Still having IH 684 brake issues

StuartR

Member
Hi again all, since my last post, I have bypassed the equaliser valve on the advice of the knowledgable Bernard le mecano. Only different thing I did was rather than just replace the tee's for elbows, I made an equaliser manifold in the lathe so that the brakes are permanently equalised (as I have the pedals bolted together due to a worn pedal shaft and I figured that if the brakes were unequally worn I would get unbalanced braking without equalising the pressure in each service). Apart from a small leak on one pipe, I thought this would do the trick. However, after bleeding the brakes all was good, engine stopped for about 30 mins & still good, engine off & pedal remaining hard, left overnight and back to soft peal and pumping the brakes again!!!!!. I just don't know where to next, should I replace the seals in the master cylinders? even though there appears to be no leaks. I still don't think it's the wheel cylinder seals as when they work, they are perfect until the engine is stopped, if the wheel cylinder o rings were rolling, surely they would do this whether or not the engine was running?? It seems to be something that is affected on the engine start up, as sometimes I start up and all is well, other times it's not, I'm on the point of giving up!!! Please help..
 
Hi, you have a leak by the O ring on the brake piston. You have to remove the rear axle housing and change the 2 O ring on both side. Bernard in Québec Canada
 
I agree with Bernard, bite the bullet and replace O-rings. When you do make sure you use a lot of lube on o-rings to keep them from tearing.
 
I just can't understand why that would be intermittent. If the seals were leaking, would they not leak every time & all the time? I'm not doubting your expertise, I just need to understand why it's happening before I undertake a major strip down to change the wheel cylinder o rings.
Thanks.
 
I have never seen a complete blow out of the o-rings. After time they get worn and leak past into the transmission. so setting over night the oil leaks past the o-rings.
 
This is a common failure for this braking system ..replace the orings, takes 2 of each.

1536081C1
27658R1
27659R1

There is a T-bar with three 1/4" bolts used to help push the piston squarely into the housing
 
Hi John, I've only just seen your offer to give you a call. Thanks, I'm in the UK so could be an expensive call. I think I've sorted it, I bypassed the equaliser valve with a home made equaliser manifold, and I have no problems since. Thanks for the offer of help. Stuart
 

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