dduelin Posted June 6 Share Posted June 6 When the four year brake flush is done should I exercise the ABS pump with the GS911? I only have the Haynes manual and it doesn't include any such detail. I already flushed the four year old DOT4 and buttoned up the system last week but I can do it again. Link to comment
dirtrider Posted June 6 Share Posted June 6 52 minutes ago, dduelin said: When the four year brake flush is done should I exercise the ABS pump with the GS911? I only have the Haynes manual and it doesn't include any such detail. I already flushed the four year old DOT4 and buttoned up the system last week but I can do it again. Afternoon dduelin You can do it that way. Personally, after the initial bleed service I turn the key to on, then spin the rear wheel & while using the front hand lever. That exercises the rear brake servo pump (I do this a few times) then I do a quick rear brake re-bleed. There is no front servo pump. Link to comment
dduelin Posted June 6 Author Share Posted June 6 25 minutes ago, dirtrider said: Afternoon dduelin You can do it that way. Personally, after the initial bleed service I turn the key to on, then spin the rear wheel & while using the front hand lever. That exercises the rear brake servo pump (I do this a few times) then I do a quick rear brake re-bleed. There is no front servo pump. Thanks, maybe a dumb statement on my part but I have a 2007 and didn't know it had a servo pump. I thought that servo pumps were only on 2005-2006 models. Link to comment
dirtrider Posted June 6 Share Posted June 6 46 minutes ago, dduelin said: Thanks, maybe a dumb statement on my part but I have a 2007 and didn't know it had a servo pump. I thought that servo pumps were only on 2005-2006 models. Evening Dave The 2006/2006 has a front & rear servo pump. Your 2007 only has a rear servo pump (rear servo pump is the way BMW gets a linked front/rear brake along with a stand alone rear brake from the brake pedal. With a single rear caliper but only one hydraulic input that is way it has to be to have both a linked & stand alone rear brake. 1 Link to comment
Uncle Brad Posted June 8 Share Posted June 8 On 6/6/2024 at 6:19 PM, dirtrider said: Evening Dave The 2006/2006 has a front & rear servo pump. Your 2007 only has a rear servo pump (rear servo pump is the way BMW gets a linked front/rear brake along with a stand alone rear brake from the brake pedal. With a single rear caliper but only one hydraulic input that is way it has to be to have both a linked & stand alone rear brake. My turn to ask a dumb question. With only a rear servo pump, does that mean that the ABS only works on the rear tire? I bought a 2007 with non-working ABS and i assumed that the ABS was fore and aft. Link to comment
dirtrider Posted June 8 Share Posted June 8 9 minutes ago, Uncle Brad said: My turn to ask a dumb question. With only a rear servo pump, does that mean that the ABS only works on the rear tire? I bought a 2007 with non-working ABS and i assumed that the ABS was fore and aft. Morning Uncle Brad Not a dumb question, The rear brake uses a servo pump for both linked rear brake apply but also for rear ABS make-up fluid during an ABS event. The front brake is not linked to the rear pedal so it doesn't need a servo pump for linking. The front brake uses a fast acting valved fluid accumulator for ABS make-up fluid during an ABS event. 2 Link to comment
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