No brake pedal. Causing engine to die?

[gardner51]

Hi all. With the car idleing. I have no brake pedal. Just sinks. But if I pump quickly it gets firmer but causes engine to die? And afrs shoot to 16 then dies?

Any thoughts

Elliott

[gardner51]

This is how my piping is.

[Jonny5]

Brake Servo?
Start the car with the brake pedal pressed down an see if it goes down a bit further as soon as the engine starts.

[Junglist]

Tried the method in the Haynes manual to reset the servo.
Hope your servo hasn't died.

[TNT Tricky Nicky]

Sounds like the classic one way valve in the inlet manifold. Should be two, one goes to the brake servo. Take it out and give it a suck and blow, should only go one way, if both that's your problem

[gttjames]

was ok before, and you havnt replaced any of those pipes though have you ellz?

[Brigsy]

Sounds like the servo is working ok but the mastercylinder has failed or you have a leak. The engine will become upset if you rapidly press the pedal thats normal.

[gardner51]

Will give it ago tomorrow. Would this cause it to make the engine die?

[gardner51]

was ok before, and you havnt replaced any of those pipes though have you ellz?

Nope havnt touched any of them James?

[Brigsy]

Will give it ago tomorrow. Would this cause it to make the engine die?

Pumping the pedal can make the engine conk out. If the pedal is ****e though it will definitely be a fault with the brakes. If the servo wasnt working properly you should still have a pedal?

[gardner51]

Ok, yh it's solid then when it starts it just sinks. Then goes real soft. Will have a good look tomorrow and check the valve.

M.o.t on sat. Looks like ill have to re book

[Brigsy]

Ah might be a servo or one way valve fault - from what you had described it sounded like no brake pedal at all.

[gardner51]

With engine off. I have a firm brake pedal. Start it up then I have no brake pedal. Just sinks.


Hoping its this valve. And not a brake servo.

[gardner51]

Rite. Checked the one way valve on manifold. And that only allows air one way,

Can someone tell me why when I push the brake pedal it makes the afr shoot up?

Like its pushing air into the carb/engine?


Elliott

[gardner51]

If I pump quick. The pedal becomes harder. Then if I leave it pressed down. I can feel it slowly sinking.

[gardner51]

Found it. Pushed car out and noticed a nice puddle on the floor of brake fluid :@. Brake line split.

Doh

[Red October]

Hahaha ellz what a pisser, it always the thing that stares you in the face thats the problem sods law.

[gardner51]

Mate don't. So annoying! I havnt been anywhere near the rear of the car or touched the brakes so wouldn't of even thought about it.

Oh well. Best get them changed lol

[gttjames]

least youv found it mate, get them rusty brake pipes sorted.

also if need be ellz - contact this guy and he could just make you up a section you need as you don't have the tools to make them up

http://www.ebay.co.uk/itm/RENAULT-5-...item3a7b28f762

ps - maybe that brake fluid etc I gave you will come in handy now

[gardner51]

Yh gonna get them done mate. Bit worries about the rest of the pipes now. Just gotta bits the bullet and get them all done.

[Brigsy]

Id change the m/c aswell mate its pretty cheap. Thought it would be a leak

[gardner51]

I have changed the two pipes that go from master cylinder to rear brake valve, also changed one that goes from calliper to my braided hose,

Unfortunately one bleed nipple was already snapped off. And I snapped the other.

So I have managed to get fluid out if the 10mm that goes into the calliper.

Brake pedal is rear firm when engine is off. How it should be.

But as soon as engine has started it just sinks and is the same as first post


Back to square one again :@

Elliott

[Alastair]

Sounds like the classic one way valve in the inlet manifold. Should be two, one goes to the brake servo. Take it out and give it a suck and blow, should only go one way, if both that's your problem

Have you changed them both? I would, they are pennies from Mike.

Also bleeding from the flexi is a bad idea, get a second hand calliper or recon one asap

[gardner51]

Need both callipers then

Also I only checked the one way valve on back of mani. And that was fine. I shall try n check the other end see how hat is.
Elliott

[Brigsy]

As al said you will struggle to bleed via the flexi hose mate, the system will still have air in. The calipers will probably go again if you drill the nipples out carefully?

[gardner51]

Yh I'm bleeding after the flexi bit. But still prob have some air in calliper?

I'm going to try bleed fronts. If no joy then servo?

Elliott

[Alastair]

Yh I'm bleeding after the flexi bit. But still prob have some air in calliper?

I'm going to try bleed fronts. If no joy then servo?

Elliott

I'd put money on the one way valves, change them both first as they stick and gum up, testing them doesn't really work and they are pennies new.

Then change calipers ASAP.

Only then consider the M/C, or servo.

[gardner51]

Anyone got the 2 one way valves for sale?

Elliott