M

muddylane

Member
Hi everybody A little disconcerting!, could i be experiencing pad knock off? on start up all seems fine, but say after a couple of kilometers with the need to use the brakes the pedal seems long! but seems normal after the first application as this is a very new purchase for me, some advice from the more experienced menbers would be very much apreciated
please keep up the good work that the forum is providing
 
Which car?

If I've got this correct you're saying that the first time that you press the brake pedal it goes down a long way but if you let it up and press it again it doesn't go so far down.

If this is correct then this could be air in the brake system.
First check for any leaks.
If you don't find any then you need to bleed the brake system.
For this you need to read RAVE (the workshop instructions) to get the correct procedure.
 
Are the wheel bearings good?
knackered ones, or loose hubs can create that brake effect.
Need to know the car tho
 
Thank you for your responce so far yes i did forget to state the model it is a range rover 4.6 hse 1995, just to add the pedal does not go to the floor or even close there seems to be just a little to much free play before you feel the brakes working,
 
Did you ever fix this? Mine does the same thing - first use of the brake in the morning, pedal travel is significantly more than usual. Then works perfectly every time after that...

Cheers,

Jerry
 
Hello I have a S/H pump/ accumulator to fit as a first measure,
does yours have a clic" in the pedal linkage as you apply the brake?

Brian
 
Yes, a very slight click (I can feel it, not hear it) but only the first time I apply the brakes after the car has been standing for a while, otherwise brakes feel great.

Have you just been living with the problem since July? Has it got any worse??

Also, rereading your original post - do you get the problem only after driving for a short distance, or is it always the first time you use the brakes after the car has been sitting a while?

Cheers

Jerry



Cheers,

Jerry
 
jerrytlr said:
Yes, a very slight click (I can feel it, not hear it) but only the first time I apply the brakes after the car has been standing for a while, otherwise brakes feel great.

Have you just been living with the problem since July? Has it got any worse??

Also, rereading your original post - do you get the problem only after driving for a short distance, or is it always the first time you use the brakes after the car has been sitting a while?

Cheers

Jerry



Cheers,

Jerry
Click to expand...

Can you hear the brake pump running every time you brake? if so the accumulator is shot. As for the "click" that could be a sign of impending total brake failure. Do a search, it's been well reported that 2 plastic discs in the brake modulator fail. An Aussi guy does replacements in stailess steel. You will find details on www.rangerovers.net as well as on LZ.:eek:
 
Hi Everybody
Just thought that i would post an update , Following another of my postings i have just replaced all of the old steel brake lines with copper also the flexibles, after bleeding the braking system(it takes a while) I now have excellent brakes with no CLICK in the first part ofthe pedal travel and no long pedal for the first application,(Idid buy a s/h pump /accumalator but now have this as a spare

brian
 
muddylane said:
Hi Everybody
Just thought that i would post an update , Following another of my postings i have just replaced all of the old steel brake lines with copper also the flexibles, after bleeding the braking system(it takes a while) I now have excellent brakes with no CLICK in the first part ofthe pedal travel and no long pedal for the first application,(Idid buy a s/h pump /accumalator but now have this as a spare

brian
Click to expand...

Good one with the follow up - if just all would do that:)
 
I have a follow-up question on this matter. I was complaining of having a "long pedal" break as well, the dealer changed the accumulator and changed the break fluid, everything then went better. But 1000km later it seems that the problem is back. And indeed I can hear the pump making noise (each time not sure on this) after I break. The pump is not noisy but if you break the first time, then long pump on it break like hell.

Does this mean that I also have a broken pump?
 
Last edited:
SpacePig said:
I have a follow-up question on this matter. I was complaining of having a "long pedal" break as well, the dealer changed the accumulator and changed the break fluid, everything then went better. But 1000km later it seems that the problem is back. And indeed I can hear the pump making noise each time after I break. The pump is not noisy but if you break the first time, then long pump on it break like hell.

Does this mean that I also have a broken pump?
Click to expand...

If the pump comes on after every brake application your new accumulator is duff. There is a method of checking nitrogen charge in it. If your local dealer has the pressure gauge to do it.
 
Hi
I think that it may be a good idea to check very carefully all of your brake lines, mine wre the original steel and very badley corroded, especially at thr rear were they turn thro 90 degree to pass across the car, I believe maybe there was a very small pinhole that was letting in some air, before i noticed the leak of brake fluid, anyone any further thoughts on this?

Brian
 
The Accumulator has a service life (not sure how long mind) but like everything, will eventualy wear out and need replacing.
 
The accumulator contains a bladder or diaphragm pre charged at one side with nitrogen to 80 bars. Fluid is pumped into it against the pressure behind the diaphragm or in the bladder to give a usable reserve of pressurised fluid for the braking system to use, as it is used it is replenished by the pump. If the nitrogen leaks out into the system you will get a spongy pedal. Also there will be no reserve of pressurised fluid for the brake system to use. So the pump will run on each application of the brakes. You should be able to apply the brakes several times before the pump needs to start, to replenish the accumulator.
 
wammers said:
The accumulator contains a bladder or diaphragm pre charged at one side with nitrogen to 80 bars. Fluid is pumped into it against the pressure behind the diaphragm or in the bladder to give a usable reserve of pressurised fluid for the braking system to use, as it is used it is replenished by the pump. If the nitrogen leaks out into the system you will get a spongy pedal. Also there will be no reserve of pressurised fluid for the brake system to use. So the pump will run on each application of the brakes. You should be able to apply the brakes several times before the pump needs to start, to replenish the accumulator.
Click to expand...

I will check this again with the garage, but meanwhile will try to check how many breaks I needs before hearing this pump. I heard around 30 to 40 breaks action before the pump have to activate itself, it is correct or not?
 
I fitted a new accumulator and I hear it pump every half a dozen or so presses. This is probably on the low side but at the moment I have sharp and rapid braking so leaving it to see how it goes. 30 / 40 sounds a bit unrealistic to me, unless someone knows different.
 
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