.

R U losing brake fluid ?
If yes, as suggested it's probably a an external seal or joint somewhere.
If no, it sounds like a mastercylinder internal leak & a servo problem - although both together would be unusual.
Were the brakes perfectly OK before you noticed this ?

Paul

2001 Disco 2 TD5, 171,000 miles & climbing

You see, there are some friendly folk on here...

if it aint loosing fluid it sounds like master cylinder to me.

Hi there. Had exactly the same problem with mine ... fitted new hoses because of the lift I put on mine and bled brakes,still the same .... eventually after bleeding and bleeding and bleeding using about 3 litres of fluid and an eezibleed I've now got a good pedal ... It still creeps down but a lot slower and it dont go to the floor and it passed the MOT and I'm now happy with it

Buell S1 said:

Hi there. Had exactly the same problem with mine ... fitted new hoses because of the lift I put on mine and bled brakes,still the same .... eventually after bleeding and bleeding and bleeding using about 3 litres of fluid and an eezibleed I've now got a good pedal ... It still creeps down but a lot slower and it dont go to the floor and it passed the MOT and I'm now happy with it

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but he hasnt pulled the pipes apart to get air in in the first place

Thanks for the help I bleed the system but still the same then I replaced the m/c then new fluid and bleed it again. it's a little better so I will try bleeding it again at the weekend

ricc said:

but he hasnt pulled the pipes apart to get air in in the first place

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Ok I'm a knob ... should of explained that my brakes were like that when I first got my Disco when it was totally standard, I was hoping it was the old flexi hoses ballooning but after doing the suspension lift etc and fitting new stainless hoses after the initial bleeding it was still the same .... so I just kept bleeding until I got a good pedal - hopes this makes sense lol

Is it doing this when stationary or only after being moved?
If after being moved, it will be a knackered wheel bearing or warped discs which will be pushing the pistons back in as the wheel rotates.

If when stationary too then you have a serious amount of air in the system, or more likely a leak. As said, if fluid isn't leaking then it's the master cylinder. If you are losing fluid then you need to trace the pipes and calipers to find the leak.

phil540uk said:

Is it doing this when stationary or only after being moved?
If after being moved, it will be a knackered wheel bearing or warped discs which will be pushing the pistons back in as the wheel rotates.

If when stationary too then you have a serious amount of air in the system, or more likely a leak. As said, if fluid isn't leaking then it's the master cylinder. If you are losing fluid then you need to trace the pipes and calipers to find the leak.

Click to expand...

I had same problem when my wheel bearings turned to dust. New bearings and now brakes are tip top again

It happens went I'm stationary too. I have check all pipes for leaks and check the flexi pipes ballooning. I fitted a new master cylinder yesurday and its still doing doing it

Is it straight to the floor like there's hardly any pressure in the system or is it that it will slowly creep to the floor as you keep pressure applied to the pedal?

I think its your servo mate mine the same diaphragm split causing air to escape start car and push pedal does it hiss as mine does

@ phil540 the pedal creeps to the floor
@gazmc I can't hear any hissing from the servo even with a small piece of pipe to my ear listening for air leaks on the servo and vacuum pipe

Andytats said:

@ phil540 the pedal creeps to the floor
@gazmc I can't hear any hissing from the servo even with a small piece of pipe to my ear listening for air leaks on the servo and vacuum pipe

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Any signs of leaks under the servo or vacuum pump even down the pedal ?

I have looked but can't see any leaks. I'll try bleeding it again tomorrow if that don't work then I'll fit another servo

Andytats said:

@ phil540 the pedal creeps to the floor

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Could just be diesel creep then? As a diesel engine doesn't generate vacuum, they have a pump which creates the vacuum for the servo. This doesn't stop and as the vacuum is so strong if you leave your foot on the pedal it will overcome the master cylinder seals and let the pedal creep to the floor.

The vacuum pump may be shot. Easy enough to get and fit, but not cheap