Hi All
Hope someone can give me advice! I've one a fair amount of brake bleeding but never hit a snag like this.

I have an old series 2 Landy which we're saving from the junkheap - it has a Wolsley 6 cyl (circa '57) in and we've re-done radiator, new waterpump and other bits & bobs and she's running very nicely except the master cylinder croaked. So replaced that and took all 4 slaves off, redid their seals, and no matter how hard we try the brakes do not want to pressurise.

The clutch with new slave bled within 2min flat, but we've been around all 4 wheels 5 times and the pedal still bottoms out with the only pressure the master cylinder return spring.
Checked the Master cyl working fine and full of fluid, done the usual pumping with pipe on the nipple into a bottle of fluid etc etc, did get a lot of air out, but after about 6hours of (im)patient pumping gave up

Any tips, thoughts what it could be?

Ryan

 

If it's the older CB type MC (large nut on the end of the housing, it's often easier to get all the air out by raising the front enough so the MC is level.

What is the condition of the rubber flex lines? Have they been renewed? If not, they tend to swell internally and when you press the brakes all you're doing is compressing the rubber inside the lines, with little hydraulics going to the wheels.

 

It is the older MC, thanks, will try that

We've replaced all the brake lines with steel lines, except for a short section of about 30cm, but when I say there's no pressure, I mean there's nothing - bottoms out with ease, the only backpressure is the weak internal spring on the MC, so it can't be pipes swelling

Only things I can think of is massive airlocks in MC or more than one slave...

Ryan

 

fill the master cylinder,and crack open all the pipes that bolt on to the m/c.gently press the pedal and close the pipe nuts,crack them open after you have let the pedal up,do it again untill fluid comes out of the nuts,then shut then,go to the furthest away bleed nipple,open it/fit a small tube of hose,into a glass bottle containing about 2 inches of brake fluid, KEEP THE M/C RES FULL,GENTLY PRESS AND THE FLUID WILL DROPonly have each nipple 1/4 turn open at a time,when all the air has stopped.going into the bottle then shut that nipple,go to the one on the same axle and do the same,keep the fluid topped up,same thing,then go to the front one at the opposite side to the m/c and do the same,then the last one.and then you have a pedal,if you feel them soft but firm you just bleed the like normal,it is a lot easier with 3 people,one to top up,one to pump and one to bleed.if you still have a problem,get in touch ,hamishkeenan@btinternet.com