This LRO reader emailed LRO.firstname.lastname@example.org seeking help for their Discovery 3 and its misbehaving parking brake.
My brother-in-law is a hill farmer whose 40,000-mile, 2007 Discovery 3 manual leads a hard life (often with me at the wheel…). It gets used regularly for towing right up to the limit, it is continually being plastered by mud and it sees low-box action at least once everyday. The tailgate opening failed (not up to being jetwashed!) and the suspension pump broke once - but the only real issue is with the electronic parking brake, which has been replaced three times at vast cost.
It makes the familiar awful screech and then soon after sticks on; the local specialist takes the D3 away and we get another hefty bill. It also seems to trigger the fault soon after the automatic release (drive-off) is used. I use that, my brother in law never does, and it has failed in my hands twice now!
Richard Chandler, Comberback, Cheshire
Does the park light come on, and do you lose the gear indicator numbers on the dashboard? This can often affect the auto release. Have the vehicle checked with a suitable diagnostic machine to see what faults it shows.
When the handbrake module was replaced, were the brake discs and shoes replaced at the same time?
The handbrake shoes on these vehicles are very temperamental and need very precise setting-up. The arms on the shoes are prone to seizing. Replacing the pins and clips (and springs if necessary), and making sure the shoes are aligned correctly is essential, and although most workshops are capable of changing the handbrake module, not all of them know how to set the system up accurately afterwards.
Given the D3’s hard-working life, I would recommend that you have the handbrake shoes adjusted regularly to ensure they’re always correctly aligned.
This workshop advice appeared in the August 2015 issue of LRO. Back issues are available to download on digital devices here.