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Handbrake not releasing preventing engine starting
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Wolfpack
 


Member Since: 28 Jul 2014
Location: Norfolk
Posts: 121

England 2012 Discovery 4 3.0 TDV6 XS Auto Orkney GreyDiscovery 4
Handbrake not releasing preventing engine starting

I’ve had a couple of incidents in the last month when my Disco 4 MY12 refused to start. I found that the foot brake pedal was rock solid such that it wouldn’t allow the engine to start or release the handbrake.

Is this a known problem? Is it exacerbated by the hot weather?

Today I had to really pressed down hard on the rigid pedal ....and engine started.

I’ve stopped using the handbrake for now...in case one day I can’t get it to release.

Suggestions, thoughts please
  
Post #19614098th Jul 2018 6:36 pm
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Bodsy
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Member Since: 06 Nov 2006
Location: In the Clubhouse
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United Kingdom 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Nothing to do with the park brake, just the peddle not moving enough to trigger the release solenoid to get it out of Park/release the brake. As soon as you start the car, the peddle goes down I assume? So then the brake can be released as it’s the same mechanism that is stopping it from starting (I.e. the brake peddle switch not moving enough)
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Post #19614158th Jul 2018 6:46 pm
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Wolfpack
 


Member Since: 28 Jul 2014
Location: Norfolk
Posts: 121

England 2012 Discovery 4 3.0 TDV6 XS Auto Orkney GreyDiscovery 4

Ordinarily, yes the pedal goes down. But on these occasions the pedal itself seems rigid with no movement. As a result it will not allow the car to start or the handbrake to be removed....which ever comes first.

It feels like the pedal is jammed.
  
Post #19614498th Jul 2018 8:57 pm
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2079

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Sounds like the servo loosing all its vacuum, pedal will then go solid, although I am surprised there isn't enough movement to operate the switch to allow the car to start.
  
Post #19614618th Jul 2018 9:15 pm
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Browny90
 


Member Since: 19 Jul 2016
Location: Ashbourne
Posts: 686

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Santorini BlackDiscovery 4

Have your kids been in the car? Rolling with laughter

The first thing my lad does when he get in the drivers seat is to pump the brake pedal.. although even then, I've never had an issue with starting..
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Post #19615569th Jul 2018 9:46 am
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Erea
 


Member Since: 19 Mar 2012
Location: Munster
Posts: 1509

Ireland 2006 Discovery 3 TDV6 Commercial Manual Zambezi SilverDiscovery 3

Bodsy wrote:
Nothing to do with the park brake, just the peddle not moving enough to trigger the release solenoid to get it out of Park/release the brake. As soon as you start the car, the peddle goes down I assume? So then the brake can be released as it’s the same mechanism that is stopping it from starting (I.e. the brake peddle switch not moving enough)


Can you manually push down on the switch so that it thinks you are pressing on the brake pedal?
  
Post #19615599th Jul 2018 10:22 am
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