06-21-2022, 07:09 PM
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Member
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Join Date: Jun 2014
Location: SA, TX
Posts: 6,473
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Quote:
Originally Posted by sgrice
Fairly easy to diagnose with a vacuum pressure gauge. The vacuum pump on what is now my son's 35d went out last year at I think something like 140,000 miles. Symptoms of stiff brake pedal and poor braking. In our case the booster was fine. Replacing the vacuum pump solved everything. Not too hard of a repair as I recall - everything is right up front and fairly easy to get to.
Good luck with what I hope is your last repair!
Stephen
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Thanks Stephen! I would prefer it be the vacuum pump itself that failed rather than it leaking oil into the line which finds its way to the booster and takes it out. As you said, it's right up front and easy to get to. Will be using a Mighty Vac to check both the pump and the booster's ability to supply/hold vacuum. Will update after I get the oil changed on our E61 and get the E70 back into the garage. If I let the X5 idle for awhile, I do get a few good braking tries so perhaps the pump is failing to produce vacuum or there is a vacuum leak somewhere. *Fingers Crossed*
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)
2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)
2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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