breaks again i give up

[staningrimsby]

Good luck Stephen hope it goes well,

and keep us updated.[:D]



1980 2.0 DHC (soon to be 16v) - Polly.

[rocky_679]

well i can honestly say if this dont work theres a sledge hammer with her name on it waitin to be beaten n bashed into submission [:D]

stephen j dark

[Jolyon39]

Check those flexible hoses..... they are way cheaper than a new Master Cylinder

Jolyon

[John Clancy]

Is it possible to put the valve in the inlet manifold in the wrong way around? I haven't had it out for years but I recall someone mentioning that as a possiblity for a seemingly faulty servo recently.

Good luck with the new master cylinder. If all this fails look for a mobile mechanic in your area, that will get it sorted and probably quite painlessly too.

<center><b>[url="http://www.triumphtr7.com/documents/sales/codenamebullet.asp"]Buy the story of the Triumph TR7/8 on DVD here[/url]</b></center>

[rocky_679]

all hoses r brand new [:(] an have tried 3 servos all same problem [B)]

stephen j dark

[Hasbeen]

Hold on there Stephen, she giving you a rough ride right now, but you'll get there.

That test virtually proves it's the master cylinder.

Did you try stamping on the peddle, engine off, to see if you could get it to fail? That would definitely confirm the problem.

Hope the new master cylinder gets you on top of it.

Hasbeen

[rocky_679]

fitted new master cylinder still the same [:(!] problem so goin to lock up garage n 1 day go back to it give or take a yr or 2 grrrrrr

stephen j dark

[Shauniedawn]

Hiya Steve.

You certainly have had a fight on your hands with this.

Going back to our previous conversations...did you try isolating the master cyclinder to eliminate/find the cause?

I'd still suggest disconnecting it from the system, making up a couple of pipes with bleed nipples on the end, and then bleeding the 'system' that is essentially just the resevoir, the master cylinder and the couple of lengths of pipe.

If the problem still persists, then you've found the root cause. If you haven't, then move onto adding one (and only one) component in at a time.

It certainly sounds like the master cylinder this time, but I'm not so sure on the previous issues. The trouble is, as you've now changed so much (everything!!!) then finding the actual issue is a bit of a game of chase.

I'd certainly try testing your three other master cylinders as described above before you fit the new one. That way at least you can return the new one unused if this isn't the fault.

I know we all have everything crossed for you and your Dad here. Good luck, and hang on in there mate.

Shaun

[rocky_679]

to be honest i given up goin to giv it to som1 else carnt be arsed to do it myself [:D] let some one els have the hassle

stephen j dark

[FI Spyder]

Stephen, at this point it's probably time for a fresh set of eyes. As I stated before and Hasbeen and Shauniedawn agreed it sounds like it could only be master cylinder from the description of what was happening. That assumes everything else is hooked up right. I don't know what that could be but best let someone start from scratch and go over it as at this point it's not seeing the forest for the trees situation.

Other than that Shaunie's logical step by step of starting with basic "system" and adding components as you test would also be a smart move.
That's how I found my expanding brand new clutch hose problem.


TR7 Spider - 1978 Spitfire - 1976 Spitfire - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT

[Shauniedawn]

Probably the best course of action, to save your sanity if nothing else.

The other thing we're all overlooking here are the rear automatic adjusters. These combined with say swelling hoses or something else could mean when the system has the full line pressure of the servo this allows fluid to move into these 'spaces' giving the long pedal. I'm not explaining myself too well here!

However, as Hasbeen suggested, rapid pumping of the pedal is likely to get you some pedal. As F1 said earlier though, it's made more difficult diagnosing this via a pc.

The fluid is certainly going somewhere though.

Think you should go and get lashed tonight [;)]

Shaun

[rocky_679]

hav had a mechanic look at it he says he needs a picture of the layout of the engine as to where the pipes go i.e breather pipes n lines from master cylinder he reckons the breather pipe from manifold to the servo the air should be forced into the servo,,,, but on the tr7 its sucking air into themanifold from servo any ideas guys so if i could have som pics please that would help me a great deal[:)]

stephen j dark

[rocky_679]

have just checked rear brakes when applying foot pedal the rear brakes are not holding even when applying hand brake nothings holding on the rear [:(] however the front are holding when applying foot pedal when engine is switched off....now have fitted new shoes new hose an new wheel cylinders to rear brakes....even with new master cylinder we even changed the compensater at the front am realy stuck here

stephen j dark

[FI Spyder]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Shauniedawn</i>


The other thing we're all overlooking here are the rear automatic adjusters. These combined with say swelling hoses or something else could mean when the system has the full line pressure of the servo this allows fluid to move into these 'spaces' giving the long pedal.
Think you should go and get lashed tonight [;)]
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

I've thought of the auto adjusters slipping out of position if they weren't seated well but would think that would be a one time thing, not a repeat thing. But yes, the fluid is going somewhere.

By all means get lashed tonight...but if you're not into S&M getting drunk will work too.[:D]


TR7 Spider - 1978 Spitfire - 1976 Spitfire - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - Yellow TCT

[Shauniedawn]

Hiya.

Not wishing to sound rude Steve - but if your mechanic doesn't understand the basic working of a servo...and if what you said he said was right, then that's the complete opposite of how it works. The depression in the inlet manifold causes a suction (vacuum) which, in very simple terms draws the air out of the servo, the one way valves keeping it that way.

Looks like you've found your problem though - excellent news.

To confirm this I'd disconnect the flexi from the long solid brake pipe at the rear axle. And put a bleed nipple in the end of the pipe. THis way you can bleed the sysyem and the rear brakes and flexi will be completely disconnected. Now when you start the engine see if the pedal stays hard. From what you've said, it should.

Basically it looks to me like you've got something assembled not quite right. Hence why the handbrake doesn't work either (this is purely mechanical so bleeding the brakes makes no difference to this).

If you do disconnect the line like I described above and it's ok, next add in the flexi and repeat. Then one brake cylinder, remove the crossover pipe and replace with a bleed nipple to test that one etc.

All being well you should have this all sorted tomorrow (if you get the chance to work on it), but go careful if your wounds and head are still sore from tonights S&M and boozing session!



Shaun