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Has anyone come across this issue? I have brakes when the brumby is off but when I start it the pedal goes to the floor. Is it a split line or vacuum leak in the booster?

Sounds like the master cylinder could be the problem.

Is there a leak on the firewall behind the booster like in most older vehicles?

TOONGA

I have no visible leaks but I'm going to have a another good look tomorrow. 8 have a spare booster and master but it american so all the bleeds are on the lhs.

In normal operation when the engine is off the brake pedal will be firm. when the engine starts the pedal will drop a little and then be firm, this is the booster working.

If the pedal continues to drop, the system has a leak which is making the booster force the fluid through the leaks.

The booster won't be the problem the seals in the master cylinder or even the seals in the drum cylinders will be the problem.

Are the rear drums ok? before I went to discs on my brumby, the rear slaves were a real problem.

like this



and that was the good side.

Check your rear drums and front discs as well if there is no signs of leaks at the master cylinder.

TOONGA

I have 2 new drum cylinders in the shed. Tried removing the brake lines but they are pretty tight and feel like im going to round them off. I have a full rear disk set up sitting here too but i was waiting to do the rear bearings before I totally pull it apart to put them on. I'm going to have another crack to see if i can get it working if not ill have to find some hose fittings to attach new brake lines for the disk setup

All sorted! Had a huge amount of air in the rear left drum and a split vacuum hose. Now I can drive it again without fear of death.. �� thanks for the help. Will be throwing the disks on as soon as my ej22 is ready to put in