XF EDDIE 182 Posted February 2 Last night I was driving my xf when the brake fail light came on, it was coming on dimly and came and went a few times but has since disappeared. Ive heard that this light comes on when the proportioning valve moves too far one way but Im not too sure on what it actually means. The way it came on makes me think that its a dodgy switch but what else can I check to make sure everything is tip top. Share this post Link to post Share on other sites
bear351c 10,412 Posted February 2 Usually means low fluid level, or the hydraulic spool inside the Master cyl has travelled too far in one direction hitting the switch. Check your brake system thoroughly first, may be a faulty switch. 2 deankxf and XF EDDIE reacted to this Share this post Link to post Share on other sites
XF EDDIE 182 Posted February 4 On 2/3/2025 at 9:14 AM, bear351c said: Usually means low fluid level, or the hydraulic spool inside the Master cyl has travelled too far in one direction hitting the switch. Check your brake system thoroughly first, may be a faulty switch. Sure enough checked my back brakes and one of the springs broke off. Gonna fix it tommorrow and flush the fluid and see if that makes it happy. 2 bear351c and deankxf reacted to this Share this post Link to post Share on other sites
deankxf 20,937 Posted February 4 1 hour ago, XF EDDIE said: Sure enough checked my back brakes and one of the springs broke off. Gonna fix it tomorrow and flush the fluid and see if that makes it happy. that's the first time I've ever seen a reason for that light to come on, and the fact it worked is equally impressive. great to see @bear351c on the ball with this one, I've seen brake pads (discs) worn down to metal and not caused that light to come on Share this post Link to post Share on other sites
XF EDDIE 182 Posted February 5 11 hours ago, deankxf said: that's the first time I've ever seen a reason for that light to come on, and the fact it worked is equally impressive. great to see @bear351c on the ball with this one, I've seen brake pads (discs) worn down to metal and not caused that light to come on Honestly Im not too sure if this caused it or it was a coincidence as the light only came! on for a bit and then went out but I can see how a spring snapping could cause the brakes to become just uneven enough for it to set off the warning but either way kudos to the xf for giving me some kind of warning! 1 deankxf reacted to this Share this post Link to post Share on other sites
