Brake Fluid Transfer

Candellara · Post by **Candellara** » Wed Nov 12, 2014 2:03 pm

After a spirited run out a few months back, i have only just noticed that there seems to be a transfer of brake fluid happening. The front brake circuit reservoir seems to be depleting and filling the rear brake reservoir. Anyone come across this before? and what's the normal cause?

christopher storey · Post by **christopher storey** » Wed Nov 12, 2014 3:39 pm

Leaking seals in the servo shuttle is the most likely cause, I'm afraid

Candellara · Post by **Candellara** » Wed Nov 12, 2014 5:07 pm

Hi Chris,

Whereabouts is the shuttle located as the brake servo is brand new - supplied by SNG

Jason

abowie · Post by **abowie** » Wed Nov 12, 2014 8:37 pm

Candellara · Post by **Candellara** » Thu Nov 13, 2014 8:52 am

Ok, so in my terminology - brake master cylinder :-)

I guess it's a case of, remove and get a replacement under warranty as i purchased the complete assembly brand new only a few months ago
:(

christopher storey · Post by **christopher storey** » Thu Nov 13, 2014 9:20 am

Ah, no, it's not the brake master cylinder. That is the hydraulic device which is connected to the pedal. The servo shuttle ( as I call it ) is just that : it is a vacuum /hydraulically operated shuttle which delivers servo assisted hydraulic pressure from the main supply ( which comes from the master cylinder and from the second fluid reservoir ) and sends it to the front and rear brake lines

Candellara · Post by **Candellara** » Thu Nov 13, 2014 1:20 pm

Thanks for clarity Chris. It appears that i've a "new" faulty unit which luckily is still under warranty

christopher storey · Post by **christopher storey** » Fri Nov 14, 2014 10:28 am

Actually, I've had a thought . Before you take the whole servo out and send it back, disconnect the secondary fluid bottle B at the servo unit and check what I think is a one way valve which ( IIRC ) screws into the top of the servo unit . It is probably a white plastic device. It is item C in the diagram of the servo . Note that B and D are often transposed - the factory altered them from time to time, but the transposition seems to make no difference

Candellara · Post by **Candellara** » Fri Nov 14, 2014 4:42 pm

Thanks Chris - i'll have a look this weekend

Jason

Candellara · Post by **Candellara** » Sat Nov 15, 2014 6:57 pm

Hi Chris,

No sign of any one way valves UNLESS, these are the large nuts that the rear reservoir and rear brake circuit screw into on the cylinder?

There are four connections on the cylinder and the two nearest the front of the car (rear brake circuit and rear brake reservoir) screw into large adaptors? that in turn screw into the cylinder. Are these one way valves?

abowie · Post by **abowie** » Sat Nov 15, 2014 11:39 pm

The trap valve is fitted under the outlet connection at D. It is a little plastic casting with a spring under it.

As the threads on the 4 holes in the cylinder body are all different it would be difficult if not impossible to misassemble it. I suppose the spring and casting could be fitted under the inlet connection at C but it would be too small to do anything.

I have never understood what this valve actually does in normal usage; it is too weak to prevent flow against braking line pressure and in any event if it did it would interfere with brake function. I assume it is there to do something if the front circuit fails?

Candellara · Post by **Candellara** » Sun Nov 16, 2014 8:58 am

Hi Andrew,

Had a look and i definitely do not have any plastic casting. Are we talking about the bolt at the end of the cylinder which affixes the cylinder via a bracket to the engine frame?

If i remember correctly, if you unscrew this bolt there's a spring behind it?

abowie · Post by **abowie** » Sun Nov 16, 2014 9:17 am

Valve is #29

Candellara · Post by **Candellara** » Sun Nov 16, 2014 12:32 pm

Thanks Andrew - that's a big help. I'll report back when i've replaced

Jason

Candellara · Post by **Candellara** » Mon Nov 17, 2014 8:59 pm

Bad news - SNG don't supply this part separately :(

Any ideas where to source one?

paulsco · Post by **paulsco** » Mon Nov 17, 2014 9:59 pm

You could try Past Parts, or maybe just try cleaning the components; there is not much to it that can go wrong.

I thought you stated your servo was a recent purchase; is it not guaranteed?

Paul

Candellara · Post by **Candellara** » Tue Nov 18, 2014 9:17 am

Yes Paul, it's under warranty. As i have the system currently drained i might just disconnect and return it

rayloud@outlook.com · Post by **rayloud@outlook.com** » Sun Aug 20, 2023 3:35 pm

I've got the same going on. People suggesting the servo. Let me know if you find out any more. Thanks

christopher storey · Post by **christopher storey** » Mon Aug 21, 2023 8:19 am

Rayloud : this thead is nearly 9 years old, so you are unlikely to get any feed back

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