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Brake master cylinder #1628420
06/01/2019 20:03
06/01/2019 20:03
Joined: Nov 2018
Posts: 6
Bedfordshire
J
Jhoney Offline OP
Newbie
Jhoney  Offline OP
Newbie
J

Joined: Nov 2018
Posts: 6
Bedfordshire
Got a spongy clutch pedal and noticed some fluid leaking into footwell, I take it my master cylinder is gone? Any advice on changing one of these much appreciated. Ps where is the fluid reservoir? Thanks in advance

Re: Brake master cylinder [Re: Jhoney] #1628424
06/01/2019 21:50
06/01/2019 21:50
Joined: Mar 2007
Posts: 10,471
Auld Reekie
Edinburgh Offline
Club Board member
Edinburgh  Offline
Club Board member
I AM a Coop

Joined: Mar 2007
Posts: 10,471
Auld Reekie
Check it's not the heater matrix leaking onto the footwell carpet - common fault if it's not been changed previously.

Does your clutch pedal sink to the floor while stationary but when you lift it back up with your foot it maintains pressure? If so that's probably the master cylinder and it's awkward to get at.

If the pedal falls flat to the floor think slave cylinder - accessed under battery tray.


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Re: Brake master cylinder [Re: Jhoney] #1628427
07/01/2019 05:33
07/01/2019 05:33
Joined: Dec 2005
Posts: 1,585
Brisbane, Australia
Possum Offline
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Possum  Offline
My life on the forum

Joined: Dec 2005
Posts: 1,585
Brisbane, Australia
Originally Posted By Jhoney
Ps where is the fluid reservoir? Thanks in advance


The reservoir is against the firewall and it serves both the brakes and clutch.


Re: Brake master cylinder [Re: Jhoney] #1628459
07/01/2019 22:26
07/01/2019 22:26
Joined: Nov 2018
Posts: 6
Bedfordshire
J
Jhoney Offline OP
Newbie
Jhoney  Offline OP
Newbie
J

Joined: Nov 2018
Posts: 6
Bedfordshire
Definitely clutch fluid leaking out. When I put foot on pedal it goes to floor and slowly returns when I lift off, can only just change gear now. When I replace will I have to bleed the brakes as well? Never changed one of these before so a bit green. Thanks for the info so far 👍👍

Re: Brake master cylinder [Re: Jhoney] #1628460
07/01/2019 22:39
07/01/2019 22:39
Joined: Mar 2007
Posts: 10,471
Auld Reekie
Edinburgh Offline
Club Board member
Edinburgh  Offline
Club Board member
I AM a Coop

Joined: Mar 2007
Posts: 10,471
Auld Reekie
Sounds like master cylinder - the internal seal goes but isn't always associated with actual fluid loss, though it sounds like it's a possibility in your case.

If your windscreen has collected a film over the inside which is difficult to clear I would still investigate the heater matrix.....


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