’84 Indy
4 cyl
4 speed

My clutch system seems to be slowly pressurizing itself. I notice the grab point creeping up until eventually the clutch will slip. I open the bleeder at the slave and get a spurt of fluid. When I open the bleeder I can see the rod move about 1.5 inches into the slave and then the grab point will be back to normal and again will start to creep up. I’ve only had the car for about 3000 miles and have done this pressure release procedure 3 times. The slave is new but the master is original. Do I need a new master too?

Thanks
Bryan

Perhaps the clutch pedal isn't returning fully?

I second a problem with the master. If the peddle returns all the way it sould release any pressure in the line. If it is returning all the way then the master is at fault.

When the master cylinder is fully in it's rest position, the bypass port allows pressure from the system to 'bypass' back to the master cylinder and return to the reservoir.



You need to correct the problem that is keeping the MC pushrod from fully returning. Is there an adjustable pushrod installed that is adjusted too long? Is something keeping the pedal from fully returning?

The pushrod isn’t adjustable. When the slave was seized I bent the pushrod at the pedal by pushing too hard. That was when I took everything apart and found the slave was the problem and replaced it. I was able to unbend the pushrod and everything seemed to work fine at the time. I may have unbend the pushrod in a way that has made it longer than it should be.

Thanks for the advice. I think I’ll start with an adjustable pushrod and go from there.

Bryan

You can just take out the stock MC pushrod and grind it down. Disconnect it from the pedal and figure out how much is needed to give you just a little slack.

My guess is you 'unbent' your clutch pedal a little to far. You could also adjust the clutch pedal, however it would be easier to grind down the push rod.

I don’t think the pushrod is too long. I disconnected it from the pedal and it didn’t seem to go any further out. I don’t have to push it in at all to get it back onto the pedal and the clutch’s grab point didn’t return the way it does when I let the extra pressure out at the bleeder.

Before I get a new maser I’ll take this one apart and see if cleaning it out helps anything.

Thanks
Bryan

The pushrod can’t “grow” in length. I’d guess that one of the rubber hoses in the system is internally coming apart and blocking return flow (or both of them). Spend a few minutes pumping the clutch pedal and then crack the line at the MC while having someone watch to see of the SC’s pushrod retracts. If it does then the problem is in the MC. If it doesn’t, then crack the bleeder and if it retracts then, replace the hoses. Unfortunately the rubber hoses aren’t replaceable separately. They are one piece from the MC all the way back to the SC.