Brake pedal goes straight to the floor

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Andytats

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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
 
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
 
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
Click to expand...


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
Click to expand...
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?
 
@ 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
Click to expand...

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
Click to expand...

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.
 
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