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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Nov 2015
Posts: 8,684 Likes: 493
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,684 Likes: 493 |
If you take off the top-up cap off the master cylinder, put some thin polythene bag material over the top & then screw the cap back on it will override the vent in the cap, then you can release fittings downstream in the pipework and the subsequent slight vacuum will reduce the lost fluid to almost zero, often removing the need to bleed (works on hydraulic clutches too)
Jon M
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Joined: Aug 2012
Posts: 98 Likes: 2
Just Getting Started
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OP
Just Getting Started
Joined: Aug 2012
Posts: 98 Likes: 2 |
Many thanks for all your responses. Much appreciated.
Investigation work starts tomorrow.
Gary
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Joined: May 2010
Posts: 9,545 Likes: 132
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,545 Likes: 132 |
Do the quick test of bypassing the hydraulic switch first. That tells you if it is the switch at fault. The tip of sealing the master cylinder reservoir is a good one too. I think DaveW did some work on changing to a brake pedal switch instead of the hydraulic one too.
Plus Four MY23 Furka Rouge
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Joined: Dec 2008
Posts: 22,366 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,366 Likes: 354 |
Yes I added a relay first but then rewired it through a pedal switch. It's easy enough to do!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2019
Posts: 5,447 Likes: 469
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,447 Likes: 469 |
With brake lights perhaps being considered as a safety circuit, it seem the simpler the circuit design, the fewer components and connections involved, perhaps it might be less likely to fail, and if it fails, the simpler may be find the cause of failure, for those with a minimum of electrical understanding...?
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1 member likes this:
RichardV6 |
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Joined: Feb 2013
Posts: 516 Likes: 58
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2013
Posts: 516 Likes: 58 |
If you stick led bulbs in the brake lights it is a lot less of a current drain and the hydraulic brake switch should last a long time (so long as it doesn't leak).
DB
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Joined: Aug 2012
Posts: 98 Likes: 2
Just Getting Started
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OP
Just Getting Started
Joined: Aug 2012
Posts: 98 Likes: 2 |
All sorted.
I bypassed the hydraulic switch as a number of you mentioned and hey presto, the lights worked.
The terminals on the switch were filthy and having given them a gentle clean with some emery paper, I reconnected everything and the lights now work fine.
A simple solution in the end, but very grateful for all the tips.
Everyday is a school day!! 😂😂
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