Hard Brakes??

hoopfish · Mar 18, 2013

Ok then,i have just replaced front callipers,disks,pads.Rear pads and disks and replaced all brake lines.I have bled all of the old fluid and replaced with new!.
The problem i have is that after hitting the brakes hard,which work pretty well,if i push the pedal again straight away they go hard and give very little braking.The last couple of days when i start the old girl the brake pedal is solid for a few seconds then returns to normal.
It is a Disco1 300tdi auto.
Im thinking master cylinder but could it be something else,servo etc?

Looking forward to any advice.....well nearly any advice,sure i will get some thats not so helpfull

Regards
Terry.

landowner · Mar 18, 2013

Check for leaks on the Vacuum side if things, maybe the vac pump

uncle albert · Mar 18, 2013

landowner said:
Check for leaks on the Vacuum side if things, maybe the vac pump

+1 air leak prob.

landowner · Mar 18, 2013

Check that you havn't dislodged the vac pipe from the servo like I did when doing mine

hoopfish · Mar 18, 2013

So are we thinking that the master cylinder is not likely to be at blame here?
Thanks for your replys.

uncle albert · Mar 18, 2013

hoopfish said:
So are we thinking that the master cylinder is not likely to be at blame here?
Thanks for your replys.

correct ,

thats the thinking . its prob.the least likely cause of your symptoms

hoopfish · Mar 18, 2013

uncle albert said:
correct , thats the thinking . its prob.the least likely cause of your symptoms

So im looking for the hose on the check valve?

jai_landrover · Mar 18, 2013

the one way valve in the servo and the hose to engine if it has a hole in it your getting no or very little assistance

uncle albert · Mar 18, 2013

suggest start at servo and work back will prob find small pipe t`s off to heater (I think) this is prone to perish/crack , but check all jionts

hoopfish · Mar 18, 2013

Yet again,thanks for all your help i will get looking when i finish work tomorrow
and report back with findings!.

hoopfish · Mar 19, 2013

Right i have checked the hoses which appear to be ok but when i pulled the hose off of the check valve i found oil in the in it,is this normal?
The pedal only goes hard when first started or idling in traffic,at low revs,im thinking that somwhere a seal has gone or i have a hole.Any ideas on other places to check?
Regards
Terry.

Soloby Rob · Mar 19, 2013

I'm thinking vac pump knackered.

hoopfish · Mar 19, 2013

Soloby Rob said:
I'm thinking vac pump knackered.

Im thinking along those lines,oil in the pipe,normal or not?

uncle albert · Mar 19, 2013

hoopfish said:
Im thinking along those lines,oil in the pipe,normal or not?

dont think so , none in mine.

Soloby Rob · Mar 19, 2013

hoopfish said:
Im thinking along those lines,oil in the pipe,normal or not?

Not really, take the pipe out of the servo (the plaggy bit is easily broken) start engine and put you thumb over pipe, it should quickly build up a vacuum.

hoopfish · Mar 19, 2013

Soloby Rob said:
Not really, take the pipe out of the servo (the plaggy bit is easily broken) start engine and put you thumb over pipe, it should quickly build up a vacuum.

So should suck on to my thumb?

hoopfish · Mar 19, 2013

uncle albert said:
dont think so , none in mine.

Didnt think it should have,any idea how oil is getting in to it?

Soloby Rob · Mar 19, 2013

hoopfish said:
So should suck on to my thumb?

If you want :baby::baby::hysterically_laughi Sorry, can't resist. Yes it should suck quite hard and quickly on yer thumb.

hoopfish · Mar 19, 2013

Soloby Rob said:
If you want :baby::baby::hysterically_laughi Sorry, can't resist. Yes it should suck quite hard and quickly on yer thumb.

Soloby do you think this is somoething nigs could sort out for me?
:hysterically_laughi rofl

hoopfish · Mar 20, 2013

Took the pipe off and put my hand on the end of it,stuck to my hand.
I dropped the rubber in to the vacuum servo unit,fished it back out with a bit of wire and discovered about 3 inches of oil in the bottom?

Hard Brakes??

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