Car hesitates and dies with hard brake pedal - BMW M5 Forum and M6 Forums
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post #1 of 44 Old 23rd December 2017, 12:07 AM Thread Starter
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Car hesitates and dies with hard brake pedal

Hi, I have 2002 M5 with 136,XXX miles and the car started to stall as I was driving. The car just died and the brake pedal went rock hard. I've searched the forums and it looks like an issue with the brake booster. Would that also cause issues with the throttle? I noticed last night that the throttle had a slight hesistation. I'm waiting for a tow now and will pull INPA codes when I get home. The car starts, but the engine is surging a bit and the brake pedal stays hard. Any ideas? Thanks

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post #2 of 44 Old 23rd December 2017, 12:16 AM
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sounds like an intake air leak someplace, you can smoke it or use carb/brake cleaner to find general area.
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post #3 of 44 Old 23rd December 2017, 01:35 AM
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Open the cabin air filter on the drivers side. Make sure it’s not filled with water.

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post #4 of 44 Old 23rd December 2017, 01:50 AM Thread Starter
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post #5 of 44 Old 23rd December 2017, 04:18 AM Thread Starter
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So I pulled the drivers side cabin air filter and it was dry. So was the area beneath where the brake booster resides. The drain wasn't clogged either. I read the stored error codes via INPA here are the codes:

Old codes (I've been monitoring these since I bought the car last month):
14 DMTL Heating
105 Engine Coolant Temperature Implausible
143 E-Box fan

Today since the problem started:
8 Intake Cam Position Sensor Bank2
184 Inlet VANOS Bank 1 Function
205 Misfire Cyl1 without Cyl Cutout
207 Misfire Cyl3 without Cyl Cutout
208 Misfire Cyl4 without Cyl Cutout
209 Misfire Cyl5 without Cyl Cutout
210 Misfire Cyl6 without Cyl Cutout
211 Misfire Cyl7 without Cyl Cutout
212 Misfire Cyl8 without Cyl Cutout
213 Misfire Multiple Cylinders without Cyl Cutout

The brake pedal is rock hard, even after turning on the ignition. If I hold the pedal down and turn the car on the revs shoot up and the pedal doesn't go down. The car has an erratic idle. I did notice last night that the throttle had a slight hesitation as I was driving home from dinner. I drove the car to work and on the freeway today and it felt like normal until the car stalled and brake pedal became hard. Any ideas on the next steps? I plan on searching the forums to see if anyone else has run into this before. I'll get some carb cleaner and spray it around the brake booster to try and find a vacuum leak.

Thanks!
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post #6 of 44 Old 23rd December 2017, 04:45 AM
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It sounds like the booster or the lines, there is a y line in back of engine that runs between both banks into the the booster. It's part of the idle air system so that's why it revs or stalls. It could be the lines, the booster or the gasket gromet into the booster. Booster make a fart/duck noise when they go so I'm leaning towards the lines but it could be any of the three.

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post #7 of 44 Old 23rd December 2017, 05:17 AM Thread Starter
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Thanks Ferris, I'll check that area out. Would this cause the 8 and 184 error codes? From my limited searching it seems this may be a faulty CPS.
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post #8 of 44 Old 23rd December 2017, 01:37 PM
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I assume at least the CPS one is valid and I'd plan on changing the sensor but sometimes errors compound each other and become red herrings. I'd fix the sensor and the vacuum leak , clear everything and then see where you're at.

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post #9 of 44 Old 24th December 2017, 05:07 AM Thread Starter
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Everyone, thanks for all the replies. I did what Ferris suggested and sure enough the hose from the tee to the brake booster was no longer connected. Looks like it broke clean off on from the tee. I'll go ahead and replace the Intake CPS on that side while I'm in there. Does anyone know the part number for the tee? It's the one that #10 hose goes to:

RealOEM.com - Online BMW Parts Catalog

Thanks

Last edited by Grateful; 24th December 2017 at 05:07 AM.
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post #10 of 44 Old 24th December 2017, 05:23 AM
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Glad you found the problem and thanks for following up. When you order 10, you’ll get the T.

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