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Brake modification question.
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Ray White



Joined: 02 Dec 2014
Posts: 3299
Location: Derby

PostPosted: Sun Dec 29, 2019 3:45 pm    Post subject: Brake modification question. Reply with quote

Hello all. My MG TC has the brake master cylinder under the floor (like a Morris Minor) and while the car is being assembled I would like to take the opportunity to add a remote fluid reservoir. This would make checking the level quicker and topping up much easier.

I have seen other owners modify the lid of the reservoir or (where possible) utilise a blanking plug. What I have in mind is to fit a T piece to the extension. As this is where the fluid enters the reservoir I can see no reason why it would not work - and be better than tapping into the lid - but I would very much like to know if I am missing something.

Please tell me now if it won't work rather than have me find out later by trial and error.

Obviously, the vent hole would need to be blocked and the lid properly sealed to prevent leaks but the new reservoir could be sited immediately above it on the engine side of the bulkhead.

Photo of my new master cylinder.

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47Jag



Joined: 26 Jun 2008
Posts: 1470
Location: Bothwell, Scotland

PostPosted: Sun Dec 29, 2019 4:02 pm    Post subject: Reply with quote

Ray,

I don't see why it shouldn't work but I don't understand the T piece. I would use the largest diameter tubing possible from the reservoir to the M/C.

Art
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ukdave2002



Joined: 23 Nov 2007
Posts: 3491
Location: South Cheshire

PostPosted: Sun Dec 29, 2019 7:13 pm    Post subject: Reply with quote

Hi Ray

If you simply fit a T piece to the extension the brakes wont work as when the pedal is pushed the cylinder will simply move fluid into the secondary reservoir, there wont be any pressure in the system.

Dave
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1413
Location: Above the snow line in old Monmouthshire

PostPosted: Sun Dec 29, 2019 8:14 pm    Post subject: Reply with quote

I'm sure I've seen master cylinders that are designed to work with remote reservoirs for Minors and the like. Perhaps something like that would be a better idea?
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Rick
Site Admin


Joined: 27 Apr 2005
Posts: 21026
Location: North-west UK

PostPosted: Sun Dec 29, 2019 8:20 pm    Post subject: Reply with quote

There's a kit available for Volvo PV444s, as the master cyl is located quite far down within the engine bay, and that uses a pipe that feeds from a remote container directly down into a modified cap.

RJ
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Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
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Ray White



Joined: 02 Dec 2014
Posts: 3299
Location: Derby

PostPosted: Sun Dec 29, 2019 9:29 pm    Post subject: Reply with quote

ukdave2002 wrote:
Hi Ray

If you simply fit a T piece to the extension the brakes wont work as when the pedal is pushed the cylinder will simply move fluid into the secondary reservoir, there wont be any pressure in the system.

Dave


Yes Dave. I hadn't thought it through. No good at all. No chance.

I'm an idiot. Embarassed Embarassed Embarassed

I will get a Morris Minor conversion kit.

That works .
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ukdave2002



Joined: 23 Nov 2007
Posts: 3491
Location: South Cheshire

PostPosted: Mon Dec 30, 2019 2:01 pm    Post subject: Reply with quote

Hi Ray

The post war Morris Minor has a male thread on the fluid cap, whereas your TC has a female thread, so some further modification will be required if you purchase this kit.

The Master Cylinder you have bought is made in Holland by C&C, (they make all the cylinders that we sell) they are beautifully made Smile and far more robust than the originals , its the same MC as the Morris 8 uses, our members often comment that they are gutted that the cylinders can't be seen when fitted!

The good news in terms of what you are doing is that both the chamber and cap will take a thread; the cap on these C&C cylinders is machined from solid aluminium, I'd be inclined to use the vent hole in the cap as a pilot for the hose fitting.

Rather than purchasing the MM kit, it would be much cheaper to simply buy a remote reservoir with some pipe and fittings.

Cheers

Dave
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Ray White



Joined: 02 Dec 2014
Posts: 3299
Location: Derby

PostPosted: Mon Dec 30, 2019 2:38 pm    Post subject: Reply with quote

ukdave2002 wrote:
Hi Ray

The post war Morris Minor has a male thread on the fluid cap, whereas your TC has a female thread, so some further modification will be required if you purchase this kit.

The Master Cylinder you have bought is made in Holland by C&C, (they make all the cylinders that we sell) they are beautifully made Smile and far more robust than the originals , its the same MC as the Morris 8 uses, our members often comment that they are gutted that the cylinders can't be seen when fitted!

The good news in terms of what you are doing is that both the chamber and cap will take a thread; the cap on these C&C cylinders is machined from solid aluminium, I'd be inclined to use the vent hole in the cap as a pilot for the hose fitting.

Rather than purchasing the MM kit, it would be much cheaper to simply buy a remote reservoir with some pipe and fittings.

Cheers

Dave


Dave. You have just posted what must be the most useful piece of information this year!

I began by thinking along the same lines of a simple 7/16" 20 tip fitting threaded into the cap (sealed) and a supply from a remote reservoir with a similar fitting. (I have saved a variety of containers in my watch list).

Then the MM kit was suggested but no mention of a different type of cap fitting.!!

Then I thought of the extension but as you pointed out it would not work. I guess it could work with a non return valve fitted thereby maintaining the pressure... but then you get into NTP threads... and most of these things seem to have a cracking pressure when free flow is needed. Probably expensive too!

Thanks again, Dave.
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