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DISCO3.CO.UK > Maintenance & Mods (D3)

brakes locked on after master cylinder change
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garry2010
 


Member Since: 05 Sep 2010
Location: Liverpool
Posts: 9

England 2008 Discovery 3 TDV6 XS Auto Unknown ColourDiscovery 3
brakes locked on after master cylinder change

had very poor brakes when bought vehicle. Changed discs and pads but still very soft pedal. So I changed master cylinder and bled the brakes - traditional method via n/s/r bleed valve. Brake pedal slowly firmed up until no air coming out. But the brakes are very nearly locked on. It's as if they are not releasing. Any ideas or advice will be very welcome. Thank you.  
Post #237135518th Jun 2024 7:21 am
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6314

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

Did you make sure the push rod is central in the master cylinder and servo when fitted. I Once changed a RRS one and it had an adjustable rod in it, I had to shorten the length of the rod a bit to get the brakes off.

I can't remember if the D3 rod is the same. Did you fit a OEM Master Cylinder.

Flack Thumbs Up  
Post #237135718th Jun 2024 8:23 am
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garry2010
 


Member Since: 05 Sep 2010
Location: Liverpool
Posts: 9

England 2008 Discovery 3 TDV6 XS Auto Unknown ColourDiscovery 3

Hi Flack.

Thank you for replying.

Yes it's OEM. But I never thought to check the rod length. Not come across that before. How did you determine the correct length? Ive got the original unit still so I can check against that if needs be.

Thanks again  
Post #237136218th Jun 2024 10:00 am
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6314

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

When I refitted the master cylinder I noticed the pedal was rock hard, so I took off the m/c again and noticed that the rod was adjustable, so I just shortened the rod until it was ok.

Flack Thumbs Up  
Post #237136818th Jun 2024 12:50 pm
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