Brake pedal goes to floor
- Thread starter beatfreak
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blue beasty
Leaks an prone to bits dropping off
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When yer engine is running the servo is adding extra effort to yer foot.
Either air in the system or fluid leaking past seals...if no evidence of leak at slaves then leaking inside master cylinder.
Either air in the system or fluid leaking past seals...if no evidence of leak at slaves then leaking inside master cylinder.
blue beasty
Leaks an prone to bits dropping off
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- 63,095
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- Gloucestercotshirewolds
Yes but less noticeably without the added effort of the servo
blue beasty
Leaks an prone to bits dropping off
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- 63,095
- Location
- Gloucestercotshirewolds
That's nice, still doent change anything.
The only difference having the engine running makes to the braking system is the servo adds effort.
If the pedal goes down slowly it's most likely fluid is leaking past the master seals or leaking out somewhere
If that's the only difference surely with a huge amount of unassisted pressure the master cylinder would still leak? I can stand on the brake pedal for 5 minutes without the engine running and it wont budge, same if i disconnect the vacuum tube while the engine is running.
blue beasty
Leaks an prone to bits dropping off
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Stand on yer brake with both feet while freewheeling downhill, engine off and try and lock yer wheels up.
Jump up and down on it if ya want.
You'll never equal the pressure given by the servo.
You asked for ideas, I gave you mine...you're losing hydraulic pressure either through a leak or past the master seals. I'm not going to argue whether it's possible
Jump up and down on it if ya want.
You'll never equal the pressure given by the servo.
You asked for ideas, I gave you mine...you're losing hydraulic pressure either through a leak or past the master seals. I'm not going to argue whether it's possible
flat
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i don’t understand why people ask for advice and ideas when they are stuck, and then fight back against totally reasonable suggestions.
blue beasty
Leaks an prone to bits dropping off
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A little bit of knowledge is dangerous. You think you know enough about something then someone comes along and states something you can't accept because you think it brake the rules
Pun intended
discool
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Ok then the reason must be an iffy seal and so find which seal repair or replace.
Are u familiar on why a seal will leak after bleeding.?
Yes I am. Replaced master cylinder, same result. Hence why I asked as I didn't want to waste money on the obvious and thought maybe it was a fault someone else had experienced. No fluid leaks anywhere else and after pumping the pedal to the floor 50 times or so which would have emptied the fluid reservoir so bit stumped now.
I was going to suggest that you might have flipped the master cylinder seals when winding the pistons but then you mention that you had replaced the master cylinder after you replaced the pads. If yours is a TD5, you might need to finish the job with an ABS bleed and a power bleed once you open the brake system.
Didn’t accept it because it was wrong. Asked for help not a belittling by know it alls. Turns out it was a ballooning brake hose. No seals gone, no faulty master cylinder. Front hoses replaced, problem solved.A little bit of knowledge is dangerous. You think you know enough about something then someone comes along and states something you can't accept because you think it brake the rules
Pun intended
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Wasn't aimed at you specifically, we've all been guilty of it at some point, I know i certainly have
Glad you got sorted
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So without the engine running and the servo assistance you didn't have a ballooning brake hose, which shows how much assistance the servo gives.
Looks like you had an unusual fault rather than the more common one most people have.
Glad it's sorted and thanks for sharing,
blue beasty
Leaks an prone to bits dropping off
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- 63,095
- Location
- Gloucestercotshirewolds
Glad you worked it out
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