Home > Technical (L322) > Brake pedal sinks to floor |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1199 |
I don't know what the master cylinder seal looks like but is it possible that it could have 'flipped' the wrong way hence the peddle creep and then when you pulled the piston out it could have flipped the correct way therefore explaining why it's mysteriously resolved it's self, if that makes sense? |
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15th Aug 2024 10:35am |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1199 |
Goin to give this pressure bleeder a go.
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15th Aug 2024 1:04pm |
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Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 682 |
Well done on a positive result ! It's possible that there may have been a tiny bit of debris stuck on the lip of 1 of the main pressure generating seals - enough to cause a small amount of fluid to escape very slowly around the debris & resulting in a slow loss of pressure / pedal creep. You could have dislodged it while removing / cleaning the internals. We used to investigate faulty mastercylinders - with the failure description "pedal went to floor" where I worked & often by the time we investigated they would test as "good" & we couldn't find an internal fault. Sometimes you can dislodge debris on seal lips during the bleed process - especially a pressure bleed - as you can force fluid over the seal lips "cleaning off" small particles. You can cause a similar effect sometimes by applying the brake, then pulling the brake pedal back fast. Paul, 2001 Discovery 2 TD5, 211,000 miles & climbing 2006 FFRR TDV8 Vogue 145,000 miles & climbing Member of Midland (Land) Rover Owners Club, www.mroc.co.uk |
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15th Aug 2024 1:38pm |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3169 |
Just tried this but no change. I can push the pedal down with my hand so it's not requiring much force. Also tried an emergency stop from 50mph and >2.5 tonnes decelerated so fast I thought the laws of physics suddenly stopped applying. 2012 TDV8 Vogue (L322) |
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15th Aug 2024 4:39pm |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1199 |
Just an update on my previous post up above.
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29th Aug 2024 8:56am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3169 |
Great news! - Do the brakes feel more effective in a hard stop or is it just the pedal feel and was it a 1 person operation or does it need another pair of hands? 2012 TDV8 Vogue (L322) |
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29th Aug 2024 9:19am |
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kevinp Member Since: 28 Sep 2019 Location: Telford Posts: 1199 |
The brakes worked fine before but the pedal travel was long, sometimes needing a double press to get the pedal back near the top.
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29th Aug 2024 10:25am |
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JayGee Member Since: 27 Jul 2021 Location: London Posts: 3169 |
Don't have a compressor...... 2012 TDV8 Vogue (L322) |
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29th Aug 2024 11:56am |
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