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#1
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Brakes have failed😟 FIXED!!
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. Last edited by X5only; 09-10-2024 at 04:33 PM. |
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#2
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The brake booster is toast. Time to replace it. Check the vacuum hose first. It could have a hole somewhere on it. Is idle steady or does it swing?
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#3
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Vacuum pump on my 4.8is did the same thing but it made a gurgling sound instead.
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
#4
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Managed to have DIS to talk to DSC system - no errors and I could do tests like running the pump, measuring brake pedal pressure, checking brake fluid level, etc. I visually inspected the vacuum line from the vacuum pump and all look fine to me. The engine idles steady. Wouldn't an error be thrown if there were problems with the brake booster?
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
#5
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Brake pedal to the floor = master cylinder issues. Get a rebuild kit or get a new MC.
Bad booster = hard brake pedal. The symptoms are different.
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
#6
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Makes sense as booster helps in driver brake pedal effort, thank you. Any info on good source of rebuilt MC? It's amazing no error thrown when such a critical failure occurs. As much as I love this vehicle, but this issue shows the tech age of the E53.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. Last edited by X5only; 09-01-2024 at 07:29 PM. |
#7
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How much was the brake pressure with diagnostics when pressing the brake pedal? Should go above 80 bar with max pedal force.
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey Last edited by Clavurion; 09-01-2024 at 06:53 PM. |
#8
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Thank you Clavurion Is this pressure value with engine running or off? Brake pedal is solid stiff with engine off. As soon as I turn the engine on, the pedal falls right to the floor.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
#9
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Quote:
Engine off - 31 bar Engine running- 29 bar
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. |
#10
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From ECSTunning:
$274.49 OEM (TRW) BMW Power Brake Booster - 34336760461 Has your brake pedal become stiff and hard to depress, or goes right to the floor with no pressure or feel, most likely the brake booster unit has failed. Power Brake Booster Failure Symptoms Hard pedal with no braking power Longer stopping distance Engine stalls with brakes applied Brake pedal position higher than normal $200 OEM (TRW) BMW Brake Master Cylinder - 34316757743 Brake Master Cylinder Failure Symptoms Spongy Pedal Feel Loss of brake operation Poor brake performance Internal fluid leaks External fluid leaks I found a great DIY for installing both MC and booster, but I hate brake bleeding, especially when dealing with air in the braking system. Might just take this work to a shop if cost is reasonable. Or maybe do all the parts install myself and have the vehicle towed to a shop just for brake bleeding. https://xoutpost.com/bmw-sav-forums/...inder-diy.html
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M. Last edited by X5only; 09-01-2024 at 10:12 PM. |
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