Losing brakes

[Bren]

Hi all,
When I come to a stop and hold my foot on the brakes, the pedal slowly goes to the floor unless I give them another pump. Does this mean redoing the rubbers in the master cylinder, as it is not holding pressure? or could it be something else?
Cheers
Bren

[procrastination inc]

is the fluid level in the reservoir going down?

Puddles of fluid on the ground or wet at the wheels?

popped brake hose could ruin your day when the reservoir runs dry...

[jimbo110]

If you can't see any leaks, it will be the master cylinder.

[Bren]

Thanks, I'll check for leaks, while I am doing the service tomorrow.
Cheers

[simonl8353]

Hi all,
When I come to a stop and hold my foot on the brakes, the pedal slowly goes to the floor unless I give them another pump. Does this mean redoing the rubbers in the master cylinder, as it is not holding pressure? or could it be something else?
Cheers
Bren

Mine does the same. I do feel a little uncertain about the brake pedal travel, but it still passed a RWC, got a brief mention by the RACV inspection (before I bought the car) and is still the same after a brake overhaul to primarily renew all 4 brake discs. Not a mention of any poor braking performance from the mechanic when I picked up the car and I told him to spare no expence!!

I assumed it was standard pedal performance from a Disco, maybe I'm wrong.

[Blknight.aus]

this is caused by the hardening of the primary seal in either the primary section (front brakes) or the secondary section (rear brakes) of the master cylinder, It allows a little fluid to pass back into the next bit of the master cylinder and on the way it returns to the resivior via the supply port for that section.

It will not go away and will only get worse... when it gets bad enough you will loose the braking effort to that set of brakes, the brake pressure differential switch will trip and you will get a brake warning light come on on the dash.

[Pedro_The_Swift]

Mine does the same. I do feel a little uncertain about the brake pedal travel, but it still passed a RWC, got a brief mention by the RACV inspection (before I bought the car) and is still the same after a brake overhaul to primarily renew all 4 brake discs. Not a mention of any poor braking performance from the mechanic when I picked up the car and I told him to spare no expence!!

I assumed it was standard pedal performance from a Disco, maybe I'm wrong.

NOPE!
while the D2 pedal is quite soft, it still never goes past "that" point,,
when you fix the seals, go find a nice dirt road and get the ABS to operate,, this will demonstrate the amount of "feel" built into the soft pedal,, and show you the extended braking distance on dirt roads.
When I first got my D2 I was fortunate to be able to compare all these things with my D1.
The D1 pedal is a brick wall by comparison

[simonl8353]

Ok.
The ABS works fine on dirt (when I tested it last week) and bitumen (as required in an emergency by my better half this week).

Think I'll go and get the seals changed before it degrades. Major thanks for the advice.

[Bren]

Checked for leaks and funny enough the front right hose was leaking. Pretty bad actually. Replaced it today and works well.
Thanks again.

[Freestyler]

I had the problem with my fathers 110. If you were to hold firm pressure on the pedal it was fine but if you only wanted a little the pedal would slowly go to the floor. I found the master cylinder rubbers to be well warn but the cylinder was pitted and needs a stainless liner. Luckilly I had a 110 master cylinder spare.