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#1
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Brakes failed, car rolled back dangerously
The brake pedal would intermittently soften over a few months back, but I had ignored it. The failure was like instant. What could cause this? My techie says it's the brake master cylinder, but he seems to be using elimination method. He will probably say it's the booster thereafter. Anyone experienced this? 2007 E70 3.0si Sent from my SM-G990U1 using Tapatalk |
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#2
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Classic master cylinder failure mode, or a split/bad leak in two brake hoses.
How was the bi-annual brake flush done, if the pumping the pedal method was used, the seals in the m/c are probably shot. If the bi-annual flush was not done, probably the moisture has gotten to multible calipers and it is time to renew your brakes. What is the mileage and weather like where SAV is operated, will help more with diagnostics. Sent from my SM-T377V using Tapatalk |
#3
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Line failure? Something is preventing any pressure from being built up in both circuits though, so maybe it could be the master. I've had hard lines under the car (in an E53 corrode and eventually split under pressure, but unless a line in both circuits went at the same time, it seems unlikely you would loose any and all brake function..
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~Scott -------------------- Black Sapphire Metallic/Sand Beige '13 E70 35d, SP, NAV, Tech, Comfort Access/Seats 20" Style 214's Wrapped in Continental DWS06 Extreme Contacts (SOLD) Alpine White/Sand Beige '06 E53 3.0, SP, PP, CC, RC, NAV, Sat Radio 19" Style 63's Wrapped in Bridgestone Dueler HP Sports-- Summer Shoes 18" Style 131's Wrapped in 255/55-18 Nokian WRG2 SUV's -- Winter Boots |
#4
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Sent from my SM-G990U1 using Tapatalk |
#5
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lol..your brakes have been failing for months...yet you seem to insist this was 'sudden and totally unexpected'
Seriously.... |
#6
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Every two years flush or else. As Ard implied, your soft pedal during previous months told you something was wrong. Classic failed M/C. Sent from my SM-T377V using Tapatalk |
#7
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You can go three years with this extended life Bosch product
https://www.amazon.com/gp/product/B07338GQM8 |
#8
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The pedal was a little softer, just a little softer... and I ignored it. I just did not expect a sudden failure the way it happened. Sent from my SM-G990U1 using Tapatalk |
#9
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Sent from my SM-G990U1 using Tapatalk |
#10
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Sent from my SM-G990U1 using Tapatalk |
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