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[willo]

would the amp draw from the barke servo when foot is on pedal be enough to stall the car if the battery was a bit suspect?

[Panic mechanic!]

no.but you can stall an engine by repeatedly pumping the brake pedal very quickly.

or is the brake servo diaphram split so when you apply it its leaning the fuel out too much?

[willo]

or is the brake servo diaphram split so when you apply it its leaning the fuel out too much?

ok I may need a brief lesson in how they work

could the diaphram split if left stood for a while?

[isle of man]

If the diaphram is fooked the pedal would be on Prozac!!!

[Cockney Boy]

It could be either by a blockage of the vacuum hose or a cracked, ruptured or leaking diaphragm. Another is the master cylinder leaking brake fluid, either internally or externally from the cylinder boot. Stalling can also happen if there is a brake line obstruction, either by a chunk of rust or a pinched brake line. Air in the brake fluid from a hole in the system can prevent proper pressure to the brakes

[willo]

had a bit of an issue bleeding it today if thats any help

it did this stalling after braking at kov too

so what are the tests to proove or disproove stuff?

[Cockney Boy]

What was the problem with bleeding the brakes?

[willo]

What was the problem with bleeding the brakes?

well they still aren't bled properly but work enough to do, but anyhow we bled the brakes all round and yet i still have a squishy pedal, there was clear fluid at all 4 corners. I also have a line lock solenoid plumbed into the rear line before it tees off, which from memory is normally open.

with the line lock on I can feel the pedal firm up, but as soon as i switch it off the pedal nearly drops to the floor

[Cockney Boy]

I had exactly the same problem on my dads car last year. it turned out to be the servo, it looked ok but chnaged it for a new one and no more problem.

[Panic mechanic!]

 

[willo]

is the servo the mc?

[Lornaben]

is the servo the mc?

MC bolts to the servo. The servo is the big black canister between the bulkhead and MC with the vacuum pipe plumbed to it.

[willo]

Thanks. Every day is a school day 

[wildwood]

master Power brakes..... Big feck off servo from the Land of the septics....... Got one on the YJ turned an MOT failure on 35 s into  a good stopper ..

If ya come to CF..... Tis under my hood

[isle of man]

Had the same problem hydro boost was the answer,

[Delk]

A soft brake pedal is common on TJ's after you install large front brakes. You now require more fluid for your full sized calipers and this is nomally just on the edje for a stock MC.

Do a quick search on the Pirate and you should find details on other master cylinders with a slighly larger bore so they push more oil.

My pedal is quite soft but I am used to it. I have a new MC from Dodge truck I just dug out that will be going on when I get home.

[isle of man]

The Dodge Master Cylinder is useless have one here Gasser fitted for me gathering dust!!!

[wildwood]

some guys on Pirate have had success with the E250 MC........(is that a Dodge...? dunno?) but there you go.....

My MC on the Master power brakes is Kin huge and has same size res for both front and rear so discs not a prob....

HOWEVER!!!!! with the monster size of the 1 Ton fronts and 3/4 ton rears the pedal still goes half way down before locking as solid as a solid thing. would fail a MOT.....but those days are behind me

reckon Hydroboost as IOM said is the way forward...... Done right you could lock 40's on a dry road......Nice

[willo]

this is all a bit odd, the brakes bar the stalling were fine, then yesterday we replaced a brake line on the rear, and after trying to bleed it, i have had a squidgy pedal since.

I have an ssbc kit on the rear so may have uprated parts anyhoo??

[wildwood]

If ya got any other hydro stuff in the brake system open it up ....... blead brakes as normal then if poss blead the hand brake if hydro or line lock..... this is what `I had to do with my hydro handbrake on the 1 Ton could hear air coming out as cranked the handle...... then go back and blead again. as normal.......

Don't know if this is correct procedure but worked for me.

[Mike Pavelin]

This is a bit cofusing. Do you have a problem with engine stalling, brake performance or both?

If you think the brake servo is causing the engine to stall, disconnect the vacuum line at the engine, plug the manifold and see if it still stalls, be careful cos you won't have power brakes.

[willo]

Both!

[MOCAJ]

if your ssbc conversion has been done to the book you will have a larger master cylinder, its that big it virtually touches your airbox

and the innards will be stripped out of the proportioning valve given you equal braking fore and aft 

[willo]

airbox?

[MOCAJ]

only trying to help dood, can measure my m/c if it helps any