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Davidarnol

Member Since: 04 Aug 2017
Location: Scotland
Posts: 21

Strange brake issue with 02' Defender TD5 hard top

I have a weird issue with the Brakes on my 2002 TD5 Defender which were working well until recently, pedal then went all the way to the floor before any braking applied, no leaks, pipes / hoses ok, no loss of fluid at master cylinder, bled brakes and everything was fine for a while then same happened again, I changed out the master cylinder, bled the brakes and every thing was ok again, now the same thing has happened again, pedal goes almost all the way to the floor before brakes are applied, still no leaks or loss of fluid, does anyone have any ideas about a potential cause?

4th Aug 2017 3:24pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

try pumping brake pedal with engine running and see if problem stop next
re bleeding brake may be air in system still
start with rear passenger side

4th Aug 2017 3:51pm

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Wheelbearing play can also cause a deeper brake pedal after a longer drive without braking. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

4th Aug 2017 7:39pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2147

Your servo working?

Test by car off, foot hard on the brake, start car. If it depresses then it works.

The servo can also crack where the master fits causing it to draw in air!

+1 on wheel bearing

4th Aug 2017 7:41pm

Davidarnol

Member Since: 04 Aug 2017
Location: Scotland
Posts: 21

Thanks for the suggestions, With engine off the brake pedal goes almost all the way in before brakes are applied, starting the engine at that point makes no difference to the pedal, no sign of a crack around the master cylinder, (I thought that would make the pedal go solid) bearings are ok,
I will try pressure bleeding tomorrow, Just in case,

4th Aug 2017 8:31pm

VeeTee

Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512

Internal leak in the master cylinder - but why would it cure after bleeding?

Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite

4th Aug 2017 9:13pm

Davidarnol

Member Since: 04 Aug 2017
Location: Scotland
Posts: 21

The TD5 master cylinder has 3 pipes coming out of it, two front port pipes lead to the front calipers and the rear pipe leads to the back axle where it splits to supply the rear calipers
The rear brake pipe connection at the master cylinder holds pressure when the brake is applied but seems to allow air back into the master cylinder when the brake pedal is released, so everything works ok after bleeding but the master cylinder soon ends up with air in it again, that is my theory anyway, (air is always at the master cylinder, never down at the wheels!) I will change the pipe out to confirm, has anyone heard of a brake pipe union only leaking in one direction??

6th Aug 2017 11:45am

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