Disappearing brake fluid

[Else]

Pretty sure i know the answer to this one, the brake master cylinder must be leaking into the servo chamber because there is no visible sign of any leaks.

I am guessing the pedal box has to come out to change the master cylinder?

Else

Edited by Else on Friday 17th April 13:37

[Andav469]

Else said:

Pretty sure i know the answer to this one, the master cylinder must be leaking into the servo chamber because there is no visible sign of any leaks.

I am guessing the pedal box has to come out to change the master cylinder?

Else

Any sign of leaks from your slave cylinder?

[Else]

Andav469 said:

Any sign of leaks from your slave cylinder?

Its the brakes, sorry i didn't make that clear did I

[bluezeeland]

try this before getting the spanners out;

http://www.newtonnet.co.uk/coupe/service/webtech/i...

[Andav469]

Else said:

Its the brakes, sorry i didn't make that clear did I

Oops, yes you did, it was me not paying attention!

[Else]

bluezeeland said:

try this before getting the spanners out;

http://www.newtonnet.co.uk/coupe/service/webtech/i...

Thanks, but i think the servo (Booster as its called in the good ole US of A) is alright, i have suspicions that the seal is letting brake fluid leak out of the master cylinder which then ends up in the servo chamber. Please correct me if i'm wrong, i would prefer not to take the pedal box out if i can help it.

Else

[over_the_hill]

Not necessarily the cylinder.

You might have a small hole in a brake line that only lets fluid out when you apply the brakes and the pressure increases. Depending which way the hole is facing this could be sprayed straight onto the road as you drive along.

It might be worth (assuming you can) getting the car up and asking someone to pump the brake a few times while you have a good look around underneath with a torch.

[carsy]

True but my money will be on the master cylinder leaking into the servo as Else predicts.

I bit the bullet on mine and did the whole thing. Pedal box out new servo and master cylinder. Job done, hopefully for a long time. Its not that bad just messy with brake fluid.

Off topic Else but what figures did that engine of yours eventually make.

[pb450]

I had this problem many years ago on my MGB V8. No loss of fluid from the car but it all slowly shipped out of the master cylinder and into the servo unit, untill one day, BANG! no brakes. Other MGB V8 drivers have had the same experience. Luckily it happened at the end of my road and I was only doing about 15 mph. I was able to bring the car to a halt on the handbrake, then return home quickly to change my trousers!

From memory... and it was a looong time ago, it was the servo that was at fault and not the MC - but I could be wrong. On the MG the servo and the MC are on opposite sides of the car and both are easily accesible and hence readily changeable. On the TVR the two are bolted together - and we all know what the access is like! I would agree with previous post, while you have the whole lot apart, change both items.

How fed up will you be if you change one, bleed everything, then the other component fails a week later? These things tend to happen once everything has been disturbed, and you will be doing a fair amount of disturbing on this job. Good luck.

[Hedgehopper]

http://www.pistonheads.com/classifieds/parts-and-p...

Not often that you see these for sale.

[Else]

carsy said:

True but my money will be on the master cylinder leaking into the servo as Else predicts.

I bit the bullet on mine and did the whole thing. Pedal box out new servo and master cylinder. Job done, hopefully for a long time. Its not that bad just messy with brake fluid.

Off topic Else but what figures did that engine of yours eventually make.

Hi mate, didn't quite make my target 400bhp & 400lbs/ft, got to 373bhp & 395ft/lbs on Joolz dyno. My inlet manifold set up seems to be working well, the throttle bodies are too big though, no increase in power above approx 70% open so I might look to source some 65 or 70mm versions but not desperate to change it cos it drives so nicely. Pulls cleanly from 1000rpm right upto limiter.

Next I'm going to redesign the exhaust, make it less restrictive especially where it splits into 2 just before the silencer. Joolz thought that part was a poor design and could be improved. Not sure how I'm going to do it but would like to incorporate a motorised valve so that I can switch between quiet (silenced) and loud (straight through).

Got a couple of annoying oil leaks to try and cure on the engine but Rob is on it, prob leave it till the winter, they're not bad enough to worry about.

I would like to meet some of the other modified Chim/Griff owners one day to compare notes etc, are there any meets coming up?

Else

[Else]

Hedgehopper said:

http://www.pistonheads.com/classifieds/parts-and-p...

Not often that you see these for sale.

Thanks but they're more expensive than TVR Parts Ltd

Else

[Hedgehopper]

^^^^^^^^^^^^^^

Well spotted, hadn't seen these before. Have been unobtainable for some time.

http://tvr-parts.com/tvr-parts/part-details/tvr-j0...