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DISCO4.COM > Faults & Fixes (D4)

Hard brake pedal every morning
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crip010
 


Member Since: 01 Oct 2014
Location: Twickenham
Posts: 433

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4
Hard brake pedal every morning

I have a MY10 and every morning for the last couple of weeks the brake pedal is rock hard. Does anybody have any ideas before I change the brake servo. My garage is going to change the first pipe out of the servo as that only £9 and easy to try.

I have read loads about Discovery 3s having an issue but nothing on the 4s, any ideas Bow down  
Post #18744571st Nov 2017 8:59 am
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2083

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Suggests to me that the none return valve in the vacuum source is leaking overnight . If its in the pipe your garage is right in suggesting that first. If you start the engine with your foot on the brake pedal, the pedal should go down and have a softer feel. My Diesel did it after about 4 days if not used ,  
Post #18744921st Nov 2017 10:07 am
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crip010
 


Member Since: 01 Oct 2014
Location: Twickenham
Posts: 433

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

yes its fine when engine is running so its just leaking overnight which it shouldn't really.

Just seeing if any less expensive things to do before changing the servo.  
Post #18744951st Nov 2017 10:16 am
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crip010
 


Member Since: 01 Oct 2014
Location: Twickenham
Posts: 433

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Any ideas or pointers from anybody?  
Post #18747531st Nov 2017 9:12 pm
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galwaygreen
 


Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525

United Kingdom 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Loire BlueDiscovery 4

I was like that in my younger days  
Post #18747581st Nov 2017 9:18 pm
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Canburne
 


Member Since: 15 Jan 2013
Location: Devon
Posts: 2036

Ukraine 2015 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

Rolling with laughter Rolling with laughter Rolling with laughter Rolling with laughter Rolling with laughter Rolling with laughter Me too! .
"the inherent vice of capitalism is the unequal sharing of blessings....the inherent vice of socialism is the equal sharing of miseries" Winston Churchill

2016 D4 Landmark Club Waitomo ...or is it Club Tempest????
2015 D4 HSE Aintree Green  
Post #18747961st Nov 2017 10:37 pm
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crip010
 


Member Since: 01 Oct 2014
Location: Twickenham
Posts: 433

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

you guys Rolling with laughter Rolling with laughter  
Post #18747991st Nov 2017 10:41 pm
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crip010
 


Member Since: 01 Oct 2014
Location: Twickenham
Posts: 433

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

All fixed, it was sorted by changing the pipe coming out of the servo.

Always like a cheap fix Very Happy

The part number is 5h22-2a047-bb for reference.  
Post #18752773rd Nov 2017 8:43 am
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swansty
 


Member Since: 21 Sep 2008
Location: Northern Ireland
Posts: 942

Northern Ireland 2010 Discovery 4 3.0 TDV6 XS Auto Zermatt SilverDiscovery 4

Sadly replacing this part hasn’t solved my hard brake pedal. Booked in to get looked at but if anyone has any ideas I would appreciate it.  
Post #20652861st Jul 2019 11:31 am
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swansty
 


Member Since: 21 Sep 2008
Location: Northern Ireland
Posts: 942

Northern Ireland 2010 Discovery 4 3.0 TDV6 XS Auto Zermatt SilverDiscovery 4

Just in case anyone else has the same problem. Servo replaced and problem fixed.  
Post #207130226th Jul 2019 8:23 am
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