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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5161

United Kingdom 
rear brakes locking on
What the hell could be causing this?
the fools who put my dads defender back together, decided to replace the brake master cylinder, for some right old reason. Funny thing is, my dad already replaced that a couple of years ago, and its had new rear brakes, due to it failing the MOT, 3 years ago. Also we fitted a vented setup to it, not long after the rear brakes. I got him the setup for his xmas box, so all was ok, until this lot who have put it back together and replaced the brake master cylinder. My mam had a close one, with it. My dad had to bleed the rears, so they would free off, and its just happened again there, on monday. Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #1048250 10th Oct 2024 2:55pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I had this with my old Lada Niva. All four corners locked up while driving along. Turned out, the pushrod from the pedal to the master cylinder needed the free play adjusting.
The pushrod was just gentle pressing enough to make the brakes come on 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1048253 10th Oct 2024 3:01pm
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ickle



Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1777

France 2008 Defender 110 Puma 2.4 CSW Alpine White
is there a front to rear balance valve on your truck?

Keith
Post #1048255 10th Oct 2024 3:06pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5161

United Kingdom 
laugh is we have not had a look yet Thumbs Up they did remove the brake pipes, well cut them off, when they did the rebuild.
i will mention the brake pedal thing too. Thumbs Up Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #1048258 10th Oct 2024 3:24pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17362

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
AS noted above the most common cause of the brakes not releasing is the push-rod from the pedal to the MC being adjusted so that it is too long, this prevents fluid from being able to return to the reservoir.

IN the case of a Defender (with dual circuit brakes) it is possible for only one circuit to lock on, and I suspect this is what is happening to yours.

When, many years ago, I collected a SI I had just bought I had this problem and ended up immobile on the A4 in Beaconsfield in a thoroughly nasty spot. I had to let fluid out of the bleed nipple to release the brakes, drive to a place of safety and then adjust the push-rod.
Post #1048260 10th Oct 2024 3:26pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5161

United Kingdom 
ickle wrote:
is there a front to rear balance valve on your truck?

Keith


i am starting to suspect something like that is missing on my dads
https://www.defender2.net/forum/topic83668...cing+valve Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #1048371 11th Oct 2024 2:08pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
What is in that thread is a G Valve. As the name implies, its a mechanical valve that senses G force when the Landrover is involved in a collision and shuts off the hydraulic line. It is not a pressure reducer. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #1048429 12th Oct 2024 7:03am
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