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2003 BMW X5 3.0L. BRAKE PEDAL LOW, SOLID AFTER HALF WAY.

Customer Question
2003 BMW X5 3.0L...

2003 BMW X5 3.0L. BRAKE PEDAL LOW, SOLID AFTER HALF WAY. FRONT WHEELS LOCK BUT NOT THE REAR WHEELS. BLEED THE REAR, NO AIR AND GOOD FLOW. NO ABS WARNING LIGHT. REPLACE MASTER CYLINDER AND STILL THE SAME.

Mechanic's Assistant: Is it just the ABS light? Or is the brake system warning light on, too?

NO BRAKE WARNING LIGHT NOR ABS LIGHT. ALL NORMAL IN THE DASH

Mechanic's Assistant: Are you fixing your X5 yourself? What have you tried so far?

CHECK ABS CODE (NO CODE), BLEED ALL BRAKE SYSTEM. REPLACED BRAKE MASTER CYLINDER.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

THAT'S ALL

Submitted: 1 year ago.Category: BMW
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Answered in 10 minutes by:
3/22/2017
BMW Mechanic: Gunvir Singh,
 replied 1 year ago
Gunvir Singh
Category: BMW
Satisfied Customers: 2,013
Experience: Master Tech at Kennesaw Auto Tech
Verified

Was the master cylinder leaking before you replaced it?

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Customer reply replied 1 year ago
No external leak I can see. But reservoir is low at minight mark. All pads and rotors are new.
BMW Mechanic: Gunvir Singh,
 replied 1 year ago

Did you check the vacuum going to the brake booster?

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Customer reply replied 1 year ago
The vacuum booster works normally
BMW Mechanic: Gunvir Singh,
 replied 1 year ago

Did you check the vacuum pump and the booster separatly?

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Customer reply replied 1 year ago
I don't think this model has vacuum pump.
BMW Mechanic: Gunvir Singh,
 replied 1 year ago

i'm sorry had another bmw x5 opened up.

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BMW Mechanic: Gunvir Singh,
 replied 1 year ago

Did this problem happen before or after the rear brake adjustment?

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Customer reply replied 1 year ago
Before the brake job.
BMW Mechanic: Gunvir Singh,
 replied 1 year ago

How did you check the booster?

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Customer reply replied 1 year ago
Pump the brake pedal with engine running. Then turn off the engine feel the pedal slowly getting harder while pump.
BMW Mechanic: Gunvir Singh,
 replied 1 year ago

i'm running out of ideas on this one. i'll open this up for other expert to help.

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BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 24,218
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

Do you still need help?

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Customer reply replied 1 year ago
I"m OK now, Thanks for your help.
The problem was corroded brake line. It's well hidden not much fluid came out. eventually drip out from splash shield.Also suck the air back in while release the brake padel.
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

I'm glad you got it repaired!

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