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jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8032

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Hazards flashing after brake input? How?

2010MY 130 2.4

i was adjusting the piston length on the 130 over the weekend to take out some of the slack in the pedal.

On assembly i slightly misaligned the piston into the master cylinder.

on pressing the pedal, which was rock solid as expected, that was until the piston slipped across into the recess in the MC.

At that point, there was a jump in the vehicle as the brake system was shocked and the hazards came on.

Not come across this feature on the Puma before.

they go off with an ignition cycle. (engine was running at time). turning hazards button on/off or indicators didnt turn it off, so a separate feed to the hazard module had been actuated.

i am presuming the sudden change in brake pressure initiated it? but how? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

6th Apr 2021 8:39pm

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3676

It is pretty common in “modern” cars to flash the hazards automatically under heavy breaking. Wasn’t aware if it in a defender thigh but it might be the case that there is a pressure switch being triggered somewhere.

7th Apr 2021 5:05am

Dinnu

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

2012 Defender 90 Puma 2.2 CSW Santorini Black

Never seen any pressure switch on the brake lines. Defenders are still old design. The brake light switch is under the dash, there is a plastic cover protruding where the fuse box / obd port is located.
Unsure if the ones with ABS have anything though.
Does the hazard or the indicators trigger anything else? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

7th Apr 2021 5:21am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17386

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

There is no evidence on anything like this on any of the electrical diagrams for the vehicle, and the only thing I can think of is that it is a feature (probably unintentional) of the alarm system. There is no way that anything connected with the brakes could activate the normal hazard flasher circuitry, but a sudden shock could activate the alarm. However the alarm should not have been activatable (if such a word exists) with the engine running, so something unexpected has happened. Very bizarre, and probably unplanned.

7th Apr 2021 8:30am

dorsetsmith

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

https://www.defender2.net/forum/post641377.html

7th Apr 2021 11:13am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2005

^^^^^^^^
That’s a very informative link DorsetSmith. I never knew their was an inertia switch on the 10AS alarm module for vehicles with central locking.

7th Apr 2021 11:29am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8032

Ok, well symptons suggest its part of the alarm then ready attached link. Guess it picked up a large inertia shock..

Doors wouldn't lock on fob at that point either. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

7th Apr 2021 11:39am

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